Patent ID: 9419168
Filing Date: 2016-08-16
CPC Classification: H01L,Y02E

Claim Text:
1. A method of manufacturing a solar cell including a substrate made of a crystalline semiconductor material, comprising: depositing a p-type semiconductor layer containing boron on at least part of a first principal surface of the substrate, thereby protecting the at least part of the first principal surface to a subsequent etching or washing step; etching or washing at least part of a second principal surface of the substrate by subjecting the at least part of the second principal surface to a treatment with an aqueous alkaline solution; patterning the p-type semiconductor layer by removing a part of the p-type semiconductor layer after the treatment with the aqueous alkaline solution; and forming electrodes on the pattered p-type semiconductor layer and on an exposed area that is exposed through the removed part of the p-type semiconductor layer, respectively, and forming a semiconductor junction, wherein forming a new semiconductor layer containing boron at a lower concentration than that in the p-type semiconductor layer, on the first principal surface to form the semiconductor junction, after the removing step.