Z E. Smith, V. Chu, K. Shepard, S. Aljishi, D. Slobodin, J. Kolodzey, S. Wagner and T. L. Chu “Photothermal and photoconductive determination of surface and bulk defect densities in amorphous silicon films” Appl. Phys. Lett. 50, 1521 (1987)
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Kenneth Shepard
Professor of Electrical Engineering
Columbia University
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