PRIMARY AND SECONDARY PHOTOCURRENTS IN n-TYPE AND p-TYPE a-Si:H FILMS H.M. Welsch, W. Fuhs, K.H. Greeb et H. Mell J. Phys. Colloques, 42 C4 (1981) C4-567-C4-570 DOI: 10.1051/jphyscol:19814123