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. 02, 1990
Filed:
Jul. 03, 1989
Joseph P Rosbeck, Santa Barbara, CA (US);
Charles A Cockrum, Goleta, CA (US);
Santa Barbara Research Center, Goleta, CA (US);
Abstract
An array of photovoltaic radiation detectors and a method of fabricating same. The array 10 includes a substrate 12 substantially transparent to radiation having wavelengths of interest and a radiation absorbing base layer 14 having a first surface 14a overlying a surface of the substrate for admitting incident radiation into the base layer. The base layer is comprised of a compositionally graded p-type Hg.sub.1-x Cd.sub.x Te material wherein x equals approximately 0.6 to approximately 0.8 at the first surface and equals less than approximately 0.4 at a second surface 14b. A cap layer 16 overlies the second surface of the radiation absorbing base layer, the cap layer also being compositionally graded. The cap layer has a bandgap that increases in width as a function of distance from the second surface of the base layer. The array further includes a plurality of regions 18 formed through the top surface of and substantially wholly within the wide bandgap cap layer, each of the regions forming a p-n junction 18a with the underlying material of the cap layer for collecting charge carriers. A plurality of channels 22 prevent lateral diffusion of charge carriers through the base layer.