ELECTRON POWDER RIBBON POLYCRYSTALLINE SILICON PLATES USED FOR POROUSLAYER FABRICATION

Electron powder ribbon (EPR) plates elaborated from 99.9%-99.9999% pur e silicon powder show crystallographic structure favourable to the ach ievement of nanocrystallites which are at the origin of luminescence. Fourier transform IR spectrometry and secondary ion mass spectrometry observations correlated with the comparative luminescence of porous la yers produced on single-crystal and EPR polycrystalline silicon are ca rried out. The luminescence spectra are controlled by a combination of the electrochemical parameters and the starting material resistivity. An electroluminescent cell is elaborated and microcrystalline structu res are obtained for sensor applications using the adsorption process (e.g. moisture measurements).