Patent Publication Number: US-2023154803-A1

Title: Semiconductor device and methods of manufacturing the same

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This Patent Application claims priority to U.S. Patent Application No. 63/264,131, filed on Nov. 16, 2021, and entitled “SEMICONDUCTOR DEVICE AND METHODS OF MANUFACTURING THE SAME.” The disclosure of the prior Application is considered part of and is incorporated by reference into this Patent Application. 
    
    
     BACKGROUND 
     Fin-based field effect transistor (FinFET) devices are three-dimensional structures that have a conductive channel region that includes a fin of semiconductor material that rises above a substrate as a three-dimensional structure. A gate structure, configured to control a flow of charge carriers within the conductive channel region, wraps around the fin of semiconductor material. For example, in a gate-all-around (GAA) FinFET structure, the gate structure wraps around all sides of a fin of semiconductor material, thereby forming conductive channel regions on all sides of the fin. A commonly used type of field effect transistor (FET) is a metal-oxide-semiconductor field-effect transistor (MOSFET). A MOSFET can be used, for example, as a switch for an electrical signal (e.g., a radio frequency (RF) switch) or as an amplifier for an electrical signal (e.g., a low-noise amplifier (LNA)), among other examples. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Aspects of the present disclosure are best understood from the following detailed description when read with the accompanying figures. It is noted that, in accordance with the standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion. 
         FIG.  1    is a diagram of an example environment in which systems and/or methods described herein may be implemented. 
         FIG.  2 A- 2 Q  are diagrams of an example semiconductor device described herein. 
         FIGS.  3 A- 3 P  are diagrams of an example semiconductor device described herein. 
         FIGS.  4 A- 4 C  are diagrams of an example semiconductor device described herein. 
         FIG.  5    is a diagram of example components of one or more devices of  FIG.  1    described herein. 
         FIGS.  6 - 8    are flowcharts of example processes relating to forming a semiconductor device described herein. 
     
    
    
     DETAILED DESCRIPTION 
     The following disclosure provides many different embodiments, or examples, for implementing different features of the provided subject matter. Specific examples of components and arrangements are described below to simplify the present disclosure. These are, of course, merely examples and are not intended to be limiting. For example, the formation of a first feature over or on a second feature in the description that follows may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features may be formed between the first and second features, such that the first and second features may not be in direct contact. In addition, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. 
     Further, spatially relative terms, such as “beneath,” “below,” “lower,” “above,” “upper” and the like, may be used herein for ease of description to describe one element or feature&#39;s relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The apparatus may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein may likewise be interpreted accordingly. 
     In some cases, a cut polysilicon structure may be formed within a device based on cutting out (e.g., etching away) a polysilicon structure to form a recessed portion of the device. The recessed portion may be filled with a dielectric material that may reduce a short channel effect and/or charge carrier tunneling between source/drains and/or between other semiconductor devices within the device. 
     Some implementations described herein provide techniques and apparatuses for forming an isolation structure between source/drains and/or between other semiconductor devices within a device. The isolation structure may be a funnel-shaped isolation structure having a greatest width at an upper portion of the funnel-shaped isolation structure and a smallest width at a lower portion of the funnel-shaped isolation structure. In this way, the funnel-shaped isolation structure may provide a greatest electrical barrier at the upper portion of the funnel-shaped isolation structure, which may be disposed between portions of neighboring fins having n-doped or p-doped epitaxial material. In some cases, the isolation structure may be formed on an isolation fin disposed between a first fin and a second fin. In this way, the isolation structure may have improved structural support based on bonding with the fin. In some cases, the isolation structure may be formed between a first gate structure and a second gate structure, with the isolation structure extending to at least a height of the first gate structure and the second gate structure from a well below the first gate structure and the second gate structure. In this way, the isolation structure may provide isolation between gate structures without forming the isolation structure in place of a polysilicon structure that may be used for another gate and/or to improve a device density of the device. In some implementations, the isolation structure may be a multi-layered isolation structure having layers with different N concentrations. The isolation structure may be deposited in a multi-stage deposition to separately deposit material for the multi-layered isolation structure. For example, one or more semiconductor processing tools may deposit an outside portion of the isolation structure using a first material and then may deposit (e.g., after etching a portion of the outside portion or after depositing the outside portion with a film-based deposition such as atomic layer deposition) an inside portion of the isolation structure using a second material. In some implementations, the multi-layered isolation structure may be a fully stressed and dense semiconductor structure. Additionally, or alternatively, the isolation structure may be formed at different levels of mechanical strength based on an atomic layer deposition process used to deposit layers of the isolation structure. 
       FIG.  1    is a diagram of an example environment  100  in which systems and/or methods described herein may be implemented. As shown in  FIG.  1   , environment  100  may include a plurality of semiconductor processing tools  102 - 108  and a wafer/die transport tool  110 . The plurality of semiconductor processing tools  102 - 108  may include a deposition tool  102 , an etching tool  104 , a planarization tool  106 , an ion implantation tool  108 , and/or another semiconductor processing tool. The tools included in the example environment  100  may be included in a semiconductor clean room, a semiconductor foundry, a semiconductor processing and/or manufacturing facility, or another location. 
     The deposition tool  102  is a semiconductor processing tool that is capable of depositing various types of materials onto a substrate. In some implementations, the deposition tool  102  includes a spin coating tool that is capable of depositing a photoresist layer on a substrate such as a wafer. In some implementations, the deposition tool  102  includes a chemical vapor deposition (CVD) tool such as a plasma-enhanced CVD (PECVD) tool, a high-density plasma CVD (HDP-CVD) tool, a sub-atmospheric CVD (SACVD) tool, an atomic layer deposition (ALD) tool, a plasma-enhanced atomic layer deposition (PEALD) tool, or another type of CVD tool. In some implementations, the deposition tool  102  includes a physical vapor deposition (PVD) tool, such as a sputtering tool or another type of PVD tool. In some implementations, the example environment  100  includes a plurality of types of deposition tools  102 . 
     The etching tool  104  is a semiconductor processing tool that is capable of etching various types of materials of a substrate, wafer, or semiconductor device. For example, the etching tool  104  may include a wet etching tool, a dry etching tool, and/or another type of etching tool. A wet etching tool may include a chemical etching tool or another type of wet etching tool that includes a chamber filled with an etchant. The substrate may be placed in the chamber for a particular time period to remove particular amounts of one or more portions of the substrate. A dry etching tool may include a plasma etching tool, a laser etching tool, a reactive ion etching tool, or a vapor phase etching tool, among other examples. A dry etching tool may remove one or more portions of the substrate using a sputtering technique, a plasma-assisted etch technique (e.g., a plasma sputtering technique or another type of technique involving the use of an ionized gas to isotropically or directionally etch the one or more portions), or another type of dry etching technique. 
     The planarization tool  106  is a semiconductor processing tool that is capable of polishing or planarizing various layers of a wafer or semiconductor device. For example, the planarization tool  106  may include a chemical mechanical planarization (CMP) tool and/or another type of planarization tool that polishes or planarizes a layer or surface of deposited or plated material. The planarization tool  106  may polish or planarize a surface of a semiconductor device with a combination of chemical and mechanical forces (e.g., chemical etching and free abrasive polishing). The planarization tool  106  may utilize an abrasive and corrosive chemical slurry in conjunction with a polishing pad and retaining ring (e.g., typically of a greater diameter than the semiconductor device). The polishing pad and the semiconductor device may be pressed together by a dynamic polishing head and held in place by the retaining ring. The dynamic polishing head may rotate with different axes of rotation to remove material and even out any irregular topography of the semiconductor device, making the semiconductor device flat or planar. 
     The ion implantation tool  108  is a semiconductor processing tool that is capable of implanting ions into a substrate such as a semiconductor wafer. The ion implantation tool  108  generates ions in an arc chamber from a source material such as a gas or a solid. The source material is provided into the arc chamber, and an arc voltage is discharged between a cathode and an electrode to produce a plasma containing ions of the source material. One or more extraction electrodes are used to extract the ions from the plasma in the arc chamber and accelerate the ions to form an ion beam. The ion beam may be directed toward the substrate such that the ions are implanted below the surface of the substrate to dope the substrate. 
     Wafer/die transport tool  110  includes a mobile robot, a robot arm, a tram or rail car, an overhead hoist transfer (OHT) vehicle, an automated material handling system (AMES), and/or another type of tool that is used to transport wafers and/or dies between semiconductor processing tools  102 - 108  and/or to and from other locations such as a wafer rack, a storage room, or another location. In some implementations, wafer/die transport tool  110  may be a programmed tool to travel a particular path and/or may operate semi-autonomously or autonomously. 
