TECHNICAL FIELD

Embodiments of the disclosure are in the field of advanced integrated circuit (IC) structure fabrication and, in particular, to enhanced heat transfer structures in ICs.

BACKGROUND

For the past several decades, the scaling of features in integrated circuits has been a driving force behind an ever-growing semiconductor industry. Scaling to smaller and smaller features enables increased densities of functional units on the limited real estate of semiconductor chips. For example, shrinking transistor size allows for the incorporation of an increased number of memory or logic devices on a chip, lending to the fabrication of products with increased capacity. The drive for ever-more capacity, however, is not without issue. The necessity to optimize the performance of each device becomes increasingly significant.

In some devices, for example, transistors with metal on both front and back sides are utilized to help increase transistor density. Such transistors separate signal and power delivery on two different sides of the transistor, which helps in reducing die size and in improving circuit performance. However, such transistors are located away from the silicon (a carrier wafer in this case) and the heat transfer path to this carrier wafer is also resisted (isolated) by a passivation layer. Thus, transistors with metal-on-both-sides may run hotter than other transistors. This may lead to regional hotspots as well as raising the global temperature of a device. Embodiments of the present disclosure address these and other issues.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view of an integrated circuit (IC) structure, in accordance with various embodiments of the present disclosure.

FIG. 2 illustrates an example of a computing device in accordance with various embodiments of the disclosure.

FIG. 3 illustrates an example of an interposer that includes one or more embodiments of the disclosure.

DESCRIPTION OF THE EMBODIMENTS

In some embodiments, integrated circuits (ICs) with enhanced heat transfer structures are described. In the following description, numerous specific details are set forth, such as specific integration and material regimes, in order to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to one skilled in the art that embodiments of the present disclosure may be practiced without these specific details. In other instances, well-known features, such as integrated circuit design layouts, are not described in detail in order to not unnecessarily obscure embodiments of the present disclosure. Furthermore, it is to be appreciated that the various embodiments shown in the Figures are illustrative representations and are not necessarily drawn to scale.

The following detailed description is merely illustrative in nature and is not intended to limit the embodiments of the subject matter or the application and uses of such embodiments. As used herein, the word “exemplary” means “serving as an example, instance, or illustration.” Any implementation described herein as exemplary is not necessarily to be construed as preferred or advantageous over other implementations. Furthermore, there is no intention to be bound by any expressed or implied theory presented in the preceding technical field, background, brief summary or the following detailed description.

This specification includes references to “one embodiment” or “an embodiment.” The appearances of the phrases “in one embodiment” or “in an embodiment” do not necessarily refer to the same embodiment. Particular features, structures, or characteristics may be combined in any suitable manner consistent with this disclosure.

Terminology. The following paragraphs provide definitions or context for terms found in this disclosure (including the appended claims):

“Comprising.” This term is open-ended. As used in the appended claims, this term does not foreclose additional structure or operations.

“Configured To.” Various units or components may be described or claimed as “configured to” perform a task or tasks. In such contexts, “configured to” is used to connote structure by indicating that the units or components include structure that performs those task or tasks during operation. As such, the unit or component can be said to be configured to perform the task even when the specified unit or component is not currently operational (e.g., is not on or active). Reciting that a unit or circuit or component is “configured to” perform one or more tasks is expressly intended not to invoke 35 U.S.C. § 112, sixth paragraph, for that unit or component.

“First,” “Second,” etc. As used herein, these terms are used as labels for nouns that they precede, and do not imply any type of ordering (e.g., spatial, temporal, logical, etc.).

“Coupled”—The following description refers to elements or nodes or features being “coupled” together. As used herein, unless expressly stated otherwise, “coupled” means that one element or node or feature is directly or indirectly joined to (or directly or indirectly communicates with) another element or node or feature, and not necessarily mechanically.

In addition, certain terminology may also be used in the following description for the purpose of reference only, and thus are not intended to be limiting. For example, terms such as “upper”, “lower”, “above”, and “below” refer to directions in the drawings to which reference is made. Terms such as “front”, “back”, “rear”, “side”, “outboard”, and “inboard” describe the orientation or location or both of portions of the component within a consistent but arbitrary frame of reference which is made clear by reference to the text and the associated drawings describing the component under discussion. Such terminology may include the words specifically mentioned above, derivatives thereof, and words of similar import.

