Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1993-02-26
1994-10-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
25037014, 257458, H01J 4014
Patent
active
053591860
ABSTRACT:
A particle detector for detecting ionizing particles incident on the detector which form electron-hole pairs upon penetrating the detector, the detector comprising a substrate, a first electrode formed on the substrate, a body portion supported by the first electrode, a second electrode formed over the body portion, and a voltage source for applying a forward bias voltage across the first and the second electrodes. The body portion includes two monolithic, contiguous amorphous silicon regions. A first region is doped to be of a first conductivity type, and a second region is an intrinsic region. The applied forward bias voltage must be greater than the flat band voltage of the detector and sufficient to bias the detector into the space charge limited regime so that charge carriers, injected at the first electrode, are blocked by a potential barrier formed near the interface between the first and the second regions. When an ionizing particle penetrates the detector, the hole (or electron) formed thereby moves towards and modulates the potential barrier to allow previously blocked charge carriers to pass over the barrier, to move across the detector and to be collected by the second electrode to provide an enhanced signal in response to the ionizing particle. The ratio of carriers, so produced, to ionizing particles (i.e. the gain) can exceed 1000.
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Fonash Stephen J.
Hou Jing-ya
Rubinelli Francisco A.
Hamrick Claude A. S.
Le Que T.
Nelms David C.
Pennsylvania State University
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