Source: http://www.google.com/patents/US7875910?dq=5166694
Timestamp: 2016-07-30 15:26:58
Document Index: 646639463

Matched Legal Cases: ['Application No. 04716159', 'Application No. 10', 'Application No. 04716159', 'Application No. 200480005682', 'Application No. 10', 'Application No. 2006', 'Application No. 2006']

Patent US7875910 - Integrated nitride and silicon carbide-based devices - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA monolithic electronic device includes a first nitride epitaxial structure including a plurality of nitride epitaxial layers. The plurality of nitride epitaxial layers include at least one common nitride epitaxial layer. A second nitride epitaxial structure is on the common nitride epitaxial layer of...http://www.google.com/patents/US7875910?utm_source=gb-gplus-sharePatent US7875910 - Integrated nitride and silicon carbide-based devicesAdvanced Patent SearchPublication numberUS7875910 B2Publication typeGrantApplication numberUS 11/410,768Publication dateJan 25, 2011Filing dateApr 25, 2006Priority dateMar 3, 2003Fee statusPaidAlso published asCA2516916A1, CA2516916C, CN1757161A, CN100557966C, DE602004024764D1, EP1599938A2, EP1599938B1, US7112860, US8502235, US20040173816, US20060289901, US20110114968, WO2004079904A2, WO2004079904A3Publication number11410768, 410768, US 7875910 B2, US 7875910B2, US-B2-7875910, US7875910 B2, US7875910B2InventorsScott T. Sheppard, Adam William Saxler, Thomas SmithOriginal AssigneeCree, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (80), Non-Patent Citations (30), Referenced by (8), Classifications (20), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetIntegrated nitride and silicon carbide-based devices
US 7875910 B2Abstract
A monolithic electronic device includes a first nitride epitaxial structure including a plurality of nitride epitaxial layers. The plurality of nitride epitaxial layers include at least one common nitride epitaxial layer. A second nitride epitaxial structure is on the common nitride epitaxial layer of the first nitride epitaxial structure. A first plurality of electrical contacts is on the first epitaxial nitride structure and defines a first electronic device in the first nitride epitaxial structure. A second plurality of electrical contacts is on the first epitaxial nitride structure and defines a second electronic device in the second nitride epitaxial structure. A monolithic electronic device includes a bulk semi-insulating silicon carbide substrate having implanted source and drain regions and an implanted channel region between the source and drain regions, and a nitride epitaxial structure on the surface of the silicon carbide substrate. Corresponding methods are also disclosed.
a first type of nitride device including a first epitaxial nitride structure on the common nitride epitaxial layer;
a second type of nitride device, different from the first type of nitride device, including a second epitaxial nitride structure that is different from the first epitaxial nitride structure on the common nitride epitaxial layer;
a first plurality of electrical contacts on the first epitaxial nitride structure, the first plurality of contacts defining a first electronic device of the first type of nitride device; and
a second plurality of electrical contacts on the second epitaxial nitride structure, the second plurality of contacts defining a second electronic device of the second type of electronic device;
wherein the common epitaxial layer comprises a layer of semi-insulating AlxGa1-xN (0<x<1).
2. The monolithic electronic device of claim 1, wherein the first epitaxial nitride structure comprises:
3. The monolithic electronic device of claim 2, further comprising a high bandgap layer on the barrier layer and a silicon nitride layer on the high bandgap layer.
4. The monolithic electronic device of claim 1, wherein the second nitride epitaxial structure comprises a layer of AlxGa1-xN (0≦x≦1) having a thickness of about 300 Å to about 1000 Å.
5. The monolithic electronic device of claim 1, wherein the first electronic device comprises a high electron mobility transistor.
6. The monolithic electronic device of claim 5, wherein the second electronic device comprises a surface acoustic wave device.
7. The monolithic electronic device of claim 5, wherein the second electronic device comprises a diode.
8. The monolithic electronic device of claim 5, wherein the second electronic device comprises a field effect transistor.
9. The monolithic electronic device of claim 8, wherein the second electronic device includes source, drain and gate contacts, and wherein the gate and drain contacts of the second electronic device are electrically coupled to form an anode.
10. The monolithic electronic device of claim 9, wherein the second epitaxial nitride structure comprises a first layer of n-type AlxGa1-xN (0≦x≦1) on the first epitaxial nitride structure and a second layer of n-type AlxGa1-xN (0≦x≦1) on the first layer of n-type AlxGa1-xN (0≦x≦1), wherein the first layer of n-type AlxGa1-xN (0≦x≦1) has a surface charge density of about 1�1014 cm−2, and the second layer of n-type AlxGa1-xN (0≦x≦1) has a doping concentration of less than about 1�1016 cm−3.
11. The monolithic electronic device of claim 5, wherein the second electronic device comprises a MISHFET. Description
This application claims priority under 35 U.S.C. �120 as a continuation-in-part application of U.S. patent application Ser. No. 10/378,331, filed on Mar. 3, 2003 now U.S. Pat. No. 7,112,860, the disclosure of which is hereby incorporated by reference herein as if set forth in its entirety.
where ν is the SAW velocity and λ is the wavelength. As discussed above, the wavelength of the device is determined by the finger period of the IDT. The width and spacing of IDT fingers (and thus the finger period) is limited by the resolution of photolithographic techniques. Thus, for a given finger period, increasing the SAW velocity increases the fundamental operating frequency of the device. Stated differently, having a higher SAW velocity permits a device to process higher-frequency signals for a given device geometry. Accordingly, the Group III-nitrides and SiC may be desirable piezoelectric materials for the fabrication of SAW devices.
The integrated device 10 includes a substrate 12 that may, for example, be silicon carbide (SiC), such as semi-insulating silicon carbide of the 4H polytype. Other silicon carbide candidate polytypes include the 3C, 6H, and 15R polytypes. The term “semi-insulating” is used descriptively rather than in an absolute sense. In particular embodiments of the present invention, the silicon carbide bulk crystal has a resistivity equal to or higher than about 1�105 Ω-cm at room temperature.
The barrier 18 and the channel 16 layers may be etched using a dry etch process such as reactive ion etching (RIE). Suitable conditions for dry etching the mesa may include dry etching in an Ar environment using BCl3 etchant. For example, a typical process may include flowing Ar at 20-100 sccm and BCl3 at 10-20 sccm in an RIE reactor at a pressure of 5-50 mTorr and an RF power at 50-300W. Actual parameters will depend on the system used and may be determined by those skilled in the art. The etch should be highly selective to etch GaN but not AlN.
An alternative method of fabricating device 10 may be understood with reference to the precursor structure 13 shown in FIG. 1C. The device 10 may be fabricated by placing the substrate 12 into a growth reactor and depositing the AlN buffer layer 14 on the substrate 12 as described above. After formation of the buffer layer 14, the substrate 12 is removed from the growth reactor and a growth mask 34 (which may comprise silicon dioxide, silicon nitride or another suitable material) is formed on the surface of the buffer layer. The mask layer 34 is patterned using standard photolithographic techniques as described above to reveal a portion of the surface of the buffer layer 14. After formation and patterning of the mask layer 34, the substrate 12 is placed back into a growth reactor for the regrowth of channel and the barrier layer 18 and the channel layer 16 (and any other layers that may be present in the device). The contacts 22, 23, 24 and the IDTs 26, 28 may then be formed on the structure after removal of the mask layer 34.
As illustrated in FIG. 2A, the trench 36 may be formed before, during or after formation of the transistor. For example, an etch mask 38 may be formed on the structure and patterned to reveal a portion of the buffer layer 14 adjacent the transistor mesa. The exposed region is then etched in the manner described above to provide device isolation. After etching, the etch mask is removed and metallization is performed as illustrated in FIG. 2B.
FIGS. 3A-3B illustrate other embodiments of the invention. As FIG. 3A schematically illustrates, a device 30 includes a transistor structure 30A and a SAW device structure 30B formed on a common substrate. However, in this embodiment, the IDTs 26, 28 of the SAW device 30B are formed on the surface of the same epitaxial layer as the transistor electrodes, thus avoiding the need for regrowth or mesa etching.
