Asymmetric contacted metal-semiconductor-metal photodetectors
First Claim
1. A photodetector comprising:
- a semiconductor substrate having an active region on one surface thereof,a first set of electrodes deposited on the active region of the substrate made from a first material,a second set of electrodes deposited on the active region of the substrate made of a second material, wherein the first set and second set of electrodes are made of different metals having different Schottky barrier heights.
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Accused Products
Abstract
A metal-semiconductor-metal (MSM) photodetector, specifically a new, improved low noise device is disclosed. The disclosed device is a MSM photodiode in which the cathode and anode are made of different materials with optimal Schottky barrier heights. One of these materials is chosen to provide a high ratio of Schottky barrier height to hole transport and the other to provide a high ratio of Schottky barrier height to electron transport. The disclosed MSM photodetector is designed to allow each Schottky barrier to be individually optimized to the point that a wide bandgap Schottky barrier enhancement layer and its associated heterointerface may become unnecessary. Elimination of the charge buildup at the heterointerface enhances carrier extraction resulting in photodetectors with elevated quantum efficiency and enhanced bandwidths.
44 Citations
35 Claims
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1. A photodetector comprising:
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a semiconductor substrate having an active region on one surface thereof, a first set of electrodes deposited on the active region of the substrate made from a first material, a second set of electrodes deposited on the active region of the substrate made of a second material, wherein the first set and second set of electrodes are made of different metals having different Schottky barrier heights. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification