EVOLUTIONS OF GRAIN BOUNDARY RECOMBINATION ACTIVITY IN POLYCRYSTALLINE SILICON INVESTIGATED BY LBIC MAPPING AND DLTS M. PASQUINELLI, N. M'GAFFAD, H. AMANRICH and S. MARTINUZZI J. Phys. Colloques, 50 C6 (1989) C6-160 DOI: 10.1051/jphyscol:1989620