Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1996-04-18
1999-04-06
Le, Que
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250332, 257184, G01J 350
Patent
active
058922229
ABSTRACT:
A low light level detection and imaging device including a photon sensing and counting device for image detection that is capable of detecting/imaging low photon flux levels over a wide spectral range using either image tube or solid state readout. The sensing and counting is composed of a detector stack having several photoconductive layers, at least one layer of the stack being an amorphous Selenium layer that is capable of high gain avalanche multiplication. The stack further includes an amorphous Silicon layer deposited on the amorphous Selenium layer to absorb infrared and ultraviolet radiation to enhance responsivity in the red and near-IR region, whereas the purpose of the amorphous Selenium layer is to provide high responsivity in the blue region and also to provide avalanche gain or multiplication of the photo generated carriers in both the amorphous Silicon or Selenium layers. Hence, the Selenium avalanching layer 12 provides low noise amplification for carriers injected from the Silicon layer into the Selenium layer.
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Le Que
Loral Fairchild Corporation
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