     The number and arrangement of tools shown in  FIG.  1    are provided as one or more examples. In practice, there may be additional tools, fewer tools, different tools, or differently arranged tools than those shown in  FIG.  1   . Furthermore, two or more tools shown in  FIG.  1    may be implemented within a single tool, or a single tool shown in  FIG.  1    may be implemented as multiple, distributed tools. Additionally, or alternatively, a set of tools (e.g., one or more tools) of environment  100  may perform one or more functions described as being performed by another set of tools of environment  100 . 
       FIGS.  2 A- 2 Q  are diagrams of an example semiconductor device  200  described herein. Semiconductor device  200  may be manufactured using an example process as shown in  FIGS.  2 A- 2 Q . The example process may include one or more operations not shown (e.g., lithography operations, operations performed on different portions of an electronic device that includes the semiconductor device  200 ) and/or operations shown in the example process may be performed in a different order from the order shown in  FIGS.  2 A- 2 Q . The semiconductor device  200  may include one or more additional devices, structures, and/or layers not shown in  FIGS.  2 A- 2 Q . For example, the semiconductor device  200  may include additional layers and/or dies formed on layers above and/or below the portion of the semiconductor device  200  shown in  FIGS.  2 A- 2 Q . Additionally, or alternatively, one or more additional semiconductor structures and/or semiconductor devices may be formed in a same layer, with a lateral displacement, of a device that includes the semiconductor device  200  shown in  FIGS.  2 A- 2 Q . 
     As shown in  FIG.  2 A , the semiconductor device  200  includes a substrate  202 . The substrate  202  may include a semiconductor die substrate, a semiconductor wafer, or another type of substrate in and/or on which semiconductor devices may be formed. In some implementations, the substrate  202  is formed of silicon (Si), a material including silicon, a III-V compound semiconductor material such as gallium arsenide (GaAs), a silicon on insulator (SOI), or another type of semiconductor material. 
     The semiconductor device  200  includes a metal-oxide-semiconductor (MOS) portion  204  having first polarity (e.g., an n-MOS), a MOS portion  206  having the first polarity (e.g., an n-MOS), and a MOS portion  208  having a second polarity (e.g., a p-MOS) that is opposite from the first polarity. The MOS portion  204  and the MOS portion  206  may include a well  210  having the second polarity (e.g., a p-well) and the MOS portion  208  may include a well  212  having the first polarity (e.g., an n-well). In some implementations, the well  210  has a p-type dopant, such as boron, aluminum, gallium, or indium, among other p-type dopants. In some implementations, the well  212  has an n-type dopant, such as phosphorus, arsenic, antimony, bismuth, or lithium, among other n-type dopants. In other implementations, the well  210  has an n-type dopant and the well  212  has a p-type dopant. 
     The well  210  and the well  212  may form lower portions of fins extending from the substrate  202 . The fins may include a stack of materials disposed on the well  210  and the well  212 . The fins may include an anti-punch through (APT) layer  214  disposed on the well  210  and the well  212 . The APT layer  214  may be configured to provide APT dopants that reduce n-type and/or p-type dopants from source/drain regions of the fins from penetrating into underlying layers of the semiconductor device  200 , such as the well  210  or the well  212 . Furthermore, inclusion of the APT layer  214  may remove a need to implement an APT implant at least in devices of a first type (e.g., n-type or p-type) during formation of such FinFET devices, which may result in undoped channel regions and improved electrical functionality. APT dopant implantation may be performed to form devices of a second type (e.g., the other of n-type or p-type) in the semiconductor device  200 . 
     The semiconductor device  200  may include a barrier implant region  216  formed on the APT layer  214 . The barrier implant region  216  may reduce electromigration between the APT layer  214  and an active fin region  218  disposed on the barrier implant region  216 . The barrier implant region  216  may include a silicon-based material that is doped (e.g., with a p-dopant or an n-dopant) and has implanted carbon or another material. In some aspects, the active fin region  218  may include a silicon-based material, such as silicon germanium (e.g., having a concentration of germanium that is greater than or equal to 1%) or pure silicon (e.g., having a concentration of germanium that is less than 1%). 
     In some implementations, one or more semiconductor processing tools may form a set of fins  220  associated with (e.g., formed on) the well  210  in the MOS portion  204 , a set of fins  222  associated with the well  210  in the MOS portion  206 , and an isolation fin  224  associated with the well  212  in the MOS portion  208 . 
     In some implementations, the one or more semiconductor processing tools (e.g., the ion implantation tool  108 ) form the wells  210  and  212  using ion implantation to implant dopants (e.g., of different polarity) into the wells  210  and  212  in separate processes. For example, the one or more semiconductor processing tools may provide a photoresist and/or a mask on a top surface of the MOS portion  208  while implanting a dopant into the MOS portions  204  and  206 . The one or more semiconductor processing tools may also provide a photoresist and/or a mask on a top surface of the MOS portions  204  and  206  while implanting a dopant into the MOS portion  208 . 
     In some implementations, the one or more semiconductor processing tools (e.g., the deposition tool  102 ) form the APT layer  214  on a top surface of the wells  210  and  212  and may form the barrier implant region  216  on a top surface of the APT layer  214 . For example, the one or more semiconductor processing tools deposit the APT layer  214  on a top surface of the wells  210  and  212  and deposit the barrier implant region  216  on a top surface of the APT layer  214  using chemical vapor deposition or physical vapor deposition, among other examples. In some implementations, the one or more semiconductor processing tools (e.g., the planarization tool  106 ) may polish and/or planarize the layers of the set of fins  220 , the set of fins  222 , and the isolation fin  224  after one or more layers are deposited. In this way, a top layer may be suitable for depositing additional material of the semiconductor device  200  and/or may improve uniformity of a subsequent etching process. 
     In some implementations, the one or more semiconductor processing tools (e.g., the deposition tool  102  and the etching tool  104 ) may form the active fin region  218  of the fins. In some implementations, the one or more semiconductor processing tools may deposit a first material for p-MOS or n-MOS channels (e.g., silicon germanium or pure silicon) and may then remove the first material from one or more MOS portions  204 ,  206 , or  208  having an opposite polarity from the first material. The one or more semiconductor processing tools may deposit a second material for n-MOS or p-MOS channels (e.g., having an opposite polarity from the first material) on the one or more MOS portions  204 ,  206 , or  208  from which the first material was removed. In this way, the channels of the set of fins  220  may have a same polarity as the channels of the set of fins  222 , whereas the channels of the isolation fin  224  may have an opposite polarity. 
     After forming fin stacks that include the APT layer  214  stacked on the wells  210  and  212 , the barrier implant region  216  stacked on the APT layer  214 , and the active fin region  218  stacked on the barrier implant region  216 , the one or more semiconductor processing tools (e.g., the etching tool  104 ) may remove portions of the fin stack to form the set of fins  220 , the set of fins  222 , and the isolation fin  224 . For example, the one or more semiconductor processing tools may use dry etching to form the fins  220 ,  222 , and  224  with generally vertical sidewalls with spacing between the fins. 
     As shown in  FIG.  2 B , material for a set of trench isolation structures  226  may be disposed on surfaces of the set of fins  220 , the set of fins  222 , and the isolation fin  224 . For example, the material for the set of trench isolation structures  226  may fill one or more gaps between fins (e.g., between fins of the set of fins  220 ) and/or may leave one or more gaps (e.g., recessed portions) between fins (e.g., between the isolation fin  224  and a nearest fin of the set of fins  220  and/or between the isolation fin  224  and the set of fins  222 ). The one or more semiconductor processing tools (e.g., the deposition tool  102 ) may deposit the material for the set of trench isolation structures  226  using chemical vapor deposition or physical vapor deposition, among other examples. In some implementations, the material for a set of trench isolation structures  226  includes silicon oxide, silicon germanium, silicon carbon-nitride, silicon nitride, and/or a high-K material. 
     As shown in  FIG.  2 C , a first dummy fin portion  228  may be deposited in the gaps between fins. For example, the one or more semiconductor processing tools (e.g., deposition tool  102 ) may deposit material for the first dummy fin portion  228  using PVD or CVD. In some implementations, the material for the first dummy fin portion  228  may include Silicon carbon nitride, a high-K material, poly 2-ethyl-2-oxazoline (PEOx), and/or another passivation layer material to reduce reactivity between materials on opposite sides of the first dummy fin portion  228 . 
