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:
Apr. 23, 1991
Filed:
Feb. 28, 1990
Applicant:
Inventor:
Tetsuo Shiba, Itami, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
357 30 ; 357 16 ; 357 58 ; 437126 ; 437 22 ; 437154 ; 437904 ;
Abstract
A semiconductor light detector for detecting multiple wavelengths of light includes a semiconductor substrate, a plurality of first conductivity type semiconductor layers successively disposed on the semiconductor substrate with increasing energy band gap from the substrate towards a light incident surface of the detector, a first second conductivity type semiconductor region extending from the light incident surface and reaching the first conductivity type layer closest to the surface, and one or more additional second semiconductor regions successively surrounding the first second semiconductor region, reaching the surface and respective first conductivity type semiconductor layers.