SOME NEW DEVELOPMENTS IN THE FIELD OF AMORPHOUS SILICON SOLAR CELLS W.E. Spear, R.A. Gibson, D. Yang, P.G. Lecomber, G. Müller and S. Kalbitzer J. Phys. Colloques, 42 C4 (1981) C4-1143-C4-1153 DOI: 10.1051/jphyscol:19814245