1979-08-06
1981-02-10
Edlow, Martin H.
357 13, 357 30, H01L 2916
Patent
active
042505160
ABSTRACT:
A low noise multistage photodetector device is formed from a sequence of pairs of layers of opposite conductivity type having heterojunctions between each pair. The second layer of each pair has a bandgap which is larger than the bandgap of the first layer of the pair adjacent to the second layer. Electrodes are formed on the device so that voltages may be applied to reverse bias the heterojunctions formed between each pair in the sequence and to forward bias the heterojunctions formed between the second layer of one pair and the first layer of another pair. The device provides traps for one sign of carrier, which traps prevent the trapped carrier from avalanching through amplification regions of the device.
REFERENCES:
patent: 3982261 (1976-09-01), Antypas
patent: 4103312 (1978-07-01), Chang
patent: 4127862 (1978-11-01), Ilegems
patent: 4163237 (1979-07-01), Dingle
patent: 4179702 (1979-12-01), Lamorte
McIntyre, IEEE Trans. on Electron Devices, vol. ed. 13, No. 1, Jan. 1966.
Bell Telephone Laboratories Incorporated
Edlow Martin H.
Einschlag Michael B.
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