As discussed above, because of the AlGaN/GaN heterobarrier at the interface between the channel layer 104 and the barrier layer 106, a two dimensional electron gas may be induced at the interface.
Following the selective etching of the high purity silicon nitride layer, the photoresist mask 210 may be removed, and a epitaxial layer 125 may be epitaxially regrown on the exposed high bandgap layer 108. The epitaxial layer 125 may be similar to the epitaxial layer 112 shown in FIG. 13A. For example, the epitaxial layer 125 may include doped GaN and/or graded AlGaN, and may have a thickness of about 30 Å to about 1000 Å.
It will be appreciated that the second transistor Q4 may be configured as a two terminal device, such as a limiter diode, by electrically connecting the gate contact 140 and the drain contact 144. When so configured, the gate and drain contacts 140, 144 together function as a device anode, while the source contact 142 may function as a device cathode. A limiter diode may be used, for example, as an input to an amplifier transistor, such as the first transistor Q3.
Embodiments of the present invention may provide both enhancement and depletion mode nitride-based transistor devices on a common substrate. For example, a depletion mode device may be formed by providing an epitaxial structure, such as the Type I epitaxial structure shown in FIG. 12A, and forming ohmic contacts thereto as described in connection with FIG. 14C. An enhancement mode device may be formed using the same epitaxial structure, but by recessing the gate contact into the underlying high bandgap layer 108.
According to some embodiments of the invention, a silicon carbide MESFET may be formed on an on-axis substrate by implanting source/drain regions as well as a channel region in an on-axis semi-insulating silicon carbide substrate, as illustrated in FIGS. 17A and 17B. As shown therein, one or more implant regions may be formed in an on-axis, semi-insulating 4H—SiC substrate by means of ion implantation. For example, as shown in FIG. 17A, an n-type channel region 216 may be formed in the substrate 200 by selective implantation of nitrogen and/or phosphorus ions. Furthermore, n+ source/drain regions 212, 214 may be formed in the substrate 200 by ion implantation. Multiple implantation steps with different implant energies/doses may be performed in order to provide a desired doping profile. Implantation of dopants into bulk silicon carbide layers is known in the art. After implantation, the dopants may be activated by annealing the implanted structure at a temperature of about 1400� C. to about 1700� C. for about 5 minutes to about 30 minutes. In particular, it may be desirable to activate the implanted dopants prior to epitaxial growth of nitride layers on the substrate 200, as the temperatures required to activate dopants implanted in silicon carbide may be detrimental to nitride-based epitaxial layers.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS3955160Apr 30, 1975May 4, 1976Rca CorporationSurface acoustic wave deviceUS4742315 *Apr 28, 1987May 3, 1988Siemens AktiengesellschaftIntegrated NMOS circuitUS4912063Oct 26, 1987Mar 27, 1990North Carolina State UniversityGrowth of beta-sic thin films and semiconductor devices fabricated thereonUS4912064Oct 26, 1987Mar 27, 1990North Carolina State UniversityHomoepitaxial growth of alpha-SiC thin films and semiconductor devices fabricated thereonUS4946547Oct 13, 1989Aug 7, 1990Cree Research, Inc.Method of preparing silicon carbide surfaces for crystal growthUS5011549Oct 16, 1989Apr 30, 1991North Carolina State UniversityHomoepitaxial growth of Alpha-SiC