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. 21, 1997
Filed:
May. 26, 1995
Hirotaka Kizuki, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A semiconductor device includes a semi-insulating semiconductor substrate, a semiconductor layer structure including at least an undoped layer of a first semiconductor, an undoped spacer layer of a second semiconductor having an electron affinity smaller than that of the first semiconductor, and an n type electron supply layer of the second semiconductor successively laminated on the substrate, the undoped layer having a flat top surface and a flat rear surface on the flat top surface of the undoped spacer layer, having, at a top surface, a concavo-convex periodic structure, and a flat rear surface, the n-type electron supply layer of the second semiconductor having a flat top surface and a rear surface that buries concavities of the concavo-convex structure of the undoped spacer layer, and a plurality of periodically arranged Schottky electrodes on the flat top surface of the n type electron supply layer, arranged in a direction perpendicular to the concavo-convex periodic structure of the undoped spacer layer.