“Inhibit”—As used herein, inhibit is used to describe a reducing or minimizing effect. When a component or feature is described as inhibiting an action, motion, or condition it may completely prevent the result or outcome or future state completely. Additionally, “inhibit” can also refer to a reduction or lessening of the outcome, performance, or effect which might otherwise occur. Accordingly, when a component, element, or feature is referred to as inhibiting a result or state, it need not completely prevent or eliminate the result or state.

Embodiments described herein may be directed to front-end-of-line (FEOL) semiconductor processing and structures. FEOL is the first portion of integrated circuit (IC) fabrication where the individual devices (e.g., transistors, capacitors, resistors, etc.) are patterned in the semiconductor substrate or layer. FEOL generally covers everything up to (but not including) the deposition of metal interconnect layers. Following the last FEOL operation, the result is typically a wafer with isolated transistors (e.g., without any wires).

Embodiments described herein may be directed to back-end-of-line (BEOL) semiconductor processing and structures. BEOL is the second portion of IC fabrication where the individual devices (e.g., transistors, capacitors, resistors, etc.) get interconnected with wiring on the wafer, e.g., the metallization layer or layers. BEOL includes contacts, insulating layers (dielectrics), metal levels, and bonding sites for chip-to-package connections. In the BEOL part of the fabrication stage contacts (pads), interconnect wires, vias and dielectric structures are formed. For modern IC processes, more than 10 metal layers may be added in the BEOL.

Embodiments described below may be applicable to FEOL processing and structures, BEOL processing and structures, or both FEOL and BEOL processing and structures. In particular, although an exemplary processing scheme may be illustrated using a FEOL processing scenario, such approaches may also be applicable to BEOL processing. Likewise, although an exemplary processing scheme may be illustrated using a BEOL processing scenario, such approaches may also be applicable to FEOL processing.

One or more embodiments may be implemented to realize a 3D ferroelectric RAM (FRAM, FeRAM, or F-RAM) to potentially increase monolithic integration of backend logic plus memory in SoCs of future technology nodes. To provide context, a FRAM is a random-access memory similar in construction to DRAM but uses a ferroelectric layer instead of a dielectric layer to achieve non-volatility. Conventionally, both FRAM and DRAM are one transistor (1T)/one capacitor (1C) cell arrays, where each cell comprises an access transistor in the front end coupled to a single capacitor. The capacitor may be coupled to a bitline (COB) higher in the stack in the semiconductor back end.

As introduced above, transistors with metal on both sides may run hotter than other types of transistors, leading to regional hotspots and an increase in the global temperature of a device. One solution to address this issue includes drilling a through-silicon via (TSV) from the transistor's back side. However, as TSVs come with a moisture hermetic guard-ring as a collateral, spatially they will be at least couple of microns away from the hotspot, and the TSV mid process can only connect to the hotspot from the transistor back-side. To be an effective heat conduit, structures need to be within about 100nm (the closer the structure can come without shorting, the better), and TSVs typically cannot be formed within this distance. Thus, TSVs do not provide a good heat conduit to the silicon. Embodiments of the present disclosure, by contrast, can provide metal lines for heat transfer relatively close to potential hotspots, as described in more detail below.

FIG. 1 is a cross-section of an IC structure in accordance with various embodiments. In this example, the IC structure 100 includes transistor having a metal line structure for power transfer 105 coupled to a passivation layer 110. The metal line structure for power transfer 105 is coupled to a set of front-to-back connectors 115. The metal line structure for power transfer 105 and passivation layer 110 are included in a back side portion of the transistor (above the front-to-back connectors 115).

IC structure 100 further includes a bonded carrier 145, a second passivation layer 130, and a permanent bonding layer 135 between the bonded carrier 145 and the passivation layer 130. A metal line structure for heat transfer 125 is coupled to the bonded carrier 145 and extends through the bonding layer 135 and second passivation layer 130 within a front side portion of the transistor (above the front-to-back connectors 115).