     As shown in  FIG.  2 D , a portion of the material of the first dummy fin portion  228  may be removed. For example, the one or more semiconductor processing tools (e.g., etching tool  104  and/or planarization tool  106 ) may remove the material of the first dummy fin portion  228  from surfaces of the material for the trench isolation structure  226  that are disposed above the active fin region  218 . In some aspects, the material of the first dummy fin portion  228  may be removed from regions of the semiconductor device  200  except within gaps between fins. In some aspects, upper portions of the material of the first dummy fin portion  228  may be removed from the gaps between fins, as shown in  FIG.  2 D . 
     As shown in  FIG.  2 E , a second dummy fin portion  230  may be deposited on top of the first dummy fin portion  228  (e.g., within gaps between fins). For example, the one or more semiconductor processing tools (e.g., deposition tool  102 ) may deposit material for the second dummy fin portion  230  using PVD or CVD. In some implementations, the material for the second dummy fin portion  230  may include silicon carbon nitride, a high-K material, poly 2-ethyl-2-oxazoline (PEOx), and/or another passivation layer material to reduce reactivity between materials on opposite sides of the first dummy fin portion  228 . In some implementations, the second dummy fin portion  230  may include multiple layers of materials, such as a first high-K material and a second high-K material, such as silicon carbon nitride. 
     As shown in  FIG.  2 F , a portion of the material of the second dummy fin portion  230  may be removed. For example, the one or more semiconductor processing tools (e.g., etching tool  104  and/or planarization tool  106 ) may remove the material of the second dummy fin portion  230  from surfaces of the material for the trench isolation structure  226  that are disposed above the active fin region  218 . In some aspects, the material of the second dummy fin portion  230  may be removed from regions of the semiconductor device  200  except within gaps between fins. In some aspects, upper portions of the material of the second dummy fin portion  230  may be removed from the gaps between fins, as shown in  FIG.  2 F . 
     In some implementations, the first dummy fin portion  228  and the second dummy fin portion  230  may form one or more dummy fins. Additionally, or alternatively, the one or more dummy fins may include only a single material (e.g., a single dummy fin portion). The one or more dummy fins may provide isolation between the set of fins  220  and the isolation fin  224  and between the set of fins  222  and the isolation fin  224 . The one or more dummy fins may be unattached from any fins  220 ,  222 , or  224  and may be spaced (e.g., vertically and/or laterally) from the well  210  and the well  212 . 
     As shown in  FIG.  2 G , a portion of the material of the trench isolation structure  226  may be removed. For example, the one or more semiconductor processing tools (e.g., etching tool  104  and/or planarization tool  106 ) may remove the material of the trench isolation structure  226  from surfaces of the active fin region  218 . In some aspects, the material of the trench isolation structure  226  may be removed from regions of the semiconductor device  200  that are higher than a bottom surface of the active fin region  218 . 
     As shown in  FIG.  2 H , a polysilicon structure  232  may be deposited around the set of fins  220 , the set of fins  222 , the isolation fin  224 , and/or the second dummy fin portions  230 . In some implementations, the polysilicon structure  232  may be a sacrificial material that may be fully or partially removed during a manufacturing process. For example, the polysilicon structure  232  may be removed and replaced by a metal gate structure during the manufacturing process. 
     In some implementations, the polysilicon structure  232  may be removed from a portion of the set of fins  220 , the set of fins  222 , the isolation fin  224 , and/or the second dummy fin portions  230  at a cross section shown in  FIG.  2 H , such that a remaining portion of the polysilicon structure  232  is behind the set of fins  220 , the set of fins  222 , the isolation fin  224 , and/or the second dummy fin portions  230 . In this way, the portion of the set of the set of fins  220 , the set of fins  222 , the isolation fin  224 , and/or the second dummy fin portions  230  may be exposed for deposition of one or more additional structures outside of the remining portion of the polysilicon structure  232 . 
     As shown in  FIG.  2 I , a sidewall structure  234  (e.g., a dummy sidewall structure) may be deposited on side surfaces and/or top surfaces of the set of fins  220 , the set of fins  222 , the isolation fin  224 , the second dummy fin portions  230 , and/or the trench isolation structures  226 . 
     As shown in  FIG.  2 J , a portion of the sidewall structure  234  may be removed from top surfaces  236  of the set of fins  220 , the set of fins  222 , the isolation fin  224 , and/or the second dummy fin portions  230 . 
     As shown in  FIG.  2 K , portions of the active fin region  218  may be removed along various cross-sectional locations of the semiconductor device  200 . The active fin region  218  is shown in dashed lines to show that the active fin region  218  remains in other cross-sectional locations of the semiconductor device  200 . For example, the one or more semiconductor processing tools (e.g., etching tool  104 ) may remove the portions of the active fin region  218  of the set of fins  220  and the set of fins  222 . In some implementations, a fin sidewall structure  238  may remain at a base of the removed portions of the active fin region  218 . The fin sidewall structure  238  may include a remaining portion of the sidewall structure  234  and/or a portion of the active fin region  218 . 
     As shown in  FIG.  2 L , the one or more semiconductor processing tools (e.g., the deposition tool  102  and/or the ion implantation tool  108 ) may form epitaxial structures  240  on between remaining portion of the active fin region  218  of the set of fins  220  and the set of fins  222 . In some implementations, the one or more semiconductor processing tools deposit the material for the epitaxial structures  240  using chemical vapor deposition, physical vapor deposition, and/or epitaxial growth deposition, among other examples. In some aspects, the set of fins  220  and the set of fins  222  may be configured as source/drains based on forming the epitaxial structures  240 . In some implementations, the one or more semiconductor processing tools may also form epitaxial structures  240  on the isolation fin  224  (e.g., at various other cross-sectional location of the semiconductor device  200 ). 
     As shown in  FIG.  2 M , the one or more semiconductor processing tools (e.g., the deposition tool  102 ) may form a dielectric layer  242  around and/or on the set of fins  220 , the isolation fin  224 , and the second of fins  222 . In some implementations, the dielectric layer  242  includes an inter-layer dielectric. The dielectric layer  242  may include a low-k material, such as silicon dioxide, silicon nitride, or silicon oxynitride, among other examples. The dielectric layer  242  may provide structural support to the semiconductor device  200  and electrical insulation between structures within the semiconductor device  200 . 
     As shown in  FIG.  2 N , the one or more semiconductor processing tools (e.g., the etching tool  104 ) may remove a portion of the dielectric layer  242  and a portion of the trench isolation structure  226  from at least one side (e.g., multiple sides) of the isolation fin  224 . For example, the one or more semiconductor processing tools may remove the portion of the trench isolation structure  226  that is above a bottom surface of the APT layer  214  of the isolation fin  224 . In some implementations, the one or more processing tools may form a recessed portion  244  of the semiconductor device  200  that extends from the isolation fin  224  to one or more of the dummy fins (e.g., nearest dummy fins). 
     As shown in  FIG.  20   , the one or more semiconductor processing tools (e.g., the deposition tool  102 ) may deposit isolation material on the at least one side of the isolation fin  224  after removing the portion the dielectric layer  242  and the portion of the trench isolation structure  226 . In some implementations, the one or more semiconductor processing tools may deposit the isolation material on at least one side (e.g., on multiple sides) of the isolation fin  224  using chemical vapor deposition and/or physical vapor deposition, among other examples. In some aspects, the one or more semiconductor processing tools may deposit the isolation material on at least one side of the APT layer  214  of the isolation fin  224  and/or extending to the one or more dummy fins. The isolation material may include an oxide-based material (e.g., silicon oxide). 
     The isolation structure  246  may extend to a height that is above a top surface of the isolation fin  224 . In some implementations, the isolation structure  246  extends to a top surface of the dielectric layer  242 , through a silicon nitride layer that is disposed on the dielectric layer  242 , and/or through another dielectric layer disposed on the silicon nitride layer. 
     In some implementations, the isolation structure  246  has a width, at a top portion of the isolation structure  246 , that matches a pitch of the one or more dummy fins (e.g., in a range of approximately 30 nanometers to approximately 100 nanometers). In some implementations, the isolation structure  246  has a width, at a bottom portion of the isolation structure  246 , that includes a first distance (e.g., in a range of approximately 10 nanometers to approximately 30 nanometers) from the isolation fin  224  to a dummy fin between the isolation fin  224  and the set of fins  220  and includes a second distance (e.g., in a range of approximately 5 nanometers to approximately 30) from the isolation fin  224  to a dummy fin between the isolation fin  224  and the set of fins  222 . The first distance and the second distance may be equal or may be different. 