thin films and semiconductor devices fabricated thereonUS5155062Dec 20, 1990Oct 13, 1992Cree Research, Inc.Method for silicon carbide chemical vapor deposition using levitated wafer systemUS5200022Oct 3, 1990Apr 6, 1993Cree Research, Inc.Method of improving mechanically prepared substrate surfaces of alpha silicon carbide for deposition of beta silicon carbide thereon and resulting productUS5210051Jun 5, 1991May 11, 1993Cree Research, Inc.High efficiency light emitting diodes from bipolar gallium nitrideUS5265267Aug 29, 1991Nov 23, 1993Motorola, Inc.Integrated circuit including a surface acoustic wave transformer and a balanced mixerUS5270554Jun 14, 1991Dec 14, 1993Cree Research, Inc.High power high frequency metal-semiconductor field-effect transistor formed in silicon carbideUS5292501Apr 26, 1993Mar 8, 1994Degenhardt Charles RUse of a carboxy-substituted polymer to inhibit plaque formation without tooth stainingUS5393993Dec 13, 1993Feb 28, 1995Cree Research, Inc.Buffer structure between silicon carbide and gallium nitride and resulting semiconductor devicesUS5405797 *Mar 30, 1994Apr 11, 1995Daimler-Benz AgMethod of producing a monolithically integrated millimeter wave circuitUS5523589Sep 20, 1994Jun 4, 1996Cree Research, Inc.Vertical geometry light emitting diode with group III nitride active layer and extended lifetimeUS5576589Oct 13, 1994Nov 19, 1996Kobe Steel Usa, Inc.Diamond surface acoustic wave devicesUS5592501Sep 20, 1994Jan 7, 1997Cree Research, Inc.Low-strain laser structures with group III nitride active layersUS5739554May 8, 1995Apr 14, 1998Cree Research, Inc.Double heterojunction light emitting diode with gallium nitride active layerUS6063186Dec 17, 1997May 16, 2000Cree, Inc.Growth of very uniform silicon carbide epitaxial layersUS6217662Mar 24, 1997Apr 17, 2001Cree, Inc.Susceptor designs for silicon carbide thin filmsUS6218680May 18, 1999Apr 17, 2001Cree, Inc.Semi-insulating silicon carbide without vanadium dominationUS6265727Jun 9, 1999Jul 24, 2001Cree Lighting CompanySolar blind photodiode having an active region with a larger bandgap than one or both if its surrounding doped regionsUS6285866Jun 21, 1999Sep 4, 2001Korea Advanced Institute Of Science & TechnologySingle-chip radio structure with piezoelectric crystal device integrated on monolithic integrated circuit and method of fabricating the sameUS6297522Feb 11, 2000Oct 2, 2001Cree, Inc.Highly uniform silicon carbide epitaxial layersUS6300706Jul 14, 1999Oct 9, 2001The United States Of America As Represented By The Secretary Of The ArmyCompound semiconductor monolithic frequency sources and actuatorsUS6316793Jun 12, 1998Nov 13, 2001Cree, Inc.Nitride based transistors on semi-insulating silicon carbide substratesUS6377138Jul 28, 1998Apr 23, 2002Kabushiki Kaisha ToshibaSurface acoustic wave device with a layered conductive film and method of producing the sameUS6396080May 25, 2001May 28, 2002Cree, IncSemi-insulating silicon carbide without vanadium dominationUS6403982Jan 10, 2001Jun 11, 2002Cree, Inc.Semi-insulating silicon carbide without vanadium dominationUS6495852Jun 19, 2000Dec 17, 2002Sharp Kabushiki KaishaGallium nitride group compound semiconductor photodetectorUS6518637Apr 7, 2000Feb 11, 2003Wayne State UniversityCubic (zinc-blende) aluminum nitrideUS6530990Feb 21, 2001Mar 11, 2003Cree, Inc.Susceptor designs for silicon carbide thin filmsUS6548333Jul 12, 2001Apr 15, 2003Cree, Inc.Aluminum gallium nitride/gallium nitride high electron mobility transistors having a gate contact on a gallium nitride based cap segmentUS6555946Jul 24, 2000Apr 29, 2003Motorola, Inc.Acoustic wave device and process for forming