Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1990-06-28
1991-12-31
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
357 4, H01J 4014
Patent
active
050774662
ABSTRACT:
A quantum well electromagnetic wave detector disclosed having a semiconductor structure including a stacking of layers of material wherein the widths of the forbidden gaps of the materials are used to obtain a profile of potential energy corresponding to the bottom of the conduction band for the electrons in such a way that a first layer has a relatively low energy level with second and third layers having an intermediate energy higher than the energy of the first layer and fourth and fifth layers having high energy greater than either the intermediate or the low energy levels. The energy corresponding to a first permitted level is lower than the potential energy at the bottom of a conduction band of both of the materials used to make the second and third layers and the energy of the second level is between the potential energy at the bottom of a conduction band of both materials of the second and third layers and the potential energy of the bottom of the conduction band of the materials of the fourth and fifth layers. The first permitted level of energy of the quantum well is populated with electrons and an electric field is applied perpendicular to the plane of the structure.
REFERENCES:
patent: 4671830 (1987-06-01), Burnham
patent: 4806993 (1989-02-01), Voisin et al.
patent: 4903101 (1990-02-01), Maserjian
Applied Physics Letters, vol. 53, No. 20, Nov. 14, 1988, pp. 1961-1963, New York, U.S., S. R. Kurtz, et al., "High Photoconductive Gain in Lateral InAsSb Strained-Layer Superlattice Infrared Detectors".
Applied Physics Letters, vol. 50, No. 16, Apr. 20, 1987, pp. 1092-1094, New York, U.S., B. F. Levine, et al., "New 10 .mu.m Infrared Detector Using Intersubband Absorption in Resonant Tunneling GaAlAs Superlattices".
Delacourt Dominique
Papuchon Michel
Pocholle Jean-Paul
"Thomson-CSF"
Le Que T.
Nelms David C.
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