In some embodiments, the metal line structure for heat transfer 125 and the metal line structure for power delivery 105 each comprise copper. In alternate embodiments, metal line structures 125, 105 may include any suitable metal or combination of metals. In some embodiments, the metal line structure for heat transfer 125 includes between ten and twenty-five layers and has a thickness of between about Sum to about 25um. In some embodiments, the metal line structure for power delivery transfer 105 includes between three and six layers and has a thickness of between about 10 um to about 20 um. Additionally, the metal line structure for power delivery 105 may be coupled to a solder bump (e.g., extending above passivation layer 110 in FIG. 1) having a thickness of between about 10 um to about 15 um.

As shown in FIG. 1 and introduced above, a transistor with metal on both front and back side portions may experience a hot spot in region 118. Conventional transistor devices with metal on both sides typically cannot dissipate heat from such hot spots to the bonded carrier silicon wafer 145 due to the relatively large distance between the bonded carrier wafer 145 to the hotspot region 118, and also due to the passivation layer 130 further isolating the hotspot region 118 from the bonded carrier 145.

However, in embodiments of the present disclosure, as shown in FIG. 1, the metal line structure for heat transfer 125 creates a process flow to directly link the silicon bonded carrier 145 to the hotspot region 118. The metal line structure for heat transfer 125 extends a metal path through the bonding layer 135 and passivation layer 130 directly to trench contact layer 120 directly adjacent the hotspot region 118, thus allowing the heat in hotspot region 118 to quickly dissipate through the metal line structure 125 to silicon bonded carrier wafer 145. This not only helps reduce the heat in the hotspot region 118 itself, but also mitigates global heat buildup in the device.

Internal connections to the hotspot region 118 in the front side can be manufactured along with the front side processing. Additionally, this may include a trench through the passivation layer 130 (on the top metal in the front-side of the transistor) and a metal pad flash to the bonding ILD layer. A mating pad (mirrored) may be patterned on the bonded carrier wafer 145. After the wafers are bonded by Vander Waals force, a high temperature anneal can bond these metal pads together to complete the link between the hotspot region 118 to the bonded carrier wafer 145.

Embodiments of the present disclosure may utilize a metal line structure for heat transfer 125 of any suitable size, shape, and configuration to provide the heat transfer capability to the bonded carrier wafer 145. In some embodiments, for example, the metal line structure for heat transfer 125 may be configured to cool hotspot temperatures in a range of about 125C to about 160C.

The metal line structure for heat transfer 125 may not necessarily have the same thickness, shape, or configuration throughout. For example, as illustrated in FIG. 1, the metal line structure for heat transfer 125 may be formed from two pieces, upper portion 126 that couples to the trench contact layer 120 and a lower portion 140 coupled to bonded carrier wafer 145 and extending through the permanent bonding layer 135 and passivation layer 130 in the structure.

The portion 126 of the metal line structure for heat transfer 125 closest to the hotspot region 118 may be constructed to be more robust relative to portion 140 to withstand the maximum temperature from hotspot region 118. Accordingly, the upper portion 126 of metal line structure for heat transfer 125 may have additional metal volume (to avoid melting) relative to the lower portion 140. In some embodiments, the upper portion 126 of the metal line structure for heat transfer 125 may include a circular area adjacent to hotspot region 118 of between about 1 um to about 2 um that is completely filled with metal.

The second portion of metal line structure for heat transfer 125 (portion 140) is the metallic connection through the permanent bonding/glue layer 135 (oxide in this case, such as SiOx or SiCN). In some embodiments, this portion may have a metal density of between about 20% to about 30%.

Implementations of embodiments of the invention may be formed or carried out on a substrate, such as a semiconductor substrate. In one implementation, the semiconductor substrate may be a crystalline substrate formed using a bulk silicon or a silicon-on-insulator substructure. In other implementations, the semiconductor substrate may be formed using alternate materials, which may or may not be combined with silicon, that include but are not limited to germanium, indium antimonide, lead telluride, indium arsenide, indium phosphide, gallium arsenide, indium gallium arsenide, gallium antimonide, or other combinations of group III-V or group IV materials. Although a few examples of materials from which the substrate may be formed are described here, any material that may serve as a foundation upon which a semiconductor device may be built falls within the spirit and scope of the present invention.