the sameUS6596079Mar 13, 2000Jul 22, 2003Advanced Technology Materials, Inc.III-V nitride substrate boule and method of making and using the sameUS6686616May 10, 2000Feb 3, 2004Cree, Inc.Silicon carbide metal-semiconductor field effect transistorsUS6797069Apr 8, 2002Sep 28, 2004Cree, Inc.Gas driven planetary rotation apparatus and methods for forming silicon carbide layersUS6849882 *Mar 19, 2002Feb 1, 2005Cree Inc.Group-III nitride based high electron mobility transistor (HEMT) with barrier/spacer layerUS7045404Jan 16, 2004May 16, 2006Cree, Inc.Nitride-based transistors with a protective layer and a low-damage recess and methods of fabrication thereofUS7112860 *Mar 3, 2003Sep 26, 2006Cree, Inc.Integrated nitride-based acoustic wave devices and methods of fabricating integrated nitride-based acoustic wave devicesUS7230284 *Jul 23, 2002Jun 12, 2007Cree, Inc.Insulating gate AlGaN/GaN HEMTUS7294540 *Mar 31, 2005Nov 13, 2007Samsung Electro-Mechanics Co., Ltd.Method for manufacturing a nitride based semiconductor deviceUS20010035695Apr 24, 2001Nov 1, 2001Murata Manufacturing Co., Ltd.Surface acoustic wave device, shear bulk wave transducer, and longitudinal bulk wave transducerUS20020090454Jan 8, 2001Jul 11, 2002Michael PaisleyGas-driven rotation apparatus and method for forming silicon carbide layersUS20020113668Feb 14, 2002Aug 22, 2002Sanyo Electric Co., Ltd.Longitudinal coupled multiple mode surface acoustic wave filterUS20020158707Mar 26, 2002Oct 31, 2002Kazushige NoguchiSurface-acoustic-wave duplexer with improved isolationUS20020167023Mar 19, 2002Nov 14, 2002Cree Lighting Company And Regents Of The University Of CaliforniaGroup-III nitride based high electron mobility transistor (HEMT) with barrier/spacer layerUS20020170491May 21, 2001Nov 21, 2002Stephan MuellerSeed crystal holders and seed crystals for fabricating silicon carbide crystals and methods of fabricating silicon carbide crystalsUS20030022412 *Jul 25, 2001Jan 30, 2003Motorola, Inc.Monolithic semiconductor-piezoelectric device structures and electroacoustic charge transport devicesUS20030030119Aug 13, 2001Feb 13, 2003Motorola, Inc.Structure and method for improved piezo electric coupled component integrated devicesUS20030205721 *Mar 21, 2001Nov 6, 2003Katsunori NishiiSemiconductor device having an active region formed from group III nitrideUS20040007715 *Jul 9, 2002Jan 15, 2004Webb Douglas A.Heterojunction field effect transistors using silicon-germanium and silicon-carbon alloysUS20050051793Aug 6, 2004Mar 10, 2005Hidetoshi IshidaSwitching semiconductor device and switching circuitUS20060065929Mar 31, 2005Mar 30, 2006Samsung Electro-Mechanics Co., Ltd.Nitride based semiconductor device and method for manufacturing the sameUS20060081897Sep 6, 2005Apr 20, 2006The Furukawa Electric Co., Ltd.GaN-based semiconductor integrated circuitUS20060108660Nov 15, 2005May 25, 2006Eudyna Devices Inc.Amplifier circuit, control method of the same, and amplifier circuit moduleUS20070018199Jul 20, 2005Jan 25, 2007Cree, Inc.Nitride-based transistors and fabrication methods with an etch stop layerUS20070018210Jul 21, 2005Jan 25, 2007Cree, Inc.Switch mode power amplifier using MIS-HEMT with field plate extensionUS20070158683Dec 13, 2005Jul 12, 2007Sheppard Scott TSemiconductor devices including implanted regions and protective layers and methods of forming the sameUS20080169474Mar 19, 2008Jul 17, 2008Cree, Inc.Integrated Nitride and Silicon Carbide-Based Devices and Methods of Fabricating Integrated Nitride-Based DevicesUSRE34861Oct 9, 1990Feb 14, 1995North Carolina State UniversitySublimation of silicon carbide to produce large, device