     The isolation structure  246  may have a total height in a range of approximately 200 nanometers to approximately 500 nanometers. In some implementations, the isolation structure  246  extends below a top surface of the trench isolation structure  226  with a height in a range of approximately 100 nanometers to approximately 150 nanometers. In this way, the isolation structure  246  extends to a depth that is sufficient to surround and/or isolate the APT layers  214  of the isolation fin  224  and to provide lateral insulation between APT layers  214  of set of fins  220  and the set of fins  222 . In some implementations, the isolation structure  246  may be configured to extend below a bottom surface of the APT layers  214  by an amount in a range of approximately 5 nanometers to approximately 30 nanometers to account for potential variation in etching and to improve a likelihood of extending at least to the bottom surface of the APT layers  214 . 
     As shown in  FIGS.  2 A- 2 O , the semiconductor device includes an isolation structure (e.g., an isolation oxide) on one or more sides of the isolation fin  224  that is disposed between a first set of fins  220  and a second set of fins  222  that may include source/drains (e.g., having a same polarity) or other devices. 
       FIG.  2 P  shows of top view of one or more implementations of the semiconductor device  200 . As shown in  FIG.  2 P , a set of fins (e.g., the set of fins  220 , the isolation fin  224 , and the set of fins  222 ) may be formed as substantially parallel fins. The one or more fins may be separated by one or more dummy fins  250  (e.g., including the first dummy fin portion  228  and/or the second dummy fin portion  230 ). 
     The one or more fins may have one or more epitaxial structures disposed thereon. For example, the one or more of the fins may have a first type of epitaxial structure  240 A (e.g., an N-type epitaxial structure) and a second type of epitaxial structure  240 B (e.g., a P-type epitaxial structure). 
     The semiconductor device  200  may also include a set of polysilicon gates  232  disposed orthogonally to the one or more fins. In some implementations, the isolation structure  246  may be disposed on the isolation fin  224  based on cutting away a portion of the polysilicon gates  232  between two of the fins  222  and/or extending between two dummy fins  250 . 
       FIG.  2 Q  shows an isometric view of the semiconductor device  200 . As shown in  FIG.  2 Q , in some implementations, the isolation structure  246  may include a cut poly (CPO) structure that is disposed in place of a polysilicon gate in an isolation area of the semiconductor device  200 . For example, forming the recessed portion  244  described in connection with  FIG.  2 N  may include cutting (e.g., etching away) a portion of the polysilicon structure  232  in the isolation area that includes the isolation structure  246 . Forming the isolation structure  246  may include depositing isolation material in the isolation area in place of the removed portion of the polysilicon structure  232 . The isolation structure  246  may surround at least a portion of the isolation fins  224  (e.g., instead of being deposited in place of the isolation fins  224 ). 
     The semiconductor device  200  also includes the dielectric layer  242  deposited outside of the isolation structure  246 . In some implementations, the epitaxial structures  240  (e.g., source/drains) may be formed on the set of fins  220  between polysilicon structures  232  before depositing the dielectric layer  242  around the epitaxial structures  240 . In some implementations, the polysilicon structures  232  may be removed and then filled with a gate structure (e.g., a metal gate structure) in a later stage of a manufacturing process. 
     As indicated above,  FIGS.  2 A- 2 P  are provided as an example. Other examples may differ from what is described with regard to  FIGS.  2 A- 2 P . The number and arrangement of devices, layers, and/or materials shown in  FIGS.  2 A- 2 P  are provided as an example. In practice, there may be additional devices, layers, and/or materials, fewer devices, layers, and/or materials, different devices, layers, and/or materials, or differently arranged devices, layers, and/or materials than those shown in  FIGS.  2 A- 2 P . 
       FIGS.  3 A- 3 P  are diagrams of an example semiconductor device  300  described herein. Semiconductor device  300  may be manufactured using an example process as shown in  FIGS.  3 A- 3 P . The example process may include one or more operations not shown (e.g., lithography operations, operations performed on different portions of an electronic device that includes the semiconductor device  300 ) and/or operations shown in the example process may be performed in a different order from the order shown in  FIGS.  3 A- 3 P . The semiconductor device  300  may include one or more additional devices, structures, and/or layers not shown in  FIGS.  3 A- 3 P . For example, the semiconductor device  300  may include additional layers and/or dies formed on layers above and/or below the portion of the semiconductor device  300  shown in  FIGS.  3 A- 3 P . Additionally, or alternatively, one or more additional semiconductor structures and/or semiconductor devices may be formed in a same layer, with a lateral displacement, of a device that includes the semiconductor device  300  shown in  FIGS.  3 A- 3 P . Elements shown in  FIGS.  3 A- 3 P  having a same reference number as those in  FIGS.  2 A- 2 Q  may have a same or similar composition and/or function. 
     As shown in  FIG.  3 A , the semiconductor device  300  includes a substrate  202  having a MOS portion  204  and a MOS portion  206  having an opposite polarity as the MOS portion  204 . The semiconductor device  300  also includes a MOS portion  208 . The MOS portion  208  may be an undoped portion of the semiconductor device  300  or may have a same polarization as the MOS portion  204  or the MOS portion  206 . The MOS portion  204  includes a well  210  disposed on the substrate  202 , the MOS portion  206  includes a well  302  disposed on the substrate  202 , and the MOS portion  208  includes a well  212  disposed on the substrate. The well  302  has an opposite polarity as the well  210 . The well  212  may be an undoped portion of the substrate  202  or may have a same polarity as the well  210  or the well  302 . The well  302  and the well  210  may be separated by the well  212  or may meet at an interface (e.g., in implementations where the well  212  has a same polarity as the well  210  or the well  302 . The substrate  202 , the well  302 , the well  210 , and/or the well  212  may have one or more characteristics and/or may be formed using similar procedures as the substrate  202 , the well  210 , and/or the well  212  described in connection with  FIG.  2 A . 
     The semiconductor device  300  may also include fin stacks on top of the well  302 , the well  210 , and/or the well  212 . The fin stacks may include an APT layer  214 , a barrier implant region  216 , and an active fin region  218 , which may have one or more characteristics and/or may be formed using similar procedures as the APT layer  214 , a barrier implant region  216 , and the active fin region  218  described in connection with  FIG.  2 A . The fin stacks may be formed into a first set of fins  220 , a second set of fins  222 , and/or an isolation fin  224  (e.g., using similar procedures to those described in connection with  FIG.  2 A ). 
     As shown in  FIG.  3 B , material for a set of trench isolation structures  226  may be disposed on surfaces of the set of fins  220 , the set of fins  222 , and the isolation fin  224 . For example, the material for the set of trench isolation structures  226  may fill one or more gaps between fins (e.g., between fins of the set of fins  220 ) and/or may leave one or more gaps (e.g., recessed portions) between fins (e.g., between the isolation fin  224  and a nearest fin of the set of fins  220  and/or between the isolation fin  224  and the set of fins  222 ). The one or more semiconductor processing tools (e.g., the deposition tool  102 ) may deposit the material for the set of trench isolation structures  226  using chemical vapor deposition or physical vapor deposition, among other examples. In some implementations, the material for a set of trench isolation structures  226  includes silicon oxide, silicon germanium, silicon carbon-nitride, silicon nitride, and/or a high-K material. 
     As shown in  FIG.  3 C , a first dummy fin portion  228  may be deposited in the gaps between fins. For example, the one or more semiconductor processing tools (e.g., deposition tool  102 ) may deposit material for the first dummy fin portion  228  using PVD or CVD. In some implementations, the material for the first dummy fin portion  228  may include Silicon carbon nitride, a high-K material, poly 2-ethyl-2-oxazoline (PEOx), and/or another passivation layer material to reduce reactivity between materials on opposite sides of the first dummy fin portion  228 . 
     As shown in  FIG.  3 D , a portion of the material of the first dummy fin portion  228  may be removed. For example, the one or more semiconductor processing tools (e.g., etching tool  104  and/or planarization tool  106 ) may remove the material of the first dummy fin portion  228  from surfaces of the material for the trench isolation structure  226  that are disposed above the active fin region  218 . In some aspects, the material of the first dummy fin portion  228  may be removed from regions of the semiconductor device  300  except within gaps between fins. In some aspects, upper portions of the material of the first dummy fin portion  228  may be removed from the gaps between fins, as shown in  FIG.  3 D . 
