The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 15, 1989
Filed:
Jan. 26, 1988
Arthur M Hoeberechts, Eindhoven, NL;
U.S. Philips Corp., New York, NY (US);
Abstract
A radiation-sensitive semiconductor device has a high-ohmic semiconductor wafer with a thicker edge portion and a thinner central portion, in which a photodiode is located. The surface opposite to the photodiode is provided with a highly-doped contact layer, on which a metal layer is provided. The central portion is so thin that at a low photodiode voltage the depletion zone of the photodiode extends as far as the contact layer. According to the invention, the device includes an active screening diode, which extends both in the edge portion and in the central portion and whose depletion zone extends in the operating condition in the central portion as far as the contact layer. As a result, diffusion of charge carriers from the edge portion to the photodiode is avoided.