Abstract: A semiconductor device according to the present invention includes a substrate; a nitride semiconductor layer formed above the substrate and having a laminated structure including at least three layers; a heterojunction bipolar transistor formed in a region of the nitride semiconductor layer; and a field-effect transistor formed in a region of the nitride semiconductor layer, the region being different from the region in which the heterojunction bipolar transistor is formed.

Abstract: A semiconductor device according to the present invention includes a substrate; a nitride semiconductor layer formed above the substrate and having a laminated structure including at least three layers; a heterojunction bipolar transistor formed in a region of the nitride semiconductor layer; and a field-effect transistor formed in a region of the nitride semiconductor layer, the region being different from the region in which the heterojunction bipolar transistor is formed.

Abstract: Method for manufacturing a semiconductor device. A channel layer is formed by epitaxially growing a semiconductor layer, in which an ion species of a first conductivity is implanted on a semiconductor substrate. A source region, a drain region, and an emitter region which are of the first conductivity, are formed by activating, using annealing, a portion of the semiconductor substrate in which the ion species has been implanted. An emitter layer of the first conductivity, a base layer of a second conductivity having a band gap smaller than a band gap of the emitter layer, and a collector layer of the first conductivity or a non-doped collector layer are sequentially and epitaxially grown on the channel layer.

Abstract: A semiconductor device and manufacturing method satisfies both of the trade-off characteristic advantages of the HBT and the HFET. The semiconductor device is an HBT and HFET integrated circuit. The HBT includes a sub-collector layer, a GaAs collector layer, a GaAs base layer, and an InGaP emitter layer that are sequentially stacked. The sub-collector layer includes a GaAs external sub-collector region, and a GaAs internal sub-collector region disposed on the GaAs external sub-collector region. A mesa-shaped collector part and a collector electrode are separately formed on the GaAs external sub-collector region. The HFET includes a GaAs cap layer, a source electrode, and a drain electrode. The GaAs cap layer includes a portion of the GaAs external sub-collector region. The source electrode and the drain electrode are formed on the GaAs cap layer.

Abstract: The object of the present invention is to provide a semiconductor device and the manufacturing method thereof which are capable of preventing decrease in the collector breakdown voltage and reducing the collector resistance. The semiconductor device according to the present invention includes: a HBT formed on a first region of a semiconductor substrate; and an HFET formed on a second region of the semiconductor substrate, wherein the HBT includes: an emitter layer of a first conductivity; a base layer of a second conductivity that has a band gap smaller than that of the emitter layer; a collector layer of the first conductivity or a non-doped collector layer; and a sub-collector layer of the first conductivity which are formed sequentially on the first region, and the HFET includes an electron donor layer including a part of the emitter layer, and a channel layer formed under the electron donor layer.

Abstract: A field-effect transistor having a high-quality semiconductor/oxide interface and a method of fabricating the field-effect transistor are provided. The field-effect transistor includes a semiconductor substrate; a channel layer formed on the semiconductor substrate; a donor layer formed on the channel layer; a semiconductor layer formed in the donor layer and containing Pt; an oxide layer formed on the semiconductor layer and containing a perovskite-type oxide which functions as a gate insulating film; and a gate electrode formed on the oxide layer.

Abstract: A semiconductor device according to the present invention includes a substrate; a nitride semiconductor layer formed above the substrate and having a laminated structure including at least three layers; a heterojunction bipolar transistor formed in a region of the nitride semiconductor layer; and a field-effect transistor formed in a region of the nitride semiconductor layer, the region being different from the region in which the heterojunction bipolar transistor is formed.

Abstract: An object of the present invention is to provide a semiconductor resistive element having excellent linearity. A semiconductor device according to the present invention includes a HBT which is formed on a GaAs substrate and includes a group III-V compound semiconductor, and a semiconductor resistive element made of at least one layer included in a semiconductor epitaxial layer included in the HBT, and the semiconductor resistive element includes helium impurities.

