[B-1-3] Epitaxial Solar Cells on Refined Metallurgical-Grade Silicon T. Warabisako、T. Saitoh、S. Matsubara、N. Nakamura、H. Itoh、T. Tokuyama (1.Central Research Laboratory, Hitachi Ltd.) https://doi.org/10.7567/SSDM.1978.B-1-3