Patent ID: 8816192
Filing Date: 2014-08-26
Classification: H01L,Y02E,Y02P

Abstract:
1. A thin film solar cell characterized by improved efficiency of electricity generation from solar photons comprising: a. a carrier layer comprising a polymer, wherein a surface of said carrier layer comprises periodically repeating indents and protrusions, each said indent having a depth of 5 nm and a width of less than approximately 100 nm; b. a metal back contact layer deposited on the periodically repeating indents and protrusions on said carrier layer surface, wherein a surface of said metal contact back layer in contact with said carrier layer surface comprises periodically repeating indents and protrusions located and sized to correspond to said periodically repeating indents and protrusions on said carrier surface layer, said periodically repeating indents and protrusions being configured to reduce work function; c. a p-type semiconductor absorber layer comprising Copper Indium Gallium Diselenide disposed on a surface of said metal back contact layer opposite said metal back contact layer surface with indents, wherein said p-type semiconductor absorber layer includes a band gap; d. an n-type semiconductor collector layer disposed on a surface of said p-type semiconductor absorber layer not in contact with said metal back contact layer to form a p-n junction with a voltage differential; e. a window layer comprising zinc oxide (ZnO) disposed on a surface of said n-type semiconductor collector layer opposite said p-n junction; and f. an electrical contact comprising an aluminum grid positioned on a surface of aid window layer to receive electrons from said n-type semiconductor collector layer.