Patent ID: 8722453

Claim:
A method for manufacturing a photovoltaic device comprising: an impurity-diffusion-layer forming step of forming an impurity diffusion layer having a second conductivity type impurity diffused thereon at a first principal surface side of a first conductivity type silicon substrate; a reflection-prevention-film forming step of forming a reflection prevention film on the impurity diffusion layer; a back-surface passivation-film forming step of forming a back-surface passivation film made of an SiONH film on a second principal surface of the silicon substrate; a front-surface-electrode shape forming step of forming a paste material containing silver in a front-surface electrode shape on the reflection prevention film; a front-surface-electrode forming step of forming a front surface electrode that is contacted to the impurity diffusion layer by sintering the silicon substrate; a back-surface-electrode shape forming step of forming a paste material containing a metal as a back-surface electrode shape, on the second principal surface of the silicon substrate; and a back-surface electrode forming step of forming a back surface electrode by melting a metal in the paste material by irradiating laser light onto a forming position of the back surface electrode and by solidifying the molten metal; wherein the back-surface-electrode shape forming step includes: a step of providing an opening of the back-surface electrode shape on the back-surface passivation film; and a step of forming the paste material containing the metal on the opening; and the back-surface electrode forming step includes: a step of forming the back-surface electrode on the opening by melting the metal in the paste material by irradiating laser light onto a forming position of the opening and by solidifying the molten metal, to form the back-surface electrode consisting of an Al—Si layer with the silicon substrate at a base.