Patent ID: 8748736
Filing Date: 2014-06-10
Classification: H01L,Y02E

Abstract:
1. A method of fabricating a backside contact solar cell, the method comprising: texturing a surface of a silicon substrate on a front side of a backside contact solar cell to create a textured front side surface, the backside contact solar cell having diffusion regions and metal contacts electrically coupled to the diffusion regions on a backside opposite the front side, the front side facing the sun during normal operation to collect solar radiation; forming a passivation layer over the textured front side surface; and forming an anti-reflective structure over the passivation layer, the anti-reflective structure comprising an amorphous silicon layer formed over the passivation layer and a silicon nitride layer formed over the amorphous silicon layer, the amorphous silicon layer being formed between the passivation layer and the silicon nitride layer, wherein the silicon nitride layer has an extinction coefficient of at most 0.03 to light at wavelengths of 400 nm or longer and the amorphous silicon layer is formed to block at least 25% of solar radiation coming in from the front side of the backside contact solar cell.