     As shown in  FIG.  3 E , a second dummy fin portion  230  may be deposited on top of the first dummy fin portion  228  (e.g., within gaps between fins). For example, the one or more semiconductor processing tools (e.g., deposition tool  102 ) may deposit material for the second dummy fin portion  230  using PVD or CVD. In some implementations, the material for the second dummy fin portion  230  may include silicon carbon nitride, a high-K material, poly 2-ethyl-2-oxazoline (PEOx), and/or another passivation layer material to reduce reactivity between materials on opposite sides of the first dummy fin portion  228 . In some implementations, the second dummy fin portion  230  may include multiple layers of materials, such as a first high-K material and a second high-K material, such as silicon carbon nitride. 
     As shown in  FIG.  3 F , a portion of the material of the second dummy fin portion  230  may be removed. For example, the one or more semiconductor processing tools (e.g., etching tool  104  and/or planarization tool  106 ) may remove the material of the second dummy fin portion  230  from surfaces of the material for the trench isolation structure  226  that are disposed above the active fin region  218 . In some aspects, the material of the second dummy fin portion  230  may be removed from regions of the semiconductor device  300  except within gaps between fins. In some aspects, upper portions of the material of the second dummy fin portion  230  may be removed from the gaps between fins, as shown in  FIG.  3 F . 
     In some implementations, the first dummy fin portion  228  and the second dummy fin portion  230  may form a dummy fin. Additionally, or alternatively, the dummy fin may include only a single material (e.g., a single dummy fin portion). The dummy fin may provide isolation between the set of fins  220  and the isolation fin  224  and between the set of fins  222  and the isolation fin  224 . The one or more dummy fins may be unattached from any fins  220 ,  222 , or  224  and may be spaced (e.g., vertically and/or laterally) from the well  210  and the well  212 . 
     As shown in  FIG.  3 G , a portion of the material of the trench isolation structure  226  may be removed. For example, the one or more semiconductor processing tools (e.g., etching tool  104  and/or planarization tool  106 ) may remove the material of the trench isolation structure  226  from surfaces of the active fin region  218 . In some aspects, the material of the trench isolation structure  226  may be removed from regions of the semiconductor device  300  that are higher than a bottom surface of the active fin region  218 . 
     As shown in  FIG.  3 H , a polysilicon structure  232  may be deposited around the set of fins  220 , the set of fins  222 , the isolation fin  224 , and/or the second dummy fin portions  230 . In some implementations, the polysilicon structure  232  may be a sacrificial material that may be fully or partially removed during a manufacturing process. For example, the polysilicon structure  232  may be removed and replaced by a metal gate structure during the manufacturing process. 
     In some implementations, the polysilicon structure  232  may be removed from a portion of the set of fins  220 , the set of fins  222 , the isolation fin  224 , and/or the second dummy fin portions  230  at a cross section shown in  FIG.  3 H , such that a remaining portion of the polysilicon structure  232  is behind the set of fins  220 , the set of fins  222 , the isolation fin  224 , and/or the second dummy fin portions  230 . In this way, the portion of the set of the set of fins  220 , the set of fins  222 , the isolation fin  224 , and/or the second dummy fin portions  230  may be exposed for deposition of one or more additional structures outside of the remining portion of the polysilicon structure  232 . 
     As shown in  FIG.  3 I , a sidewall structure  234  (e.g., a dummy sidewall structure) may be deposited on side surfaces and/or top surfaces of the set of fins  220 , the set of fins  222 , the isolation fin  224 , the second dummy fin portions  230 , and/or the trench isolation structures  226 . 
     As shown in  FIG.  3 J , a portion of the sidewall structure  234  may be removed from top surfaces  236  of the set of fins  220 , the set of fins  222 , the isolation fin  224 , and/or the second dummy fin portions  230 . 
     As shown in  FIG.  3 K , portions of the active fin region  218  may be removed along various cross-sectional locations of the semiconductor device  300 . The active fin region  218  is shown in dashed lines to show that the active fin region  218  remains in other cross-sectional locations of the semiconductor device  300 . For example, the one or more semiconductor processing tools (e.g., etching tool  104 ) may remove the portions of the active fin region  218  of the set of fins  220  and the set of fins  222 . In some implementations, a fin sidewall structure  238  may remain at a base of the removed portions of the active fin region  218 . The fin sidewall structure  238  may include a remaining portion of the sidewall structure  234  and/or a portion of the active fin region  218 . 
     As shown in  FIG.  3 L , the one or more semiconductor processing tools (e.g., the deposition tool  102  and/or the ion implantation tool  108 ) may form epitaxial structures  240  on between remaining portion of the active fin region  218  of the set of fins  220  and the set of fins  222 . In some implementations, the one or more semiconductor processing tools deposit the material for the epitaxial structures  240  using chemical vapor deposition, physical vapor deposition, and/or epitaxial growth deposition, among other examples. In some aspects, the set of fins  220  and the set of fins  222  may be configured as source/drains based on forming the epitaxial structures  240 . In some implementations, the one or more semiconductor processing tools may also form epitaxial structures  240  on the isolation fin  224  (e.g., at various other cross-sectional location of the semiconductor device  300 ). 
     As shown in  FIG.  3 M , the one or more semiconductor processing tools (e.g., the deposition tool  102 ) may form a dielectric layer  242  around and/or on the set of fins  220 , the isolation fin  224 , and the second of fins  222 . In some implementations, the dielectric layer  242  includes an inter-layer dielectric. The dielectric layer  242  may include a low-k material, such as silicon dioxide, silicon nitride, or silicon oxynitride, among other examples. The dielectric layer  242  may provide structural support to the semiconductor device  300  and electrical insulation between structures within the semiconductor device  300 . 
     As shown in  FIG.  3 N , the one or more semiconductor processing tools (e.g., the etching tool  104 ) may remove a portion of the dielectric layer  230 , a portion of the trench isolation structure  226 , a portion of the isolation fin  224 , and/or a portion of the well  212  (e.g., to separate different well types at an interface) to form a recessed portion  304 . In some implementations, the one or more semiconductor processing tools may use multiple etching steps to form the recessed portion  304 . For example, the one or more semiconductor processing tools may perform a first etching operation, on a relatively wide portion of the semiconductor device, to remove an upper portion of a recessed portion  304 . The one or more semiconductor processing tools may perform a second etching operation, on a portion of the semiconductor device  300  that is narrower than the first etching operation, to remove a middle portion of the recessed portion  304 . The one or more semiconductor processing tools may perform additional etching operations on progressively narrower portions of the semiconductor device  300  to form a funnel-shaped recessed portion  304 . 
     As shown in  FIG.  30   , the one or more semiconductor processing tools (e.g., the deposition tool  102 ) may deposit isolation material within the recessed portion  304 . In some implementations, the one or more semiconductor processing tools may deposit the isolation material, to form an isolation structure  306 , using chemical vapor deposition and/or physical vapor deposition, among other examples. 
     The isolation structure  246  may include a CPO structure that is disposed in place of a polysilicon gate in an isolation area of the semiconductor device  300 . For example, forming the recessed portion  244  described in connection with  FIG.  3 N  may include cutting (e.g., etching away) a portion of the polysilicon structure  232  in the isolation area that includes the isolation structure  306 . Forming the isolation structure  306  may include depositing isolation material in the isolation area in place of the removed portion of the polysilicon structure  232 . The isolation structure  306  may also be deposited in place of the isolation fin  224 . 
     The one or more semiconductor processing tools may deposit the isolation structure  306  in multiple steps. For example, the one or more semiconductor processing tool may deposit a liner material to improve adhesion and/or to reduce peeling. Additionally, the one or more semiconductor processing tools may form an outer portion  306 A of the isolation structure  306  in a first operation and may form an inner portion  306 B within the outer portion  306 A. For example, an etching tool may remove an inner portion of material used to form the outer portion  306 A, and a deposition tool may deposit the material used to form the inner portion  306 B in place of the removed inner portion of the material used to form the outer portion  306 A. The outer portion  306 A may be formed of a different material than the inner portion  306 B 
     The isolation structure  306  may be formed of a material that includes a ceramic material, silicon and nitrogen (e.g., silicon nitride), silicon and carbon (silicon carbide), aluminum and nitrogen (aluminum nitride), aluminum and oxygen (e.g., aluminum oxide), silicon, oxygen, and nitrogen, and/or silicon oxygen, carbon, and nitrogen, among other examples. 
     Based at least in part on a position of the isolation structure  306  between the set of fins  220  and the set of fins  222 , the isolation structure  306  may reduce electron leaking between p-FETs and n-FETs of the semiconductor device. The funnel shape of the isolation structure  306  may improve electron leaking reduction based on having a greatest thickness (e.g., a greatest insolation) at a height, relative to the substrate  302 , that is approximately a same height as the epitaxial structures  240  that may otherwise be sources of electron leaking. 
