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Class Information
Number: 257/194
Name: Active solid-state devices (e.g., transistors, solid-state diodes) > Heterojunction device > Field effect transistor > Doping on side of heterojunction with lower carrier affinity (e.g., high electron mobility transistor (hemt))
Description: Subject matter wherein the heterojunction field effect transistor has impurity dopant on the side of the heterojunction with lower affinity for the charge carriers (holes or










Sub-classes under this class:

Class Number Class Name Patents
257/195 Combined with diverse type device 244


Patents under this class:
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Patent Number Title Of Patent Date Issued
7038253 GaN-based field effect transistor of a normally-off type May. 2, 2006
7030428 Strain balanced nitride heterojunction transistors Apr. 18, 2006
7026665 High voltage GaN-based transistor structure Apr. 11, 2006
7015518 HEMT device with a mesa isolating multilayer film Mar. 21, 2006
7011997 Method of fabricating a HEMT device Mar. 14, 2006
7012274 Modulation doped thyristor and complementary transistors combination for a monolithic optoelectronic integrated circuit Mar. 14, 2006
7012286 Heterojunction field effect transistor Mar. 14, 2006
7012287 HEMT device with a mesa isolating multilayer film Mar. 14, 2006
7009209 Silicon carbide and related wide-bandgap transistors on semi-insulating epitaxy for high-speed, high-power applications Mar. 7, 2006
6995397 Semiconductor device Feb. 7, 2006
6992337 Gallium arsenide antimonide (GaAsSB)/indium phosphide (InP) heterojunction bipolar transistor (HBT) having reduced tunneling probability Jan. 31, 2006
6989553 Semiconductor device having an active region of alternating layers Jan. 24, 2006
6987484 Detector for electromagnetic radiation and a method of detecting electromagnetic radiation Jan. 17, 2006
6984853 Integrated circuit with enhancement mode pseudomorphic high electron mobility transistors having on-chip electrostatic discharge protection Jan. 10, 2006
6982440 Silicon carbide semiconductor devices with a regrown contact layer Jan. 3, 2006
6982441 Semiconductor device with a super lattice buffer Jan. 3, 2006
6972440 Enhanced T-gate structure for modulation doped field effect transistors Dec. 6, 2005
6972461 Channel MOSFET with strained silicon channel on strained SiGe Dec. 6, 2005
6969875 Buried channel strained silicon FET using a supply layer created through ion implantation Nov. 29, 2005
6963090 Enhancement mode metal-oxide-semiconductor field effect transistor Nov. 8, 2005
6953954 Plasma oscillation switching device Oct. 11, 2005
6953955 InGaAs/GaAs high electron mobility transistor Oct. 11, 2005
6951821 Processing system and method for chemically treating a substrate Oct. 4, 2005
6943386 Pseudomorphic high electron mobility field effect transistor with high device linearity Sep. 13, 2005
6936865 Visible light transmitting structure with photovoltaic effect Aug. 30, 2005
6936870 Heterojunction type compound semiconductor field effect transistor and its manufacturing method Aug. 30, 2005
6936900 Integrated transistor devices Aug. 30, 2005
6933181 Method for fabricating semiconductor device Aug. 23, 2005
6933543 Compound semiconductor high frequency switch device Aug. 23, 2005
6933544 Power semiconductor device Aug. 23, 2005
6927414 High speed lateral heterojunction MISFETs realized by 2-dimensional bandgap engineering and methods thereof Aug. 9, 2005
6924516 Semiconductor device Aug. 2, 2005
6919589 HEMT with a graded InGaAlP layer separating ohmic and Schottky contacts Jul. 19, 2005
6914273 GaN-type enhancement MOSFET using hetero structure Jul. 5, 2005
6903383 Semiconductor device having a high breakdown voltage for use in communication systems Jun. 7, 2005
6903385 Semiconductor structure having a textured nitride-based layer Jun. 7, 2005
6897495 Field effect transistor and manufacturing method therefor May. 24, 2005
6894362 Method and apparatus for a self-aligned heterojunction bipolar transistor using dielectric assisted metal liftoff process May. 17, 2005
6878593 Metal oxide semiconductor heterostructure field effect transistor Apr. 12, 2005
6878977 Photoelectric conversion device, and image sensor and image input system making use of the same Apr. 12, 2005
6876011 Semiconductor device Apr. 5, 2005
6876012 Hetero-bipolar transistor Apr. 5, 2005
6872966 Optical semiconductor device Mar. 29, 2005
6872985 Waveguide-bonded optoelectronic devices Mar. 29, 2005
6870203 Field-effect semiconductor device and method for making the same Mar. 22, 2005
6867078 Method for forming a microwave field effect transistor with high operating voltage Mar. 15, 2005
6867439 Field-effect transistor using a group III-V compound semiconductor Mar. 15, 2005
6861679 Gallium indium nitride arsenide based epitaxial wafer, a hetero field effect transistor using the wafer, and a method of fabricating the hetero field effect transistor Mar. 1, 2005
6852615 Ohmic contacts for high electron mobility transistors and a method of making the same Feb. 8, 2005
6853016 Semiconductor device and method of fabricating semiconductor device Feb. 8, 2005

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