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. 01, 2002
Filed:
Dec. 18, 2000
Yvan Ziegler, Villiers, CH;
Diego Fischer, Neuchâtel, CH;
Eric Saurer, Bevaix, CH;
René Viennet, Neuchâtel, CH;
Asulab S.A., , CH;
Abstract
There is described a colored photovoltaic cell ( ) with a semiconductor, preferably silicon, which has high efficiency and a pleasing colored appearance, allowing it to be used as a dial for a watch or another electronic apparatus powered by the cell. The cell includes a reflective metal substrate ( ) serving as the bottom electrode, a stack of hydrogenated amorphous silicon layers forming p-i-n junctions ( ), and a transparent top electrode ( ). The latter may be coated with a layer ( ) of slightly diffusing lacquer, which may be colorless or colored. The respective thicknesses e of the top electrode and e of the silicon are combined as a function of the refractive indices of the materials so as to produce an interferential reflection in a predetermined reflection spectrum.