quality single crystals of silicon carbideCN1309816AJun 2, 1999Aug 22, 2001克里公司Nitride based transistors on semi-insulating silicon carbide substratesEP0373606A1Dec 12, 1989Jun 20, 1990United TechnologiesA monolithic electro-acoustic device having an acoustic charge transport device integrated with a transistorEP0810726B1Feb 16, 1996Jul 20, 2005Asahi Kasei Kabushiki KaishaElastic surface wave functional device and electronic circuit using the elementEP1643561A2Sep 23, 2005Apr 5, 2006The Furukawa Electric Co., Ltd.GaN-based semiconductor integrated circuitEP1734647A1Aug 26, 2005Dec 20, 2006Matsushita Electric Industrial Co., Ltd.Semiconductor device and module using the sameEP1798762A2Dec 13, 2006Jun 20, 2007Cree Inc.Semiconductor devices including implanted regions and protective layers and methods of forming the sameGB2338107A Title not availableJP05183381A Title not availableJP58197910A Title not availableJP2000150417A Title not availableJPH02214321A Title not availableJPH05183381A Title not availableJPH06303088A Title not availableJPS58197910A Title not availableKR19980702240A Title not availableKR20000005908A Title not availableKR20000068639A Title not availableKR20020087414A Title not availableWO2004079904A2Mar 1, 2004Sep 16, 2004Cree, Inc.Integrated nitride-based acoustic wave devices and methods of fabricating integrated nitride-based acoustic wave devices* Cited by examinerNon-Patent CitationsReference1Communication Pursuant to Article 94(3) EPC (4 pages) corresponding to European Application No. 04716159.1; Mailing Date: Nov. 24, 2008.2 *Eickhoff et al. ("Novel Sensor Applications of Group-III Nitrides", Materials Research Society Symposium Proceedings, vol. 693, p. 781-792 (2002); XP009035257).3English Translation of Office Action corresponding to Korean Patent Application No. 10-2005-7016258, 4 pages.4European Office Action for European Patent Application No. 04716159.1; Oct. 24, 2007.5First Office Action, Chinese Application No. 200480005682.X, Issued Jul. 11, 2008.6Hagon et al Integrated programmable analog matched filters for spread spectrum applications IEEE Ultrasonics Symposium, Monterey, CA, USA 333-335 (1983).7Hagon et al. "Integrated Programmable Analog Matched Filters for Spread Spectrum Applications," IEEE Ultrasonics Symposium, 1973, pp. 333-335.8Hagon et al., "Integrated Programmable Analog Matched Filters for Spread Spectrum Applications," 1973 Ultrasonics Symposium Proceedings, IEEE, pp. 333-335, USA, 1973.9International Search Report and Written Opinion (15 pages) corresponding to International Application No. PCT/US2009/000802; Mailing Date: Jun. 3, 2009.10International Search Report and Written Opinion for PCT US2004/006232; date of mailing Nov. 11, 2004.11Invitation to Pay Additional Fees issued Aug. 31, 2004 for corresponding PCT application No. PCT/US2004/006232.12M. Eickhoff et al., "Novel Sensor Applications of group-III nitrides", Materials Research Society Symposium Proceedings, vol. 693, pp. 781-792 (2002); XP009035257.13Ng, K.N., "Interdigital Transducer", Complete Guide to Semiconductor Devices, Ch. 66 (2000) pp. 511-516.14Office Action corresponding to Korean Patent Application No. 10-2005-7016258 dated Oct. 8, 2010; 4 pages.15Office Notice of Rejection, Mar. 2, 2010, Japanese Patent Application No. 2006-508961, 9 pages.16Official Notice of Rejection, mailed on Aug. 6, 2010, JP Patent Application No. 2006-508961, 8 pages.17Sheppard et al., "High Power Demonstration at 10 GHz with GaN/AlGaN HEMT Hybrid Amplifiers", Presented at the 58th DRC, Denver, CO (Jun. 2000) 20 pages.18Sheppard et al., "Improved 10-GHz Operation of GaN/AlGaN HEMTs on