Abstract: An HBT according to this invention includes: a sub-collector layer; a collector layer formed on the sub-collector layer and the base layer including a first collector layer, a second collector layer, a third collector layer, and a fourth collector layer. The first collector layer is formed on the sub-collector layer, and is made of semiconductor different from semiconductor of which the second to the fourth collector layers are made. The fourth collector layer is formed on the first collector layer, and has an impurity concentration lower than an impurity concentration of the second collector layer. The second collector layer is formed on the fourth collector layer, and has an impurity concentration lower than an impurity concentration of the sub-collector layer and higher than an impurity concentration of the third collector layer. The third collector layer is formed between the second collector layer and the base layer.

Abstract: The object of the present invention is to provide a heterojunction bipolar transistor with high breakdown tolerance which can be manufactured at a high reproducibility and a high yield, the heterojunction bipolar transistor includes: a sub-collector layer; a collector layer formed on the sub-collector layer; a base layer formed on the collector layer; and an emitter layer, which is formed on the base layer and is made of a semiconductor that has a larger bandgap than a semiconductor of the base layer, in which the collector layer includes: a first collector layer formed on the sub-collector layer; a second collector layer formed on the first collector layer; and a third collector layer formed between the second collector layer and the base layer, a semiconductor of the first collector layer differs from semiconductors of the third collector layer and the second collector layer, and an impurity concentration of the second collector layer is lower than an impurity concentration of the sub-collector layer and hi

Abstract: The present invention has as an objective to provide: a semiconductor device to satisfy both of the trade-off characteristic advantages of the HBT; and the HFET and a manufacturing method thereof. The semiconductor device in the present invention is an HBT and HFET integrated circuit. The HBT includes a sub-collector layer, a GaAs collector layer, a GaAs base layer, and an InGaP emitter layer which are sequentially stacked. The sub-collector layer includes a GaAs external sub-collector region, and a GaAs internal sub-collector region disposed on the GaAs external sub-collector region. A mesa-shaped collector part and a collector electrode are separately formed on the GaAs external sub-collector region. The HFET includes a GaAs cap layer, a source electrode, and a drain electrode, the GaAs cap layer including portion of the GaAs external sub-collector region, and the source electrode and the drain electrode being formed on the GaAs cap layer.

Abstract: A semiconductor device in which an E-FET and a D-FET are integrated on the same substrate, wherein an epitaxial layer includes, in the following order from the semiconductor substrate: a first threshold adjustment layer that adjusts a threshold voltage of a gate of the E-FET and a threshold voltage of a gate of the D-FET; a first etching-stopper layer that stops etching performed from an uppermost layer to a layer abutting on the first etching-stopper layer; a second threshold adjustment layer that adjusts the threshold voltage of the gate of the D-FET; and a second etching-stopper layer that stops the etching performed from the uppermost layer to a layer abutting on the second etching-stopper layer, and at least one of the first etching-stopper layer and the second threshold adjustment layer includes an n-type doped region.

Abstract: A semiconductor device according to the present invention includes: a semiconductor substrate; a channel layer formed on the semiconductor substrate; a donor layer formed on the channel layer; a first Schottky layer formed on the donor layer; a second Schottky layer formed on the first Schottky layer; a first gate electrode formed on the first Schottky layer to form a Schottky barrier junction with the first Schottky layer; a first source electrode and a first drain electrode formed so as to sandwich the first gate electrode and electrically connected to the channel layer; a second gate electrode formed on the second Schottky layer and made of a material different from the first gate electrode to form a Schottky barrier junction with the second Schottky layer; and a second source electrode and a second drain electrode formed so as to sandwich the second gate electrode and electrically connected to the channel layer.

Abstract: The object of the present invention is to provide a semiconductor device and the manufacturing method thereof which are capable of preventing decrease in the collector breakdown voltage and reducing the collector resistance. The semiconductor device according to the present invention includes: a HBT formed on a first region of a semiconductor substrate; and an HFET formed on a second region of the semiconductor substrate, wherein the HBT includes: an emitter layer of a first conductivity; a base layer of a second conductivity that has a band gap smaller than that of the emitter layer; a collector layer of the first conductivity or a non-doped collector layer; and a sub-collector layer of the first conductivity which are formed sequentially on the first region, and the HFET includes an electron donor layer including a part of the emitter layer, and a channel layer formed under the electron donor layer.