A plurality of transistors, such as metal-oxide-semiconductor field-effect transistors (MOSFET or simply MOS transistors), may be fabricated on the substrate. In various implementations of the invention, the MOS transistors may be planar transistors, nonplanar transistors, or a combination of both. Nonplanar transistors include FinFET transistors such as double-gate transistors and tri-gate transistors, and wrap-around or all-around gate transistors such as nanoribbon and nanowire transistors. Although the implementations described herein may illustrate only planar transistors, it should be noted that the invention may also be carried out using nonplanar transistors.

Each MOS transistor includes a gate stack formed of at least two layers, a gate dielectric layer and a gate electrode layer. The gate dielectric layer may include one layer or a stack of layers. The one or more layers may include silicon oxide, silicon dioxide (SiO₂) and/or a high-k dielectric material. The high-k dielectric material may include elements such as hafnium, silicon, oxygen, titanium, tantalum, lanthanum, aluminum, zirconium, barium, strontium, yttrium, lead, scandium, niobium, and zinc. Examples of high-k materials that may be used in the gate dielectric layer include, but are not limited to, hafnium oxide, hafnium silicon oxide, lanthanum oxide, lanthanum aluminum oxide, zirconium oxide, zirconium silicon oxide, tantalum oxide, titanium oxide, barium strontium titanium oxide, barium titanium oxide, strontium titanium oxide, yttrium oxide, aluminum oxide, lead scandium tantalum oxide, and lead zinc niobate. In some embodiments, an annealing process may be carried out on the gate dielectric layer to improve its quality when a high-k material is used.

The gate electrode layer is formed on the gate dielectric layer and may consist of at least one P-type workfunction metal or N-type workfunction metal, depending on whether the transistor is to be a PMOS or an NMOS transistor. In some implementations, the gate electrode layer may consist of a stack of two or more metal layers, where one or more metal layers are workfunction metal layers and at least one metal layer is a fill metal layer.

For a PMOS transistor, metals that may be used for the gate electrode include, but are not limited to, ruthenium, palladium, platinum, cobalt, nickel, and conductive metal oxides, e.g., ruthenium oxide. A P-type metal layer will enable the formation of a PMOS gate electrode with a workfunction that is between about 4.9 eV and about 5.2 eV. For an NMOS transistor, metals that may be used for the gate electrode include, but are not limited to, hafnium, zirconium, titanium, tantalum, aluminum, alloys of these metals, and carbides of these metals such as hafnium carbide, zirconium carbide, titanium carbide, tantalum carbide, and aluminum carbide. An N-type metal layer will enable the formation of an NMOS gate electrode with a workfunction that is between about 3.9 eV and about 4.2 eV.

In some implementations, the gate electrode may consist of a “U”-shaped structure that includes a bottom portion substantially parallel to the surface of the substrate and two sidewall portions that are substantially perpendicular to the top surface of the substrate. In another implementation, at least one of the metal layers that form the gate electrode may simply be a planar layer that is substantially parallel to the top surface of the substrate and does not include sidewall portions substantially perpendicular to the top surface of the substrate. In further implementations of the invention, the gate electrode may consist of a combination of U-shaped structures and planar, non-U-shaped structures. For example, the gate electrode may consist of one or more U-shaped metal layers formed atop one or more planar, non-U-shaped layers.

In some implementations of the invention, a pair of sidewall spacers may be formed on opposing sides of the gate stack that bracket the gate stack. The sidewall spacers may be formed from a material such as silicon nitride, silicon oxide, silicon carbide, silicon nitride doped with carbon, and silicon oxynitride. Processes for forming sidewall spacers are well known in the art and generally include deposition and etching process steps. In an alternate implementation, a plurality of spacer pairs may be used, for instance, two pairs, three pairs, or four pairs of sidewall spacers may be formed on opposing sides of the gate stack.

