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Class Information
Number: 257/26
Name: Active solid-state devices (e.g., transistors, solid-state diodes) > Thin active physical layer which is (1) an active potential well layer thin enough to establish discrete quantum energy levels or (2) an active barrier layer thin enough to permit quantum mechanical tunneling or (3) an active layer thin enough to permit carrier transmission with substantially no scattering (e.g., superlattice quantum well, or ballistic transport device) > Heterojunction > Ballistic transport device
Description: Subject matter in which an active layer is present through which carriers pass, wherein the active layer is thinner than the mean free path of the carriers in the material in that layer, so that carriers can pass through the layer without scattering.

Sub-classes under this class:

Class Number Class Name Patents
257/27 Field effect transistor 154

Patents under this class:
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Patent Number Title Of Patent Date Issued
8634442 Optical device structure using GaN substrates for laser applications Jan. 21, 2014
8624223 Side-gate defined tunable nanoconstriction in double-gated graphene multilayers Jan. 7, 2014
8575624 Semiconductor device Nov. 5, 2013
8558218 Methods of forming carbon nanotubes architectures and composites with high electrical and thermal conductivites and structures formed thereby Oct. 15, 2013
8422525 Optical device structure using miscut GaN substrates for laser applications Apr. 16, 2013
8421231 Electrically conductive composite Apr. 16, 2013
8217384 Device and method for manipulating direction of motion of current carriers Jul. 10, 2012
8178946 Modulation doped super-lattice base for heterojunction bipolar transistors May. 15, 2012
8158968 Methods of forming carbon nanotubes architectures and composites with high electrical and thermal conductivities and structures formed thereby Apr. 17, 2012
8044388 Method of forming a carbon nanotube-based contact to semiconductor Oct. 25, 2011
8035116 Semiconductor device, light emitting diode head, and image forming apparatus Oct. 11, 2011
7875876 Scalable quantum computer Jan. 25, 2011
7732807 Integrated circuit Jun. 8, 2010
7679076 Optical semiconductor device and method of manufacturing the same Mar. 16, 2010
7576353 Ballistic deflection transistor and logic circuits based on same Aug. 18, 2009
7414261 Ballistic semiconductor device Aug. 19, 2008
7115942 Method and apparatus for nonvolatile memory Oct. 3, 2006
6727530 Integrated photodetector and heterojunction bipolar transistors Apr. 27, 2004
6566694 Heterojunction bipolar transferred electron tetrode May. 20, 2003
6518589 Dual mode FET & logic circuit having negative differential resistance mode Feb. 11, 2003
6420727 Light-emitting semiconductor device with quantum-wave interference layers Jul. 16, 2002
6417520 Semiconductor device with quantum-wave interference layers Jul. 9, 2002
6403874 High-efficiency heterostructure thermionic coolers Jun. 11, 2002
6323414 Heterostructure thermionic coolers Nov. 27, 2001
6303940 Charge injection transistor using high-k dielectric barrier layer Oct. 16, 2001
6255674 Silicon-germanium heterobipolar transistor with a step-wise graded base Jul. 3, 2001
6201258 Hot carrier transistors utilizing quantum well injector for high current gain Mar. 13, 2001
6097036 Semiconductor logic element and apparatus using thereof Aug. 1, 2000
6091077 MIS SOI semiconductor device with RTD and/or HET Jul. 18, 2000
5955772 Heterostructure thermionic coolers Sep. 21, 1999
5907159 Hot electron device and a resonant tunneling hot electron device May. 25, 1999
5773842 Resonant-tunnelling hot electron transistor Jun. 30, 1998
5712491 Lateral theta device Jan. 27, 1998
5675157 Transferred electron effect device Oct. 7, 1997
5640022 Quantum effect device Jun. 17, 1997
5543749 Resonant tunneling transistor Aug. 6, 1996
5459334 Negative absolute conductance device and method Oct. 17, 1995
5448087 Heterojunction bipolar transistor with graded base doping Sep. 5, 1995
5442194 Room-temperature tunneling hot-electron transistor Aug. 15, 1995
5436469 Band minima transistor Jul. 25, 1995
5418375 Soft proton isolation process for an acoustic charge transport integrated circuit May. 23, 1995
5386126 Semiconductor devices based on optical transitions between quasibound energy levels Jan. 31, 1995
5381027 Semiconductor device having a heterojunction and a two dimensional gas as an active layer Jan. 10, 1995
5369288 Semiconductor device for switching a ballistic flow of carriers Nov. 29, 1994
5367274 Quantum wave guiding electronic switch Nov. 22, 1994
5350931 Double barrier resonant propagation filter Sep. 27, 1994
5349202 Tunneling transistor Sep. 20, 1994
5329145 Heterojunction bipolar transistor and its integration method Jul. 12, 1994
5304816 Article comprising a "ballistic" heterojunction bipolar transistor Apr. 19, 1994
5279162 Semiconductor sensor Jan. 18, 1994

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