     The isolation structure  306  has a first width (e.g., in a range of approximately 40 nanometers to approximately 100 nanometers above the epitaxial structures  240 , which is greater than a second width (e.g., in a range of approximately 15 nanometers to approximately 50 nanometers) of the isolation structure  306  within the trench isolation structure  306 ). The second width is greater than a third width (e.g., in a range of approximately 10 nanometers to approximately 30 nanometers) of the isolation structure  306  within the well  212  (e.g., at the interface). 
     The isolation structure may have a height in a range of approximately 300 nanometers to approximately 300 nanometers. In some implementations, the isolation structure  306  may penetrate into the well  302  and the well  212  at a depth in a range of approximately 10 nanometers to approximately 30 nanometers. In some implementations, a lowest point of the isolation structure  306  may be a distance (e.g., in a range of approximately 5 nanometers to approximately 20 nanometers) below a lowest point of the trench isolation structure  306  (e.g., based on a bottom surface of the trench isolation structure  226  being curved). The isolation structure  306  may have a depth below a top surface of the trench isolation structure  306  and/or a bottom surface of the set of fins  220  and the set of fins  222 , with the depth being a distance in a range of approximately 100 nanometers to approximately 250 nanometers. 
     As shown in  FIGS.  3 A- 3 P , the semiconductor device includes an isolation structure (e.g., an isolation oxide) disposed in place of the isolation fin  224  that is disposed between a first set of fins  220  and a second set of fins  222  that may include source/drains having opposite polarization. 
       FIG.  3 M  shows of top view of one or more implementations of the semiconductor device  300 . As shown in  FIG.  3 M , a set of fins (e.g., the set of fins  220 , the isolation fin  224 , and the set of fins  222 ) may be formed as substantially parallel fins. The one or more fins may be separated by one or more dummy fins  250  (e.g., including the first dummy fin portion  228  and/or the second dummy fin portion  230 ). 
     The one or more fins may have one or more epitaxial structures disposed thereon. For example, the one or more of the fins may have a first type of epitaxial structure  240 A (e.g., an N-type epitaxial structure) and a second type of epitaxial structure  240 B (e.g., a P-type epitaxial structure). 
     The semiconductor device  300  may also include a set of polysilicon gates  232  disposed orthogonally to the one or more fins. In some implementations, the isolation structure  306  may be disposed on the isolation fin  224  based on cutting away a portion of the polysilicon gates  232  between the first type of epitaxial structure  240 A and the second type of epitaxial structure  240 B. 
     As indicated above,  FIGS.  3 A- 3 P  are provided as an example. Other examples may differ from what is described with regard to  FIGS.  3 A- 3 P . The number and arrangement of devices, layers, and/or materials shown in  FIGS.  3 A- 3 P  are provided as an example. In practice, there may be additional devices, layers, and/or materials, fewer devices, layers, and/or materials, different devices, layers, and/or materials, or differently arranged devices, layers, and/or materials than those shown in  FIGS.  3 A- 3 P . 
       FIGS.  4 A- 4 C  are diagrams of an example semiconductor device  400  described herein. Semiconductor device  400  may be manufactured using an example process as shown in  FIGS.  4 A- 4 C . The example process may include one or more operations not shown (e.g., lithography operations, operations performed on different portions of an electronic device that includes the semiconductor device  400 ) and/or operations shown in the example process may be performed in a different order from the order shown in  FIGS.  4 A- 4 C . The semiconductor device  400  may include one or more additional devices, structures, and/or layers not shown in  FIGS.  4 A- 4 C . For example, the semiconductor device  400  may include additional layers and/or dies formed on layers above and/or below the portion of the semiconductor device  400  shown in  FIGS.  4 A- 4 C . Additionally, or alternatively, one or more additional semiconductor structures and/or semiconductor devices may be formed in a same layer, with a lateral displacement, of a device that includes the semiconductor device  400  shown in  FIGS.  4 A- 4 C . 
     As shown in  FIG.  4 A , the semiconductor device  400  includes a substrate  402  having a well  404  disposed on the substrate  402  and/or one or more additional layers of materials disposed on the well  404 . The substrate  402  and the well  404  may have one or more characteristics and/or may be formed using similar procedures as the substrate  202 , the well  210 , and the well  212  described in connection with  FIG.  2 A . 
     The semiconductor device  400  may include a semiconductor structure  406  disposed on the well  404 , with the semiconductor structure  406  including fins  410 . The semiconductor structure  406  also includes source/drains  408  on opposite sides of the fins  410 . The semiconductor device  400  includes a set of gate structures disposed on the fins  410  and the source/drains  408 . The set of gate structures includes a first gate structure  412 A, a second gate structure  412 B, a third gate structure  412 C, and/or a fourth gate structure  412 D, with a dielectric structure  414  disposed between the gate structures  412 A- 412 D. The gate structures include one or more dielectric structures  416  disposed on opposite sides of a dummy gate structure  418 . For example, the one or more dielectric structures may include an inter-layer dielectric and/or a spacer deposited around the dummy gate structure  418 . In some implementations, the dummy gate structure  418  may be configured to be removed and replaced with a gate material at a later step of the manufacturing process. 
     As shown in  FIG.  4 B  the one or more semiconductor processing tools (e.g., the etching tool  104 ) may remove a portion of the dielectric structure  414  and/or a portion of the semiconductor structure  406  to form a recessed portion  420  that extends from a top surface of the semiconductor device  400  to the well  404 . For example, the one or more semiconductor processing tools may use dry etching and/or wet etching to remove the portion of the dielectric structure  414  and/or the portion of the semiconductor structure  406  to form a recessed portion  420 . 
     As shown in  FIG.  4 C , the one or more semiconductor processing tools (e.g., the deposition tool  102 ) may deposit isolation material within the recessed portion  420 . In some implementations, the one or more semiconductor processing tools may deposit the isolation material, to form an isolation structure  422 , using chemical vapor deposition and/or physical vapor deposition, among other examples. 
     The one or more semiconductor processing tools may deposit the isolation structure  422  in multiple steps. For example, the one or more semiconductor processing tool may deposit a liner material to improve adhesion and/or to reduce peeling. Additionally, the one or more semiconductor processing tools may form an outer portion  422 A of the isolation structure  422  in a first operation and may form an inner portion  422 B within the outer portion  422 A. For example, an etching tool may remove an inner portion of material used to form the outer portion  422 A, and a deposition tool may deposit the material used to form the inner portion  422 B in place of the removed inner portion of the material used to form the outer portion  422 A. The outer portion  422 A may be formed of a different material than the inner portion  422 B. 
     The isolation structure  422  may be formed of a material that includes silicon and nitrogen (e.g., silicon nitride), silicon and carbon (silicon carbide), aluminum and nitrogen (aluminum nitride), aluminum and oxygen (e.g., aluminum oxide), silicon, oxygen, and nitrogen, and/or silicon oxygen, carbon, and nitrogen, among other examples. 
     The isolation structure  422  may include a liner that forms a sidewall of the isolation structure. The liner may have a thickness in a range of approximately 0.5 nanometers to approximately 3 nanometers and/or may include silicon nitride. The inner portion  422 B may have a thickness in a range of approximately 0.5 nanometers to approximately 5 nanometers and/or may include silicon nitride. 
     The isolation structure  422  may have a width above the source/drains that is in a range of approximately 10 nanometers to approximately 30 nanometers. The isolation structure  422  may have a width below the source/drains  408  that is in a range of approximately 5 nanometers to approximately 30 nanometers. The isolation structure  422  may extend a distance (e.g., in a distance (e.g., in a range of approximately 100 nanometers to approximately 250 nano surface of the source/drains  408 . 
     Although not shown, the isolation structure  422  may be disposed on top of the gate structures  412 A- 412 D. In some implementations, a portion of the isolation structure  422  on the top of the gate structures  412 A- 412 D includes a first layer disposed on the top of the gate structures  412 A- 412 D and a second layer disposed on the first layer. The second layer may be disposed using plasma enhanced chemical vapor deposition. The first layer and the second layer are both dielectric materials configured to provide isolation and/or insulation to the gate structures  412 A- 412 D. The isolation structure  422  may include a cut-polysilicon structure. The isolation structure  422  may be deposited around a portion of a fin structure or may be deposited between fin structures (e.g., in place of a removed portion of a fin structure). The isolation structure  422  may be disposed along a y-axis of the semiconductor device (e.g., a vertical direction as shown in  FIGS.  2 P and  3 M ). 
