A THEORETICAL STUDY OF HYDROGEN EXODIFFUSION IN a-Si : H, COMPARISON WITH CONDUCTIVITY MEASUREMENTS K. Zellama, P. Germain, C. Picard et B. Bourdon J. Phys. Colloques, 42 C4 (1981) C4-815-C4-818 DOI: 10.1051/jphyscol:19814179