Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2008-07-14
2009-12-15
Le, Que T (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S2140RC
Reexamination Certificate
active
07633042
ABSTRACT:
The present invention is a pixel sensor cell and method of making the same. The pixel sensor cell approximately doubles the available signal for a given quanta of light. The device of the present invention utilizes the holes produced by impinging photons in a pixel sensor cell circuit. A pixel sensor cell having reduced complexity includes an n-type collection well region formed beneath a surface of a substrate for collecting electrons generated by electromagnetic radiation impinging on the pixel sensor cell and a p-type collection well region formed beneath the surface of the substrate for collecting holes generated by the impinging photons. A circuit structure having a first input is coupled to the n-type collection well region and a second input is coupled to the p-type collection well region, wherein an output signal of the pixel sensor cell is the magnitude of the difference of a signal of the first input and a signal of the second input.
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Notice of Allowance: U.S. Appl. No. 12/172,304, Title: “Method of Forming a Pixel Sensor Cell for Collecting Electrons and Holes”, filed Jul. 14, 2008, dated mailed: Mar. 17, 2009.
Adkisson James W.
Bryant Andres
Ellis-Monaghan John J.
Jaffe Mark D.
Johnson Jeffrey B.
Canale Anthony J.
International Business Machines - Corporation
Le Que T
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