As is well known in the art, source and drain regions are formed within the substrate adjacent to the gate stack of each MOS transistor. The source and drain regions are generally formed using either an implantation/diffusion process or an etching/deposition process. In the former process, dopants such as boron, aluminum, antimony, phosphorous, or arsenic may be ion-implanted into the substrate to form the source and drain regions. An annealing process that activates the dopants and causes them to diffuse further into the substrate typically follows the ion implantation process. In the latter process, the substrate may first be etched to form recesses at the locations of the source and drain regions. An epitaxial deposition process may then be carried out to fill the recesses with material that is used to fabricate the source and drain regions. In some implementations, the source and drain regions may be fabricated using a silicon alloy such as silicon germanium or silicon carbide. In some implementations the epitaxially deposited silicon alloy may be doped in situ with dopants such as boron, arsenic, or phosphorous. In further embodiments, the source and drain regions may be formed using one or more alternate semiconductor materials such as germanium or a group III-V material or alloy. And in further embodiments, one or more layers of metal and/or metal alloys may be used to form the source and drain regions.

One or more interlayer dielectrics (ILD) are deposited over the MOS transistors. The ILD layers may be formed using dielectric materials known for their applicability in integrated circuit structures, such as low-k dielectric materials. Examples of dielectric materials that may be used include, but are not limited to, silicon dioxide (SiO2), carbon doped oxide (CDO), silicon nitride, organic polymers such as perfluorocyclobutane or polytetrafluoroethylene, fluorosilicate glass (FSG), and organosilicates such as silsesquioxane, siloxane, or organosilicate glass. The ILD layers may include pores or air gaps to further reduce their dielectric constant.

FIG. 2 illustrates a computing device 200 in accordance with one implementation of the invention. The computing device 200 houses a board 202. The board 202 may include a number of components, including but not limited to a processor 204 and at least one communication chip 206. The processor 204 is physically and electrically coupled to the board 202. In some implementations the at least one communication chip 206 is also physically and electrically coupled to the board 202. In further implementations, the communication chip 206 is part of the processor 204.

Depending on its applications, computing device 200 may include other components that may or may not be physically and electrically coupled to the board 202. These other components include, but are not limited to, volatile memory (e.g., DRAM), non-volatile memory (e.g., ROM), flash memory, a graphics processor, a digital signal processor, a crypto processor, a chipset, an antenna, a display, a touchscreen display, a touchscreen controller, a battery, an audio codec, a video codec, a power amplifier, a global positioning system (GPS) device, a compass, an accelerometer, a gyroscope, a speaker, a camera, and a mass storage device (such as hard disk drive, compact disk (CD), digital versatile disk (DVD), and so forth).

The communication chip 206 enables wireless communications for the transfer of data to and from the computing device 200. The term “wireless” and its derivatives may be used to describe circuits, devices, systems, methods, techniques, communications channels, etc., that may communicate data through the use of modulated electromagnetic radiation through a non-solid medium. The term does not imply that the associated devices do not contain any wires, although in some embodiments they might not. The communication chip 206 may implement any of a number of wireless standards or protocols, including but not limited to Wi-Fi (IEEE 802.11 family), WiMAX (IEEE 802.16 family), IEEE 802.20, long term evolution (LTE), Ev-DO, HSPA+, HSDPA+, HSUPA+, EDGE, GSM, GPRS, CDMA, TDMA, DECT, Bluetooth, derivatives thereof, as well as any other wireless protocols that are designated as 3G, 4G, 5G, and beyond. The computing device 200 may include a plurality of communication chips 206. For instance, a first communication chip 206 may be dedicated to shorter range wireless communications such as Wi-Fi and Bluetooth and a second communication chip 206 may be dedicated to longer range wireless communications such as GPS, EDGE, GPRS, CDMA, WiMAX, LTE, Ev-DO, and others.

The processor 204 of the computing device 200 includes an integrated circuit die packaged within the processor 204. In some implementations of the invention, the integrated circuit die of the processor includes one or more devices, such as MOS-FET transistors built in accordance with implementations of the invention. The term “processor” may refer to any device or portion of a device that processes electronic data from registers and/or memory to transform that electronic data into other electronic data that may be stored in registers and/or memory.

The communication chip 206 also includes an integrated circuit die packaged within the communication chip 206. In accordance with another implementation of the invention, the integrated circuit die of the communication chip includes one or more devices, such as MOS-FET transistors built in accordance with implementations of the invention.

In further implementations, another component housed within the computing device 200 may contain an integrated circuit die that includes one or more devices, such as MOS-FET transistors built in accordance with implementations of the invention.