     Based on the semiconductor device  400  including the isolation structure  422  between the gate structures  412 A- 412 D, the semiconductor device  400  may have an increased device density and/or may have reduced current leakage and/or charge carrier tunneling that may have otherwise been caused by a narrow source/drain pitch. 
     As indicated above,  FIGS.  4 A- 4 C  are provided as an example. Other examples may differ from what is described with regard to  FIGS.  4 A- 4 C . The number and arrangement of devices, layers, and/or materials shown in  FIGS.  4 A- 4 C  are provided as an example. In practice, there may be additional devices, layers, and/or materials, fewer devices, layers, and/or materials, different devices, layers, and/or materials, or differently arranged devices, layers, and/or materials than those shown in  FIGS.  4 A- 4 C . 
       FIG.  5    is a diagram of example components of a device  500 , which may correspond to deposition tool  102 , etching tool  104 , planarization tool  106 , ion implantation tool  108 , and/or wafer/die transport tool  110 . In some implementations, deposition tool  102 , etching tool  104 , planarization tool  106 , ion implantation tool  108 , and/or wafer/die transport tool  110  may include one or more devices  500  and/or one or more components of device  500 . As shown in  FIG.  5   , device  500  may include a bus  510 , a processor  520 , a memory  530 , an input component  540 , an output component  550 , and a communication component  560 . 
     Bus  510  includes one or more components that enable wired and/or wireless communication among the components of device  500 . Bus  510  may couple together two or more components of  FIG.  5   , such as via operative coupling, communicative coupling, electronic coupling, and/or electric coupling. Processor  520  includes a central processing unit, a graphics processing unit, a microprocessor, a controller, a microcontroller, a digital signal processor, a field-programmable gate array, an application-specific integrated circuit, and/or another type of processing component. Processor  520  is implemented in hardware, firmware, or a combination of hardware and software. In some implementations, processor  520  includes one or more processors capable of being programmed to perform one or more operations or processes described elsewhere herein. 
     Memory  530  includes volatile and/or nonvolatile memory. For example, memory  530  may include random access memory (RAM), read only memory (ROM), a hard disk drive, and/or another type of memory (e.g., a flash memory, a magnetic memory, and/or an optical memory). Memory  530  may include internal memory (e.g., RAM, ROM, or a hard disk drive) and/or removable memory (e.g., removable via a universal serial bus connection). Memory  530  may be a non-transitory computer-readable medium. Memory  530  stores information, instructions, and/or software (e.g., one or more software applications) related to the operation of device  500 . In some implementations, memory  530  includes one or more memories that are coupled to one or more processors (e.g., processor  520 ), such as via bus  510 . 
     Input component  540  enables device  500  to receive input, such as user input and/or sensed input. For example, input component  540  may include a touch screen, a keyboard, a keypad, a mouse, a button, a microphone, a switch, a sensor, a global positioning system sensor, an accelerometer, a gyroscope, and/or an actuator. Output component  550  enables device  500  to provide output, such as via a display, a speaker, and/or a light-emitting diode. Communication component  560  enables device  500  to communicate with other devices via a wired connection and/or a wireless connection. For example, communication component  560  may include a receiver, a transmitter, a transceiver, a modem, a network interface card, and/or an antenna. 
     Device  500  may perform one or more operations or processes described herein. For example, a non-transitory computer-readable medium (e.g., memory  530 ) may store a set of instructions (e.g., one or more instructions or code) for execution by processor  520 . Processor  520  may execute the set of instructions to perform one or more operations or processes described herein. In some implementations, execution of the set of instructions, by one or more processors  520 , causes the one or more processors  520  and/or the device  500  to perform one or more operations or processes described herein. In some implementations, hardwired circuitry may be used instead of or in combination with the instructions to perform one or more operations or processes described herein. Additionally, or alternatively, processor  520  may be configured to perform one or more operations or processes described herein. Thus, implementations described herein are not limited to any specific combination of hardware circuitry and software. 
     The number and arrangement of components shown in  FIG.  5    are provided as an example. Device  500  may include additional components, fewer components, different components, or differently arranged components than those shown in  FIG.  5   . Additionally, or alternatively, a set of components (e.g., one or more components) of device  500  may perform one or more functions described as being performed by another set of components of device  500 . 
       FIG.  6    is a flowchart of an example process  600  associated with semiconductor device and methods of manufacturing the same. In some implementations, one or more process blocks of  FIG.  6    may be performed by a one or more semiconductor processing tools (e.g., deposition tool  102 , etching tool  104 , planarization tool  106 , ion implantation tool  108 , and/or wafer/die transport tool  110 ). Additionally, or alternatively, one or more process blocks of  FIG.  6    may be performed by one or more components of device  500 , such as processor  520 , memory  530 , input component  540 , output component  550 , and/or communication component  560 . 
     As shown in  FIG.  6   , process  600  may include forming a set of fins of a device (block  610 ). For example, the one or more semiconductor processing tools may form a set of fins  220 ,  222 , and  224  of a device  200 , as described above. In some implementations, the set of fins comprises an isolation fin  224  disposed between a first fin  220  and a second fin  222  of the set of fins. 
     As further shown in  FIG.  6   , process  600  may include forming an isolation structure on at least one side of the isolation fin, the isolation fin providing electrical isolation between the first fin and the second fin of the set of fins (block  620 ). For example, the one or more semiconductor processing tools may form an isolation structure  246  on at least one side of the isolation fin  224 , the isolation fin  224  providing electrical isolation between the first fin  220  and the second fin  222  of the set of fins, as described above. 
     Process  600  may include additional implementations, such as any single implementation or any combination of implementations described below and/or in connection with one or more other processes described elsewhere herein. 
     In a first implementation, the a first source/drain region is disposed on the first fin  220  and a second source/drain region is disposed on the second fin  222 . 
     In a second implementation, alone or in combination with the first implementation, the first fin  220  and the second fin  222  have a first polarization and the isolation fin  224  has a second polarization that is opposite the first polarization. 
     In a third implementation, alone or in combination with one or more of the first and second implementations, the forming the isolation structure  246  comprises removing a portion of a dielectric layer  242  and a portion of a trench isolation structure  226  from the at least one side (e.g., from the multiple sides) of the isolation fin  224 , and depositing isolation material on the at least one side of the isolation fin  224  after removing the portion the dielectric layer  242  and the portion of the trench isolation structure  226 . 
     In a fourth implementation, alone or in combination with one or more of the first through third implementations, removing the portion of the trench isolation structure  226  from the at least one side (e.g., from multiple sides) of the isolation fin comprises removing the portion of the trench isolation structure  226  that is above a bottom surface of an anti-punch through layer  214  of the isolation fin  224 , and wherein depositing the isolation material on the at least one side of the isolation fin  224  comprises depositing the isolation material on at least one side of the anti-punch through layer  214  of the isolation fin  224 . 
     In a fifth implementation, alone or in combination with one or more of the first through fourth implementations, the isolation structure  246  extends from the isolation fin  224  to one or more dummy fins disposed between the isolation fin  224  and the first fin  220  or between the isolation fin  224  and the second fin  222 . 
     In a sixth implementation, alone or in combination with one or more of the first through fifth implementations, the isolation structure  246  extends above a top surface of the isolation fin  224 . 
     Although  FIG.  6    shows example blocks of process  600 , in some implementations, process  600  may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in  FIG.  6   . Additionally, or alternatively, two or more of the blocks of process  600  may be performed in parallel. 
       FIG.  7    is a flowchart of an example process  700  associated with semiconductor device and methods of manufacturing the same. In some implementations, one or more process blocks of  FIG.  7    may be performed by a one or more semiconductor processing tools (e.g., deposition tool  102 , etching tool  104 , planarization tool  106 , ion implantation tool  108 , and/or wafer/die transport tool  110 ). Additionally, or alternatively, one or more process blocks of  FIG.  7    may be performed by one or more components of device  500 , such as processor  520 , memory  530 , input component  540 , output component  550 , and/or communication component  560 . 
     As shown in  FIG.  7   , process  700  may include forming a first set of fins of a device, the first set of fins having a first polarity (block  710 ). For example, the one or more semiconductor processing tools may form a first set of fins  220  of a device  300 , the first set of fins  220  having a first polarity, as described above. 
     As further shown in  FIG.  7   , process  700  may include forming a second set of fins of the device, the second set of fins having a second polarity that is opposite the first polarity (block  720 ). For example, the one or more semiconductor processing tools may form a second set of fins  222  of the semiconductor device  300 , the second set of fins  222  having a second polarity that is opposite the first polarity, as described above. 