Abstract: The present invention has an object of providing a method for manufacturing a semiconductor device which can prevent occurrence of pattern abnormality of an electrode and deterioration of an electronic property. The method for manufacturing the semiconductor device including a GaAs substrate with a portion made of GaAs includes: forming a Ti/Pt/Au/Ti electrode on the GaAs substrate, the electrode including Pt and having a layered structure in which a top layer made of Ti; forming a collector electrode including AuGe on a portion made of GaAs; and performing heat treatment on the collector electrode in a state where both of the Ti/Pt/Au/Ti electrode and the collector electrode are exposed to a surface.

Abstract: Provided is a semiconductor device and a manufacturing method of the same which improve adhesion of a semiconductor substrate to a metal wire, the semiconductor substrate having a via hole formed from a bottom surface of the semiconductor substrate up to the metal wire on a top surface of the semiconductor substrate, and the metal wire being positioned on the top surface of the semiconductor substrate where there is an opening formed since the via hole is formed. The semiconductor device includes: a metal layer formed on a semiconductor substrate; an alloy reaction layer formed below the metal layer as a result of an alloy reaction between the semiconductor substrate and the metal layer; and a via hole formed from a bottom surface side of the semiconductor substrate up to the metal layer or up to the alloy reaction layer.

Abstract: A semiconductor device according to the present invention includes: a semiconductor substrate; a channel layer formed on the semiconductor substrate; a donor layer formed on the channel layer; a first Schottky layer formed on the donor layer; a second Schottky layer formed on the first Schottky layer; a first gate electrode formed on the first Schottky layer to form a Schottky barrier junction with the first Schottky layer; a first source electrode and a first drain electrode formed so as to sandwich the first gate electrode and electrically connected to the channel layer; a second gate electrode formed on the second Schottky layer and made of a material different from the first gate electrode to form a Schottky barrier junction with the second Schottky layer; and a second source electrode and a second drain electrode formed so as to sandwich the second gate electrode and electrically connected to the channel layer.

Abstract: The present invention aims at providing a heterojunction bipolar transistor having improved breakdown voltage on operation for high power output, and includes: a GaAs semiconductor substrate 100; an n+-type GaAs sub-collector layer 110; an n-type GaAs collector layer 120; a p-type GaAs base layer 130; an emitter layer 140; an n-type GaAs emitter cap layer 150; and an n-type InGaAs emitter contact layer 160. The emitter layer 140 has a multilayer structure including an n-type or non-doped first emitter layer 141 and an n-type second emitter layer 142 which are laminated in sequence. The first emitter layer 141 is made of a semiconductor material including Al, while the second emitter layer 142 is made of InxGa1-xP (0<x<1).

Abstract: It is the object of the present invention to provide a manufacturing method for a compound semiconductor device capable of removing remaining organic substances without deteriorating a characteristic of the compound semiconductor device, wherein a surface of an i-type AlGaAs schottky layer is cleaned in a state where light is blocked using either one of ozonized (O3) water whose ozone concentration is at most 13 mg/L and hydrogenated (H2) water whose hydrogen ion concentration (pH) is from 6 to 8 inclusive, or using both of the ozonized water and the hydrogenated water after a schottky electrode made of Ti/Al/Ti is evaporated onto the exposed i-type AlGaAs schottky layer and a lift-off operation is performed using a remover.

Abstract: The object of the present invention is to provide a heterojunction bipolar transistor with high breakdown tolerance which can be manufactured at a high reproducibility and a high yield, the heterojunction bipolar transistor includes: a sub-collector layer; a collector layer formed on the sub-collector layer; a base layer formed on the collector layer; and an emitter layer, which is formed on the base layer and is made of a semiconductor that has a larger bandgap than a semiconductor of the base layer, in which the collector layer includes: a first collector layer formed on the sub-collector layer; a second collector layer formed on the first collector layer; and a third collector layer formed between the second collector layer and the base layer, a semiconductor of the first collector layer differs from semiconductors of the third collector layer and the second collector layer, and an impurity concentration of the second collector layer is lower than an impurity concentration of the sub-collector layer and hi