TANDEM TYPE SOLAR CELLS USING a-Si : H AND a-SiGe : H FILMS G. Nakamura, K. Sato, H. Kondo, Y. Yukimoto and K. ShirahataJ. Phys. Colloques, 42 C4 (1981) C4-483-C4-486DOI: https://doi.org/10.1051/jphyscol:19814102
