Patent ID: 9450138
Filing Date: 2016-09-20
CPC Classification: H01L,Y02E,Y02P

Claim Text:
1. A photovoltaic cell manufacturing method comprising: depositing a first buffer layer for performing lattice relaxation on a first silicon substrate; depositing a first photoelectric conversion cell on the first buffer layer, the first photoelectric conversion cell being formed with a compound semiconductor including a pn junction, and the first photoelectric conversion cell having a lattice constant that is higher than that of silicon; connecting a support substrate to the first photoelectric conversion cell to form a first layered body; removing the first buffer layer and the first silicon substrate from the first layered body; depositing a second buffer layer for performing lattice relaxation on a second silicon substrate; depositing a second photoelectric conversion cell on the second buffer layer, the second photoelectric conversion cell being formed with a compound semiconductor including a pn junction, and the second photoelectric conversion cell having a lattice constant that is higher than that of silicon and different from that of the first photoelectric conversion cell; forming a second layered body by joining the first photoelectric conversion cell of the first layered body and the second photoelectric conversion cell, the second layered body including the first silicon substrate, the first buffer layer, the first photoelectric conversion cell, the second photoelectric conversion cell, the second buffer layer, and the second silicon substrate; and removing the second buffer layer and the second silicon substrate, wherein the removing of the first buffer layer and the first silicon substrate from the first photoelectric conversion cell includes removing the first buffer layer and the first silicon substrate included in the second layered body, the connecting of the support substrate to the first photoelectric conversion cell includes connecting the support substrate to the first photoelectric conversion cell included in a third layered body formed by removing the first silicon substrate and the first buffer layer from the second layered body, and the removing of the second buffer layer and the second silicon substrate includes removing the second buffer layer and the second silicon substrate from the third layered body to which the support substrate is connected.