Patent ID: 8859887

Claim:
A photovoltaic device comprising a photovoltaic layer and a back-side transparent electrode layer, the photovoltaic layer having a p-layer, an i-layer and an n-layer stacked on top of a substrate, wherein the n-layer comprises a nitrogen-containing n-layer, and an interface treatment layer formed on an opposite surface of the nitrogen-containing n-layer to the substrate, the nitrogen-containing n-layer comprises nitrogen atoms at an atomic concentration of not less than 1% and not more than 20%, and has a crystallization ratio of not less than 0 but less than 3, the interface treatment layer contacts the back-side transparent electrode layer, and the interface treatment layer has a crystallization ratio of not less than 1 and not more than 6, and has a conductivity of not less than 1 S/cm and not more than 100 S/cm.