Patent ID: 6653554
Filing Date: 2003-11-25
Classification: H01L,Y02E,Y02P

Abstract:
A thin film polycrystalline solar cell comprising a substrate; a first semiconductor layer provided on the substrate and comprised of Si highly doped with a conductivity-type controlling impurity; a second semiconductor layer provided on the first semiconductor layer and comprised of polycrystalline Si slightly doped with a conductivity-type controlling impurity of the same conductivity-type as that of the first semiconductor layer; and a third semiconductor layer provided on the second semiconductor layer and highly doped with a conductivity-type controlling impurity of a conductivity-type opposite to that of the impurities for the doping of the first and the second semiconductor layers, wherein crystal grains grown from crystal nuclei generated in the first semiconductor layer are continuously grown to form the first and the second semiconductor layers, are also horizontally grown to contact neighboring crystal grains, and are perpendicularly grown to form an interface with the third semiconductor layer, and wherein a portion of the first semiconductor layer which forms an interface with the substrate comprises amorphous silicon.