Abstract:
PROBLEM TO BE SOLVED: To provide a semiconductor device excellent in performance and reliability by making clear the relationship between an AlN buffer layer and the performance and reliability of a GaN-based FET, its manufacturing method, and a substrate for manufacturing the semiconductor device. SOLUTION: The semiconductor device is provided with the substrate (10), the buffer layer (12) formed on the substrate (10) and composed of aluminum nitride having a film thickness of 5-40 nm, an operation layer (20) formed on the buffer layer (12) and composed of a gallium nitride-based semiconductor, and a control electrode (26) provided on the operation layer (20). Its manufacturing method, and the substrate for manufacturing the semiconductor device are provided. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for realizing a small distance between an active layer and a current block layer with excellent controllability in a buried type semiconductor laser. SOLUTION: The semiconductor laser includes: a first clad layer made of a compound semiconductor containing an impurity of a first conduction type and provided with a projection of a mesa shape; an active layer formed in a stripe shape on the projection and provided with a side surface inclined in an angle 70 degrees or more and 90 degrees or less to an upper surface of the first clad layer; buried layers formed at both sides of the projection and containing an impurity of a second conduction type; a current block layer containing an impurity of the first conduction type formed on the buried layer and provided with a first surface whose one end contacts with a virtual plane formed by extending side surfaces of the active layer and which is inclined, downward from the contacting end, in an angle of approximately 55 degrees to the upper surface of the first clad layer, and also provided with a second surface which is inclined in an angle larger than that of the side surface of the active layer and smaller than that formed by the upper surface of the first clad layer and a surface perpendicular thereto; and a second clad layer containing an impurity of the second conduction type formed on the current block layer and the active layer. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a highly reliable semiconductor device with high withstand pressure, a manufacturing method of the device, a capacitor, a manufacturing method of the element, a MIS-type semiconductor device and a manufacturing method of the device. SOLUTION: In the semiconductor device, the capacitor, and the MIS-type semiconductor device; a silicon nitride film 23 formed on the condition that a flow rate with respect to a total flow rate of hydrogen gas is 0.2% to 5% is used for a capacitor film, a passivation film, a gate insulating film or a mask film by using a plasma CVD device and mixed gas formed of mono silane gas, hydrogen gas and nitrogen gas. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To solve the problem wherein connection loss between a flat antenna and a transmission line arranged in the thickness direction of a substrate is large. SOLUTION: The antenna substrate comprises a substrate (10), an antenna portion, and a pseudo coaxial line. The antenna portion is arranged at one plane of the substrate (10), and comprises a first conductor (1) and a second conductor (2), which is arranged separately from and around the first conductor (1) and used as a ground potential. The pseudo coaxial line is arranged in the thickness direction of the substrate (10), and comprises a center conductor (3) connected to the first conductor (1), and a plurality of earth conductors (4) connected to the second conductor (2) and arranged separately from and intermittently around the center conductor (3). COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a highly reliable semiconductor device for enabling high output operation by reducing a collapse phenomenon without the separation of an insulating layer from a semiconductor layer. SOLUTION: The semiconductor device comprises a GaN system semiconductor layer 11 formed on a substrate 10, and a silicon nitride film layer formed on the GaN system semiconductor layer to have a silicon/nitrogen composition ratio of 0.8 to 2.5 or an aluminum nitride film layer 20 having an aluminum/silicon composition ratio of 1.0 to 2.5. The manufacturing method of the semiconductor device can improve close contact between the insulating layer and the semiconductor layer by selecting a composition of the silicon nitride layer formed on the semiconductor layer, prevent the separation of the insulating film layer from the surface of semiconductor layer, and reduce the collapse phenomenon. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a semiconductor device that is easy in manufacturing and inexpensive, a decoder, and a method of manufacturing the same. SOLUTION: A semiconductor device has a plurality of switches (SP3T10, 13, and SPPT11, 12) each of which has an input pad 16 and an output pad 17 separately, wherein at least part of the plurality of input pads 16 or output pads 17 are configured to be electrically connected to one another externally. At least part of the plurality of input pads 16 or output pads 17 are electrically connected to one another externally in this way, thereby giving a switch configuration according to the specification of apparatus in which the semiconductor device is mounted. Accordingly, the device is easy in manufacturing and inexpensive. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a wavelength selection mirror unit that can be miniaturized without making the structure complex. SOLUTION: The wavelength selection mirror unit 100 comprises a first etalon 10 in which a refractive index to incident light is variable, and a mirror 20 for reflecting incident light through the first etalon. The first etalon 10 is fixed to the mirror 20. In the wavelength selection mirror unit 100, the peak wavelength of incident light can be changed without changing the inclination of the first etalon 10, thus dispensing with space for changing the inclination of the first etalon 10 and hence simplifying the structure of the wavelength selection mirror unit 100. Also, the wavelength selection mirror unit 100 can be miniaturized. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a semiconductor device capable of reducing power consumption. SOLUTION: The semiconductor device 100 includes a decoder 103 that is connected between a power terminal 5 to which a supply voltage is supplied and a ground terminal 6, and decodes a signal inputted from input terminals 41-43; and a power supply control circuit 109 for disconnecting the power terminal 5 from the decoder 103. The power supply control circuit 109 is connected between the input terminals 41-43 and the decoder 103 in parallel by wire-bonding. The power supply control circuit 109 includes logic 93 for generating a control signal for controlling a drain switch FET 91 by using the combination of signals not used in decoding in the combinations of signals inputted from the input terminals 41-43. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a low cost optical module wherein an LD and a surface incident photoreceptor for monitoring the optical output from the LD are mounted on the same substrate. SOLUTION: Wiring 14a-c, 15 for driving the LD 11 and the photoreceptor 12 are formed on the main surface of the platform substrate 13. The rear face of the LD 11 is fixed to the predetermined location of the platform substrate 13, and the photoreceptor 12 is disposed in the rear of the end surface of the LD 11 with the photoreception surface thereof facing upward to be able to monitor the laser beam emitted from the end surface of the LD 11. A reflective part 16 for reflecting the laser beam emitted from the end of the LD 11 to the photoreceptor is provided above the photoreceptor 12. The LD 11 and the photoreceptor 12 are connected to corresponding driving wiring 14a, 15 with bonding wires 17, 18 to form the optical module. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a method for manufacturing GaN based semiconductor devices for high precision processes, by improving the adhesion of mask for dry etching to the surface of etching material. SOLUTION: A Ti film 22 and an Ni film 24 are laminated, in this order, on a GaN-based semiconductor layer of etching material and a substrate 21 of SiC or sapphire, for film formation by vacuum deposition. The laminated film is patterned by photolithographic method to form a mask. If the etching base body is, for example, the SiC substrate, the thermal expansion coefficient of SiC is 4.2×10 -6 /°C and that of Ni is 12.8×10 -6 /°C. By providing the Ti film 22, whose thermal expansion coefficient is 9.0×10 -6 /°C, the distortion generated by thermal expansion due to the rise of the temperature during etching is reduced to improve adhesion of the mask to the SiC substrate surface, resulting in suppressing of the occurrence of peeling or cracking. COPYRIGHT: (C)2006,JPO&NCIPI