Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1988-01-29
1989-06-13
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
313542, H01J 4014
Patent
active
048395110
ABSTRACT:
A photoconductive member is provided with increased sensitivity to radiation incident thereupon and with increased photo-yield in response thereto by means of a multi-layered, sandwich-type construction based upon the provision of successive layers of sensitizing material over corresponding successive layers of conducting material. The photoconductive member comprises at least two composite layers formed one above the other on an insulating substrate, each composite layer comprising a first layer of material capable of conducting charge and a second layer of material comprising polar molecules disposed upon the charge-conducting material layer in such a manner that successive layers of polar molecules are adsorbed and retained in an oriented fashion on successive layers of the charge-conducting material. In combination, the alternating layers of charge-conducting material and polar molecules increase photo-yield in response to a given quantum of incident radiation and also increase the range of wavelength of incident radiation to which the photoconductive member is responsive. The sandwich-type construction permits photoconductor sensitivity to be increased as a function of the number of layers of conducting material and polar molecules used to form the photoconductive surface. The multi-layered construction also exhibits reduced sensitivity to the degrading effects of impurities, is adapted to convenient fabrication, and exhibits extended lifetime.
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Even Uzi J.
Kim Chi-woo
Thompson James C.
Board of Regents, The U. of Texas System
Irfan Kareem M.
Nelms David C.
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