In various implementations, the computing device 200 may be a laptop, a netbook, a notebook, an ultrabook, a smartphone, a tablet, a personal digital assistant (PDA), an ultra-mobile PC, a mobile phone, a desktop computer, a server, a printer, a scanner, a monitor, a set-top box, an entertainment control unit, a digital camera, a portable music player, or a digital video recorder. In further implementations, the computing device 200 may be any other electronic device that processes data.

FIG. 3 illustrates an interposer 300 that includes one or more embodiments of the invention. The interposer 300 is an intervening substrate used to bridge a first substrate 302 to a second substrate 304. The first substrate 302 may be, for instance, an integrated circuit die. The second substrate 304 may be, for instance, a memory module, a computer motherboard, or another integrated circuit die. Generally, the purpose of an interposer 300 is to spread a connection to a wider pitch or to reroute a connection to a different connection. For example, an interposer 300 may couple an integrated circuit die to a ball grid array (BGA) 306 that can subsequently be coupled to the second substrate 304. In some embodiments, the first and second substrates 302/304 are attached to opposing sides of the interposer 300. In other embodiments, the first and second substrates 302/304 are attached to the same side of the interposer 300. And in further embodiments, three or more substrates are interconnected by way of the interposer 300.

The interposer 300 may be formed of an epoxy resin, a fiberglass-reinforced epoxy resin, a ceramic material, or a polymer material such as polyimide. In further implementations, the interposer 300 may be formed of alternate rigid or flexible materials that may include the same materials described above for use in a semiconductor substrate, such as silicon, germanium, and other group III-V and group IV materials.

The interposer 300 may include metal interconnects 308 and vias 310, including but not limited to through-silicon vias (TSVs) 312. The interposer 300 may further include embedded devices 314, including both passive and active devices. Such devices include, but are not limited to, capacitors, decoupling capacitors, resistors, inductors, fuses, diodes, transformers, sensors, and electrostatic discharge (ESD) devices. More complex devices such as radio-frequency (RF) devices, power amplifiers, power management devices, antennas, arrays, sensors, and MEMS devices may also be formed on the interposer 300. In accordance with embodiments of the invention, apparatuses or processes disclosed herein may be used in the fabrication of interposer 300.

Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the present disclosure, even where only a single embodiment is described with respect to a particular feature. Examples of features provided in the disclosure are intended to be illustrative rather than restrictive unless stated otherwise. The above description is intended to cover such alternatives, modifications, and equivalents as would be apparent to a person skilled in the art having the benefit of the present disclosure.

The scope of the present disclosure includes any feature or combination of features disclosed herein (either explicitly or implicitly), or any generalization thereof, whether or not it mitigates any or all of the problems addressed herein. Accordingly, new claims may be formulated during prosecution of the present application (or an application claiming priority thereto) to any such combination of features. In particular, with reference to the appended claims, features from dependent claims may be combined with those of the independent claims and features from respective independent claims may be combined in any appropriate manner and not merely in the specific combinations enumerated in the appended claims.

The following examples pertain to further embodiments. The various features of the different embodiments may be variously combined with some features included and others excluded to suit a variety of different applications.

Example embodiment 1 includes an integrated circuit structure, comprising: a bonded carrier; a passivation layer; a bonding layer between the bonded carrier and the passivation layer; and a metal line structure for heat transfer coupled to the bonded carrier and extending through the bonding layer and passivation layer.

Example embodiment 2 includes the integrated circuit structure of example embodiment 1 or some other example herein, wherein the integrated circuit structure comprises a transistor having a front side portion that includes at least a portion of the metal line structure for heat transfer.

Example embodiment 3 includes the integrated circuit structure of example embodiment 2 or some other example herein, wherein the metal line structure for heat transfer has a first end coupled to the bonded carrier and a second end, opposite the first end, that is coupled to a trench contact layer within the front side portion of the transistor.

Example embodiment 4 includes the integrated circuit structure of example embodiment 3 or some other example herein, wherein the transistor further includes a back side portion that includes a metal line structure for power delivery.

Example embodiment 5 includes the integrated circuit structure of example embodiment 4 or some other example herein, further comprising a set of front-to-back connectors between the front side portion of the transistor and the back side portion of the transistor, wherein the set of front-to-back connectors are coupled to the trench contact layer and the metal line structure for power delivery.

