摘要:
A semiconductor photodetector device includes: a first semiconductor layer of a first conductivity type; and a second semiconductor layer of a second conductivity type formed on the first semiconductor layer and having a light-receiving region. The first semiconductor layer includes a first region containing an impurity of the first conductivity type at a high concentration and a second region formed on the first region and containing an impurity of the first conductivity type at a concentration lower than that of the first region. The second semiconductor layer includes a third region containing an impurity of the second conductivity type at a concentration higher than that of the second region and a fourth region formed on the third region and containing an impurity of the second conductivity type at a concentration higher than that of the third region.
摘要:
A semiconductor photodetector device includes: a first semiconductor layer of a first conductivity type; and a second semiconductor layer of a second conductivity type formed on the first semiconductor layer and having a light-receiving region. The first semiconductor layer includes a first region containing an impurity of the first conductivity type at a high concentration and a second region formed on the first region and containing an impurity of the first conductivity type at a concentration lower than that of the first region. The second semiconductor layer includes a third region containing an impurity of the second conductivity type at a concentration higher than that of the second region and a fourth region formed on the third region and containing an impurity of the second conductivity type at a concentration higher than that of the third region.
摘要:
An optical semiconductor device includes a phototransistor for receiving incident light. The phototransistor includes a collector layer of a first conductivity type formed on a semiconductor substrate, a base layer of a second conductivity type formed on the collector layer, and an emitter layer of a first conductivity type formed on the base layer. A thickness of the emitter layer is equal to or less than an absorption length of the incident light in the semiconductor substrate.
摘要:
An optical semiconductor device includes a phototransistor for receiving incident light. The phototransistor includes a collector layer of a first conductivity type formed on a semiconductor substrate, a base layer of a second conductivity type formed on the collector layer, and an emitter layer of a first conductivity type formed on the base layer. A thickness of the emitter layer is equal to or less than an absorption length of the incident light in the semiconductor substrate.
摘要:
A transistor that forms an integrated circuit, a photo detector and a micromirror are mounted on the same semiconductor substrate in an optical semiconductor device of the present invention, which has an antireflection film that is formed on the photo detector, a first insulating film which is formed on the antireflection film and in which an opening is created in the state where the antireflection film is exposed, and an etching stopping film which is formed on the first insulating film and which has been left in the periphery around the opening in the first insulating film on the antireflection film and in the periphery around the portion above the micromirror.
摘要:
A transistor that forms an integrated circuit, a photo detector and a micromirror are mounted on the same semiconductor substrate in an optical semiconductor device of the present invention, which has an antireflection film that is formed on the photo detector, a first insulating film which is formed on the antireflection film and in which an opening is created in the state where the antireflection film is exposed, and an etching stopping film which is formed on the first insulating film and which has been left in the periphery around the opening in the first insulating film on the antireflection film and in the periphery around the portion above the micromirror.
摘要:
A narrow band high sensitivity photo-detector for inverse photoemission spectroscopy, in which an electron beam from an electron gun is applied onto a sample and a light reflected therefrom is converged into a photo-electron detector, so as to effect photo-electron detection in a photo-electron multiplier, wherein said photo-electron detector comprises a CaF.sub.2 monocrystal window provided with a KCl thin film in the front of said photo-electron detector, a first dynode deposited with a KCl thin film on a surface thereof, wherein an output of the photo-electron multiplier is applied with a pulse counter circuit through an amplifier, so as to measure light absorption properties, window transmissibility and detection sensitivity as a band pass filter.
摘要:
A bandpass photon detector for inverse photoemission spectroscopy comprises a sample chamber and an analyzer chamber connected to a vacuum exhaust system, respectively; a photon detector connected to the analyzer chamber; the sample chamber and the analyzer chamber are switchably connected through a gate valve and provided with a sample transfer system for transferring a sample held at a center axial line of the sample chamber to a center portion of the analyzer chamber, the analyzer chamber is provided with an electron gun opposed to a sample positioned at a center where the sample is transferred and a photomultiplier comprising a low cut filter consisting of Cu-BeO at the opposite side of the electron gun, wherein a potassium chloride is deposited in a thickness of 500-1000 .ANG. on a first diode of said photomultiplier, thereby high inverse photoemission spectroscopy can be measured so as to analysis and estimation of semiconductors and magnetic material.
摘要:
An operational amplifier including a pair of differential input transistors is provided with a feedback resistor switching circuit and a variable current source. When a loaded optical disk is a DVD-ROM, the feedback resistor switching circuit reduces a gain of the operational amplifier and the variable current source selects a large current (of, for example, 1 mA) as a common bias current supplied to the differential input transistors. When the loaded optical disk is a DVD-RAM with low reflectance and low recording/reproducing speed, the feedback resistor switching circuit enhances the gain of the operational amplifier and the variable current source selects a small current (of, for example, 0.5 mA) as the common bias current.
摘要:
A photo detector IC (PDIC) is connected with a flexible printed circuit board (FPC). A signal converted into a voltage through light-to-voltage conversion in the PDIC is connected with the drain of a field effect transistor (FET), while the source of the FET is connected to an output terminal. A signal from the output terminal is input into a signal processing board of the main body via the FPC serving as an equivalent circuit composed of a coil and a capacitor. The gate of the FET is connected with a variable voltage source. Peaking occurs due to inductor components and capacitance components of the FPC. However, by application of voltage to the variable voltage source, the gate voltage value of the FET is adjusted to be an optimal value, whereby the peaking is suppressed by the on-resistance of the FET.