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:
Oct. 20, 1987
Filed:
Aug. 25, 1986
Takao Kaneda, Kawasaki, JP;
Kazuo Nakajima, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A semiconductor device for receiving light includes a first semiconductor layer having a first conductivity type; the device further includes a second semiconductor layer having the first conductivity type, contacting the first semiconductor layer, having a forbidden bandwidth larger than that of the first semiconductor layer and distributed so that the forbidden bandwidth has a maximum value at an intermediate position in the vertical direction and of the second semiconductor layer. The semiconductor device further includes a third semiconductor region having a second conductivity type opposite the first conductivity type, contacting the second semiconductor layer and having a forbidden bandwidth smaller than that of the third contact end portion between the semiconductor region and the second semiconductor layer and larger than that of the first semiconductor layer. The third semiconductor region having the second conductivity type acts as a window layer through which incident light is transmitted.