Patent ID: 8735715

Claim:
A method for manufacturing a photovoltaic device, the method comprising: forming a first electrode by depositing a transparent conductive oxide layer on a substrate, a surface of the transparent conductive oxide layer being formed with peaks having a height; etching the surface of the transparent conductive oxide layer sufficient to smooth the peaks of the transparent conductive oxide layer, the peaks being reduced in height; forming a first unit cell comprising a p-type semiconductor layer, an intrinsic semiconductor layer and an n-type semiconductor layer, each of which is sequentially stacked on the first electrode; forming a second unit cell comprising a p-type semiconductor layer, an intrinsic semiconductor layer and an n-type semiconductor layer, each of which is sequentially stacked on the first unit cell; and forming a second electrode on the second unit cell, wherein the intrinsic semiconductor layer of the first unit cell includes hydrogenated amorphous silicon or hydrogenated amorphous silicon based material, wherein the intrinsic semiconductor layer of the second unit cell includes hydrogenated microcrystalline silicon or hydrogenated microcrystalline silicon based material, wherein a ratio of a root mean square roughness to an average pitch of a texturing structure formed on the surface of the first electrode is equal to or more than 0.05 and equal to or less than 0.13, and wherein the forming the first electrode produces V-shaped valleys between the peaks, and the etching changes the V-shaped valleys to U-shaped valleys.