Batteries: thermoelectric and photoelectric – Photoelectric – Cells
Reexamination Certificate
2009-03-09
2011-12-27
Neckel, Alexa (Department: 1723)
Batteries: thermoelectric and photoelectric
Photoelectric
Cells
C136S260000, C136S264000
Reexamination Certificate
active
08084682
ABSTRACT:
A heterojunction photovoltaic device for the production of electrical energy in response to the incident light includes an optically transparent substrate, a front contact formed of an transparent conductive oxide for collecting light generated charge carriers, an n-type window layer formed of cadmium sulfide or zinc sulfide, a p-type absorber structure disposed on the window layer, thereby forming a rectification junction therebetween, and a back contact comprising at least one metal layer. The p-type absorber structure has a plurality of p-type absorber layers in contiguous contact. Each absorber layer contains cadmium as a principal constituent and has a different composition and a different band gap energy. The first absorber layer is in contiguous contact with the n-type window layer. The band gap energy progressively decreases from the first absorber layer to the last absorber layer in the p-type absorber structure.
REFERENCES:
patent: 4753684 (1988-06-01), Ondris et al.
patent: 5393675 (1995-02-01), Compaan
patent: 2009/0235986 (2009-09-01), Hotz et al.
Gardner Shannon
Knight G. Marlin
Neckel Alexa
Yen Bing K.
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