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:
Apr. 11, 1995
Filed:
Oct. 22, 1993
Ronald Dekker, Eindhoven, NL;
Henricus G Maas, Eindhoven, NL;
Armand Pruijmboom, Eindhoven, NL;
Wilhelmus T Van Den Einden, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A method of manufacturing a semiconductor device with a semiconductor element which includes a semiconductor zone (19) situated below an electrode (18) and adjoining a surface (5) of a semiconductor body (1), which semiconductor zone substantially does not project outside the electrode (18) in lateral direction. The electrode (18) is here formed on the surface (5) of the semiconductor body (1), after which semiconductor material adjoining the surface (5) and not covered by the electrode (18) is removed by an etching treatment, whereby the position of the semiconductor zone (19) below the electrode (18) is defined. Before the electrode (18) is formed, a surface zone (16) adjoining the surface (5) is formed in the semiconductor body (1) with a depth and a doping such as are desired for the semiconductor zone (19) to be formed below the electrode (18), after which the electrode (18) is formed on this surface zone and, during the etching treatment, the portion of the surface zone (16) not covered by the electrode (18) is etched away through its entire thickness. Conducting materials such as aluminium or aluminium alloys may be used for the electrode (18), i.e. materials which are not resistant to temperatures necessary for forming semiconductor zones through diffusion.