DENSITY OF STATES STUDY IN SPUTTERED a-Si : H : EFFECT OF IMPURITIES AND H RELATED DEFECTS P. Viktorovitch, G. Moddel, J. Blake, S. Oguz, R.L. Weisfield et W. Paul J. Phys. Colloques, 42 C4 (1981) C4-455-C4-458 DOI: 10.1051/jphyscol:1981495