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:
Mar. 05, 1991
Filed:
Jan. 18, 1990
Applicant:
Inventors:
Robert K Surridge, Kanata, CA;
Jingming Xu, Etobicoke, CA;
Assignee:
Northern Telecom Limited, Montreal, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ;
U.S. Cl.
CPC ...
357 30 ; 357-4 ; 357 16 ; 357 22 ;
Abstract
A Metal-Semiconductor-Metal (MSM) photodetector comprises a semiconductor substrate, a semiconductor barrier layer on the substrate, a thin semiconductor active layer on the barrier layer, and at least two electrical contacts to the active layer. The barrier layer prevents carriers generated deep in the substrate from reaching the contacts. As it is the delayed detection of these carriers which limits the useful operating speed or bandwidth of conventional MSM photodetectors, the MSM photodetector according to the invention is capable of higher speed operation than conventional MSM photodetectors.