Abstract:
PROBLEM TO BE SOLVED: To provide a photodiode array with high time resolution.SOLUTION: A photodiode array comprises: a light-receiving region which includes a plurality of light detection parts 10 each including a first conductivity type first semiconductor region 12, second conductivity type second semiconductor regions 13, 14 which form pn junction with the first semiconductor region 12; a first contact electrode 3A making contact with the second semiconductor region; a second contact electrode 4A which is composed of a material different from that of the first contact electrode 3A and arranged at a position overlapping the first contact electrode 3A and in contact with the first contact electrode; and a resistive layer 4B arranged successively to the second contact electrode 4A.
Abstract:
PROBLEM TO BE SOLVED: To provide an infrared detector capable of more easily switching 1 wavelength detection or 2 wavelength detection.SOLUTION: An infrared detector comprises: a semiconductor substrate 1; a lower contact layer 3 formed on the semiconductor substrate 1; a light absorption layer 4 formed on the lower contact layer 3; an upper contact layer 5 formed on the light absorption layer 4; and a voltage source 8 which applies voltage between the lower contact layer 3 and the upper contact layer 5. The light absorption layer 4 includes at least one portion in which a quantum well layer 42, a coupling layer 43, and a quantum dot layer 44 are laminated in this order. Whether the quantum well layer 42 and the quantum dot layer 44 form coupling mode is determined according to a size of the voltage applied by the voltage source 8.
Abstract:
PROBLEM TO BE SOLVED: To obtain an avalanche photodiode in which high-speed responsibility can be improved and changes over time in characteristics can be reduced.SOLUTION: An AlInAs avalanche multiplication layer 3, a p-type AlInAs field control layer 4, an undoped light absorption layer 5, and a window layer 6 are layered in order on an n-type InP substrate 1. A p-type region 7 is formed partially in the window layer 6 and the undoped light absorption layer 5. Carbon is used as a dopant of the p-type AlInAs field control layer 4. Zn is used as a dopant of the p-type region 7. A bottom face of the p-type region 7 exists below an interface between the undoped light absorption layer 5 and the window layer 6.
Abstract:
PROBLEM TO BE SOLVED: To provide various embodiments of photovoltaic cells utilizing mesh electrodes on at least one exposure side of the photovoltaic cells.SOLUTION: A photovoltaic cell comprises: a photosensitized nanomatrix layer and a charge carrier medium which are disposed between two electrodes. At least one exposure side electrode is made of an opaque material in a form of a mesh. The photovoltaic cell also includes a catalytic medium disposed adjacently to at least one of the electrodes to facilitate charge transfer and/or current flow between the electrode and the charge carrier medium.