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:
Nov. 15, 1988
Filed:
Mar. 13, 1986
Kiyokazu Nakagawa, Amsterdam-Oost, NL;
Akitoshi Ishizaka, Kokubunji, JP;
Yasuhiro Shiraki, Hino, JP;
Yoshimasa Murayama, Koganei, JP;
Abstract
A semiconductor device includes a multilayer semiconductor structure comprising alternately p- (or n-) type heavily doped semiconductor layers and n- (or p-) type lightly doped semiconductor layers. Holes (or electrons) are confined within a narrow layer in a fashion like a two-dimensional gas, whereby high mobility is realized notwithstanding of high carrier concentration. Electrical conductivity of the multilayer semiconductor structure can be made higher than that of a bulk semiconductor. Very high conductivity can be realized by forming each layer in a thickness within a range of 10 .ANG. to 1000 .ANG. and preferably 50 .ANG. to 500 .ANG.. Ratio in impurity concentration of the heavily doped layer to the low doped layer is not smaller than one order of magnitude.