Patent ID: 7667133
Filing Date: 2010-02-23
Classification: H01L,Y02E,Y02P

Abstract:
1. A novel photovoltaic solar cell comprising: at least one absorber layer, and at least one doped window layer having at least two p-type sub-window layers, wherein a first p-type sub-window layer is adjacent the absorber layer and forms a desirable junction with the absorber layer and wherein a second p-type sub-window layer is adjacent the first p-type sub-window layer and has high optical transmission; wherein the absorber layer comprises at least one of amorphous silicon (a-Si:H), amorphous silicon germanium (a-Si the first and second p-type sub-window layers each being comprised of nanocrystalline silicon; wherein the second p-type sub-window layer has a transparency and a thickness that are both greater than the transparency and the thickness of the first p-type sub-window layer.