摘要:
A complementary heterojunction semiconductor device (10) has a first resonant interband tunneling transistor (12) coupled to a second resonant interband tunneling transistor (14) through a common output (16). The first transistor (12) has a first gate (18) of a first semiconductor type and a drain (28) coupled to the first gate (18). The first gate (18) is also coupled to the common output (16). The second transistor (14) has a second gate (32) of a second semiconductor type and a source (42) coupled to the second gate (32). The second gate (32) is also coupled to the common output (16). The valence band (60,80,82) of the first semiconductor type has an energy level greater than the conduction band (62,64,84) of the second semiconductor type.
摘要:
A semiconductor structure that provides both N-type and P-type doping from a single dopant source is provided. A first doping region (13) comprising a first material composition includes holes and electrons in a doping energy level (E.sub.D)- A first undoped spacer region (12) comprising the first material composition covers the doping region (13). An undoped channel (11,14) comprising a second material composition covers the first spacer region (12) and a second undoped spacer region (12) comprising the first material composition covers the undoped channel (11,14). The first material composition has a wider bandgap than the second material composition and the doping energy level (E.sub.D) is selected to provide electrons to the undoped channel (11,14) when the second material composition has a conduction band minimum less than the doping energy level (E.sub.D) and to provide holes to the first undoped channel (11,14) when the second material composition has a valence band maximum greater than the doping energy level (E.sub.D).
摘要:
A logic circuit including a pair of FETs connected in parallel and including first and second common current terminals, each of the FETs further having a control terminal connected to receive a logic signal thereon. A negative differential resistance device affixed to one of the first and second common current terminals and having a conductance characteristic such that the device operates at a peak current when one of the FETs is turned ON and at a valley current when both of the FETs are simultaneously turned ON. A load resistance coupled to the other of the first and second common current terminals and providing an output for the logic circuit.
摘要:
A field effect semiconductor device having multiple vertically stacked channels (12, 14, 16) separated by barrier layers comprising wide bandgap material (18) is provided. The channels (12, 14, 16) are formed on a wide bandgap buffer layer (11) and each channel is coupled a N-type drain region (22b). Each channel is also coupled to an N-type source region (25b). With appropriate gate bias on a gate electrode (17), quantized energy levels in the channels (12, 14, 16) are aligned to provide self-doping by electrons in the valence band of the P-channel (14) moving to the conduction band of the N-channels (12, 16) providing peak channel conductivity. At higher gate bias, one of the N-channels (12) becomes non-conductive creating a negative resistance region.
摘要:
A semiconductor device having a vertical interconnect or via stacked formed by quantum well comprising a semiconductor material is provided. A first semiconductor device (11) having a current carrying region (19) is formed in a first horizontal plane. A second semiconductor device (12) having a current carrying region (29) is formed in a second horizontal plane. Each of the current carrying regions have a first quantized energy level that is substantially equal. A semiconductor via (31) couples the current carrying region (19) of the first semiconductor device (11) to the current carrying region (29) of the second device (12), wherein the semiconductor via (31) has a first quantized energy level capable of alignment with the quantized energy levels of the current carrying regions (19, 29) of the first and second semiconductor devices (11,12).
摘要:
A heterojunction device including a first semiconductive layer on a substrate, a barrier layer on the first layer, a second semiconductive layer on the barrier layer and a multi-layer cap, on the second semiconductive layer. First and second gates positioned on layers of the cap to define first and second transistors, with the cap layers being selected and etched to pin the Fermi level in a first transistor conduction channel in the second semiconductive layer such that the number of carriers in the first conduction channel are substantially less than the number of carriers in surrounding portions of the second semiconductive layer and the Fermi level in a second transistor conduction channel in the first semiconductive layer such that the number of carriers in the second conduction channel are substantially less than the number of carriers in surrounding portions of the first semiconductive layer.
摘要:
A resonant tunneling diode having a quantum well sandwiched between first and second tunnel barrier layers and the quantum well and tunnel barrier layers sandwiched between an injection layer and a collector layer. The improvement includes a relatively thin layer of semiconductor material sandwiched between either the first tunnel barrier layer and the injection layer or the first tunnel barrier layer and the quantum well. The thin semiconductor layer has a valence band with an energy level lower than the valence band of the first tunnel barrier layer so as to prevent minority carriers from travelling toward the injection layer.
摘要:
A resonant tunneling FET including a heterostructure FET with a channel layer having a first current contact and a control contact operatively coupled thereto and a resonant tunneling device, including a quantum well layer sandwiched between barrier layers with a resonant tunneling layer affixed to an opposite side of one barrier layer, operably affixed to the heterostructure FET to form a second current contact. The resonant tunneling FET being constructed from a material system which allows the fabrication of additional devices on the same substrate.
摘要:
A band-to-band resonant tunneling transistor including GaSb and InAs resonant tunneling layers separated by a thin barrier layer and a second InAs layer separated from the GaSb layer by another thin barrier layer. A terminal on the InAs resonant tunneling layer and a terminal on the second InAs layer. Leakage current reduction layers are positioned on the second InAs layer with a bias terminal positioned thereon. The InAs resonant tunneling layer has a plurality of quantized states which are misaligned with the ground state of the GaSb layer in a quiescent state, each of the quantized states of the InAs resonant tunneling layer are movable into alignment with the ground state of the GaSb layer to provide current flow through the transistor with the application of a specific potential to the terminal on the second InAs layer.
摘要:
A heterojunction device including a first semiconductive layer on a substrate, a barrier layer on the first layer, a second semiconductive layer on the barrier layer and a multi-layer cap, on the second semiconductive layer. First and second gates positioned on layers of the cap to define first and second transistors, with the cap layers being selected and etched to pin the Fermi level in a first transistor conduction channel in the second semiconductive layer such that the number of carriers in the first conduction channel are substantially less than the number of carriers in surrounding portions of the second semiconductive layer and the Fermi level in a second transistor conduction channel in the first semiconductive layer such that the number of carriers in the second conduction channel are substantially less than the number of carriers in surrounding portions of the first semiconductive layer.