     As further shown in  FIG.  7   , process  700  may include forming a funnel-shaped isolation structure between the first set of fins and the second set of fins (block  730 ). For example, the one or more semiconductor processing tools may form a funnel-shaped isolation structure  306  between the first set of fins  220  and the second set of fins  222 , as described above. 
     Process  700  may include additional implementations, such as any single implementation or any combination of implementations described below and/or in connection with one or more other processes described elsewhere herein. 
     In a first implementation, the first set of fins  220  are formed on a first well  210  having the first polarity, wherein the second set of fins  222  are formed on a second well  302  having the second polarity, and wherein the funnel-shaped isolation structure  306  extends into an interface between the first well  210  and the second well  302  (e.g., the well  212  and/or a transition between the well  212  and one of the first well  210  and the second well  302 ). 
     In a second implementation, alone or in combination with the first implementation, the funnel-shaped isolation structure  306  comprises a material that includes one or more of silicon and nitrogen, silicon and carbon, aluminum and nitrogen, aluminum and oxygen, silicon, oxygen, and nitrogen, or oxygen, carbon, and nitrogen. 
     In a third implementation, alone or in combination with one or more of the first and second implementations, the forming the funnel-shaped isolation structure  306  comprises forming a recessed portion  304  of the semiconductor device  300  by removing a portion of a dielectric layer  242 , a portion of a trench isolation structure  226 , a portion of a well  212  associated with an isolation fin  224   
     In a fourth implementation, alone or in combination with one or more of the first through third implementations, the funnel-shaped isolation structure  306  has a first width within the dielectric layer  242 , wherein the funnel-shaped isolation structure  306  has a second width within the trench isolation structure  306 , the second width being less than the first width, and wherein the funnel-shaped isolation structure  306  has a third width between the first well  302  and the second well  210 , the third width being less than the second width. 
     In a fifth implementation, alone or in combination with one or more of the first through fourth implementations, the first set of fins  220  comprises a first set of source/drains having the first polarity, and wherein the second set of fins  222  comprises a second set of source/drains having the second polarity. 
     In a sixth implementation, alone or in combination with one or more of the first through fifth implementations, the funnel-shaped isolation structure  306  extends to a first height, relative to a substrate  302  of the semiconductor device  300 , that is greater than or equal to a second height, relative to the substrate  302  of the semiconductor device  300 , of the first set of fins  220 . 
     In a seventh implementation, alone or in combination with one or more of the first through sixth implementations, the funnel-shaped isolation structure  306  extends between dummy fins  250  formed between the first set of fins  220  and the second set of fins  222 . 
     Although  FIG.  7    shows example blocks of process  700 , in some implementations, process  700  may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in  FIG.  7   . Additionally, or alternatively, two or more of the blocks of process  700  may be performed in parallel. 
       FIG.  8    is a flowchart of an example process  800  associated with semiconductor device and methods of manufacturing the same. In some implementations, one or more process blocks of  FIG.  8    may be performed by a one or more semiconductor processing tools (e.g., deposition tool  102 , etching tool  104 , planarization tool  106 , ion implantation tool  108 , and/or wafer/die transport tool  110 ). Additionally, or alternatively, one or more process blocks of  FIG.  8    may be performed by one or more components of device  500 , such as processor  520 , memory  530 , input component  540 , output component  550 , and/or communication component  560 . 
     As shown in  FIG.  8   , process  800  may include forming a first gate structure extending from a well of a device (block  810 ). For example, the one or more semiconductor processing tools may form a first gate structure  412 A extending from a well  404  of a device  400 , as described above. 
     As further shown in  FIG.  8   , process  800  may include forming a second gate structure extending from the well  404  of the device (block  820 ). For example, the one or more semiconductor processing tools may form a second gate structure  412 B extending from the well  404  of the semiconductor device  400 , as described above. 
     As further shown in  FIG.  8   , process  800  may include forming, after forming the first gate structure and the second gate structure, an isolation structure between the first gate structure and the second gate structure, the isolation structure extending from the well to a first height, relative to a substrate of the device, that is greater than or equal to a second height, relative to the substrate of the device, of the first gate structure (block  830 ). For example, the one or more semiconductor processing tools may form, after forming the first gate structure  412 A and the second gate structure  412 B, an isolation structure  422  between the first gate structure  412 A and the second gate structure  412 B, the isolation structure  422  extending from the well  404  to a first height, relative to a substrate  402  of the semiconductor device  400 , that is greater than or equal to a second height, relative to the substrate  402  of the semiconductor device  400 , of the first gate structure  412 A, as described above. 
     Process  800  may include additional implementations, such as any single implementation or any combination of implementations described below and/or in connection with one or more other processes described elsewhere herein. 
     In a first implementation, forming the first gate structure  412 A comprises forming a fin  410  between source/drains  408  of the first gate structure  412 A, and forming a dummy gate structure  418  on the fin  410 . 
     In a second implementation, alone or in combination with the first implementation, the first gate structure  412 A and the second gate structure  412 B comprise nanostructure-based gate structures. 
     In a third implementation, alone or in combination with one or more of the first and second implementations, a first portion of the isolation structure  422 , formed at above a height of a source/drain  408  of the first gate structure  412 A, has a first width, wherein a second portion of the isolation structure  422 , formed below the height of the source/drain  408  of the first gate structure  412 A, has a second width, and wherein the second width is less than or equal to the first width. 
     In a fourth implementation, alone or in combination with one or more of the first through third implementations, forming the isolation structure  422  further comprises forming an outer portion  422 A of the isolation structure  422  comprising a first isolation material, and forming an inner portion  422 B of the isolation structure  422  comprising a second isolation material. 
     Although  FIG.  8    shows example blocks of process  800 , in some implementations, process  800  may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in  FIG.  8   . Additionally, or alternatively, two or more of the blocks of process  800  may be performed in parallel. 
     As described herein, an isolation structure may be a funnel-shaped isolation structure having a greatest width at an upper portion of the funnel-shaped isolation structure and a smallest width at a lower portion of the funnel-shaped isolation structure. In this way, the funnel-shaped isolation structure may provide a greatest electrical barrier at the upper portion of the funnel-shaped isolation structure, which may be disposed between portions of neighboring fins having n-doped or p-doped epitaxial material. 
     In some cases, the isolation structure may be formed on an isolation fin disposed between a first fin and a second fin. In this way, the isolation structure may have improved structural support based on bonding with the fin. 
     In some cases, the isolation structure may be formed between a first gate structure and a second gate structure, with the isolation structure extending to at least a height of the first gate structure and the second gate structure from a well below the first gate structure and the second gate structure. In this way, the isolation structure may provide isolation between gate structures without forming the isolation structure in place of a polysilicon structure that may be used for another gate and/or to improve a device density of the device. 
     In some implementations, the isolation structure may be a multi-layered isolation structure having layers with different N concentrations. In some implementations, the multi-layered isolation structure may be a fully stressed and dense semiconductor structure. Additionally, or alternatively, the isolation structure may be formed different levels of mechanical strength based on an atomic layer deposition process used to deposit layers of the isolation structure. 
     As described in greater detail above, some implementations described herein provide a method. The method includes forming a set of fins of a device, where the set of fins comprises an isolation fin disposed between a first fin and a second fin of the set of fins. The method also includes forming an isolation structure on at least one side of the isolation fin, with the isolation fin providing electrical isolation between the first fin and the second fin of the set of fins. 
     As described in greater detail above, some implementations described herein provide a method. The method includes forming a first set of fins of a device, the first set of fins having a first polarity. The method also includes forming a second set of fins of the device, with the second set of fins having a second polarity that is opposite the first polarity. The method further includes forming a funnel-shaped isolation structure between the first set of fins and the second set of fins. 
     As described in greater detail above, some implementations described herein provide a method. The method includes forming a first gate structure extending from a well of a device. The method includes forming a second gate structure extending from the well of the device. The method includes forming, after forming the first gate structure and the second gate structure, an isolation structure between the first gate structure and the second gate structure, the isolation structure extending from the well to a first height, relative to a substrate of the device, that is greater than or equal to a second height, relative to the substrate of the device, of the first gate structure. 
     The foregoing outlines features of several embodiments so that those skilled in the art may better understand the aspects of the present disclosure. Those skilled in the art should appreciate that they may readily use the present disclosure as a basis for designing or modifying other processes and structures for carrying out the same purposes and/or achieving the same advantages of the embodiments introduced herein. Those skilled in the art should also realize that such equivalent constructions do not depart from the spirit and scope of the present disclosure, and that they may make various changes, substitutions, and alterations herein without departing from the spirit and scope of the present disclosure.