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:
Dec. 27, 1994
Filed:
May. 12, 1992
Bruce M Novak, El Sobrante, CA (US);
Edward H Haagen, Fairfax, CA (US);
Anand Viswanathan, Rancho Palo Verdes, CA (US);
Regents of the University of California, Oakland, CA (US);
Abstract
Photoactive cationic organic polymers are provided which are electrically insulating and which are capable of photolysis to an electrically conductive form. The organic polymer includes a C-A linkage, wherein C is a chalcogenide-sulfide, selenide or telluride-in the polymer backbone chain and A is in aryl or alkyl group. The C-A linkage is capable of being cleaved in the presence of ultraviolet light to release A as a free radical and cause the polymer to become electrically conducting in the presence of the light while the remainder of the polymer remains electrically non-conducting. A thin film of such a polymer containing an electrically insulating region and a photolysed electrically conductive region may be used as a semiconductor. Methods for forming photoactive arylated or alkylated poly(phenylene chalcogenide) polymers involving the step of direct arylation or alkylation of a poly(phenylene chalcogenide) polymer are also provided. In addition, a method is provided for forming a semiconductor. The method involves the steps of selectively exposing at least one region of a photoactive electrically insulating cationic organic polymer to photolytic light to release a radical and convert the exposed region to a stable electrically conducting state.