Example embodiment 6 includes the integrated circuit structure of example embodiment 4 or some other example herein, wherein the passivation layer is a first passivation layer, and the back side portion of the transistor further includes a second passivation layer coupled to the metal line structure for power delivery.

Example embodiment 7 includes the integrated circuit structure of example embodiment 1 or some other example herein, wherein the metal line structure for heat transfer and the metal line structure for power delivery each comprise copper.

Example embodiment 8 includes the integrated circuit structure of example embodiment 1 or some other example herein, wherein the metal line structure for heat transfer includes between ten and twenty-five layers.

Example embodiment 9 includes the integrated circuit structure of example embodiment 1 or some other example herein, wherein the metal line structure for heat transfer has a thickness of between about 5 um to about 25 um.

Example embodiment 10 includes the integrated circuit structure of example embodiment 1 or some other example herein, wherein the metal line structure for power delivery transfer includes between three and six layers.

Example embodiment 11 includes the integrated circuit structure of example embodiment 1 or some other example herein, wherein the metal line structure for power delivery has a thickness of between about 10 um to about 20 um.

Example embodiment 12 includes the integrated circuit structure of example embodiment 1 or some other example herein, wherein the metal line structure for power delivery is coupled to a solder bump.

Example embodiment 13 includes the integrated circuit structure of example embodiment 12 or some other example herein, wherein the solder bump has a thickness of between about 10 um to about 15 um.

Example embodiment 14 includes an integrated circuit structure, comprising: a transistor that includes: a front side portion that includes at least a portion of the metal line structure for heat transfer; a bonded carrier coupled to the metal line structure for heat transfer; a first passivation layer; a bonding layer between the bonded carrier and the first passivation layer, wherein the metal line structure for heat transfer extends through the bonding layer and first passivation layer; and a back side portion that includes a metal line structure for power delivery coupled to a second passivation layer.

Example embodiment 15 includes the integrated circuit structure of example embodiment 14 or some other example herein, wherein the metal line structure for heat transfer has a first end coupled to the bonded carrier and a second end, opposite the first end, that is coupled to a trench contact layer within the front side portion of the transistor.

Example embodiment 16 includes the integrated circuit structure of example embodiment 15 or some other example herein, further comprising a set of front-to-back connectors between the front side portion of the transistor and the back side portion of the transistor, wherein the set of front-to-back connectors are coupled to the trench contact layer and the metal line structure for power delivery.

Example embodiment 17 includes the integrated circuit structure of example embodiment 14 or some other example herein, wherein the metal line structure for heat transfer and the metal line structure for power delivery each comprise copper.

Example embodiment 18 includes the integrated circuit structure of example embodiment 14 or some other example herein, wherein the metal line structure for heat transfer includes between ten and twenty-five layers and has a thickness of between about 5 um to about 25 um.

Example embodiment 19 includes the integrated circuit structure of example embodiment 14 or some other example herein, wherein the metal line structure for power delivery transfer includes between three and six layers and has a thickness of between about 10 um to about 20 um.

Example embodiment 20 includes the integrated circuit structure of example embodiment 14 or some other example herein, wherein the metal line structure for power delivery is coupled to a solder bump having a thickness of between about 10 um to about 15 um.

Example embodiment 21 includes a computing device, comprising: a board; and a component coupled to the board, the component including an integrated circuit structure, comprising: a bonded carrier; a passivation layer; a bonding layer between the bonded carrier and the passivation layer; and a metal line structure for heat transfer coupled to the bonded carrier and extending through the bonding layer and passivation layer.

Example embodiment 22 includes a computing device, comprising: a board; and a component coupled to the board, the component including an integrated circuit structure, comprising: a transistor that includes: a front side portion that includes at least a portion of the metal line structure for heat transfer; a bonded carrier coupled to the metal line structure for heat transfer; a first passivation layer; a bonding layer between the bonded carrier and the first passivation layer, wherein the metal line structure for heat transfer extends through the bonding layer and first passivation layer; and a back side portion that includes a metal line structure for power delivery coupled to a second passivation layer.