Patent ID: 9685581
Date: 2017-06-20
CPC Classifications: H01L,Y02E,Y02P

Claim:
1. A manufacturing method of a solar cell having diffusion layers of different conductivity types respectively on a front surface of a semiconductor substrate and a back surface of the substrate, the method comprising: a step of forming a diffusion protection mask containing first impurities to cover one of the surfaces of the semiconductor substrate; and a diffusion step of performing a diffusion step including a thermal step of diffusing the first impurities and second impurities having a different conductivity type from that of the first impurities in a state where the one surface of the semiconductor substrate is covered with the diffusion protection mask containing the first impurities, forming a first-impurity diffusion layer on the one surface, and forming a second-impurity diffusion layer having a different conductivity type from that of the diffusion protection mask on the other surface of the semiconductor substrate.