Silicon Carbide", Materials Science Forum, vols. 338-342 (2000) pp. 1643-1646.19Stutzmann et al. "GaN-based heterostructures for sensor applications" Diamond and Related Materials 11(3-6):886-891 (2002).20Stutzmann et al. "GaN-based heterostructures for sensor applications," Diamond and Related Materials, vol. 11, No. 3-6, Mar. 2002, pp. 886-891.21Takagaki et al. "Superhigh-frequency surface-acoustic-wave transducers using AIN layers grown on SiC substrates" Applied Physics Letters 81(14):2538-2540 (2002).22Takagaki et al. "Superhigh-frequency surface-acoustic-wave transducers using AIN layers grown on SiC substrates," Applied Physics Letters, vol. 81, No. 14, Sep. 30, 2002, pp. 2538-2540.23Tsubouchi et al. " Zero Temperature Coefficient Saw Delay Line on A1N Epitaxial Films", Research Institute of Electrical Communication, Tohoku Univ., Katahira 2-1-1, Sendai 980, Japan; 1983 Ultrasonics Symposium; pp. 299-310.24Tsubouchi et al. "Zero Temperature Coefficient Saw Delay Line on AIN Epitaxial Films," IEEE Ultrasonics Symposium, Atlanta, GA, 1983, pp. 299-310.25Tsubouchi et al. Zero temperature coefficient SAW delay line on AIN epitaxial films: IEEE Ultrasonics Symposium, Atlanta, GA, USA 299-310 (1983).26Tsubouchi et al., "Zero Temperature Coefficient Saw Delay Line on AIN Epitaxial Films," 1983 Ultrasonics Symposium Proceedings, IEEE, pp. 299-310, USA, 1983.27U.S. Appl. No. 11/286,805, filed Nov. 23, 2005, Saxler et al.28U.S. Patent Application for Gas Driven Planetary Rotation Apparatus and Methods for Forming Silicon Carbide Layer, U.S. Appl. No. 10/117,858, filed Apr. 8, 2002.29U.S. Patent Application for Induction Heating Devices and Methods for Controllably Heating an Article, U.S. Appl. No. 10/017,492, filed Oct. 30, 2001.30U.S. Patent Application for Susceptor Designs for Silicon Carbide Thin Films, U.S. Appl. No. 09/715,576, filed Mar. 3, 2003.* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS8796736 *May 17, 2013Aug 5, 2014Hrl Laboratories, LlcMonolithic integration of group III nitride epitaxial layersUS9093366Apr 9, 2013Jul 28, 2015Transphorm Inc.N-polar III-nitride transistorsUS9171836Sep 5, 2014Oct 27, 2015Transphorm Inc.Method of forming electronic components with increased reliabilityUS9245992Mar 13, 2014Jan 26, 2016Transphorm Inc.Carbon doping semiconductor devicesUS9245993Mar 13, 2014Jan 26, 2016Transphorm Inc.Carbon doping semiconductor devicesUS9318593Nov 17, 2014Apr 19, 2016Transphorm Inc.Forming enhancement mode III-nitride devicesUS9362887Jul 10, 2015Jun 7, 2016Akoustis, Inc.Integrated circuit configured with two or more single crystal acoustic resonator devicesUS9378949Jun 23, 2014Jun 28, 2016Hrl Laboratories, LlcMonolithic integration of group III nitride epitaxial layers* Cited by examinerClassifications U.S. Classification257/256International ClassificationH03H9/05, H01L21/338, H03H9/02, H01L29/80, H03H9/145, H03H3/08, H01L27/20Cooperative ClassificationH01L27/20, H03H9/02228, H03H9/02574, H03H9/02976, H03H9/0542, H03H3/08European ClassificationH03H9/02S2E, H03H9/05B1, H03H3/08, H03H9/02S10C, H01L27/20, H03H9/02GLegal EventsDateCodeEventDescriptionAug 25, 2006ASAssignmentOwner name: CREE, INC., NORTH CAROLINAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SHEPPARD, SCOTT T.;SAXLER, ADAM WILLIAM;SMITH, THOMAS;REEL/FRAME:018185/0946;SIGNING DATES FROM 20060509 TO 20060817Owner name: CREE, INC., NORTH CAROLINAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SHEPPARD, SCOTT T.;SAXLER, ADAM WILLIAM;SMITH, THOMAS;SIGNING DATES FROM 20060509 TO 20060817;REEL/FRAME:018185/0946Jun 25, 2014FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services