THE ENHANCEMENT OF THE DARK CONDUCTIVITY AND PHOTOCONDUCTIVITY OF GD a-Si INTRODUCING O2, N2 Wen Yuan Xu, Zhong Lin Sun, Zhong Pang Wang et De Lin Lee J. Phys. Colloques, 42 C4 (1981) C4-695-C4-698 DOI: 10.1051/jphyscol:19814154