Grain Boundary Characterization in Polysilicon by Light Beam Induced Current Topography and Image Processing


A high performance light-beam-induced-current (LBIC) analyser has been used to determine the recombination velocity at the grain boundary (S) and the minority-carrier diffusion length (L). For this purpose a Schottky diode (Cr/Si) was fabricated using a p-type silicon bicrystal (1 Ω cm, Σ13 grain boundary). The contacts were obtained by a “cold” technology. The diffusion length, determined by the method proposed by Ioannou, was subsequently fitted into the model proposed by Marek to evaluate the recombination velocity by the curve-fitting of the experimental and theoretical photocurrent profiles. A value of S = 1.104 cm/s was thus obtained. The influence of the thin oxide layer at the Cr/Si interface is also discussed.

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Masri, K., Boyeaux, J.P., Kumar, S.N. et al. Grain Boundary Characterization in Polysilicon by Light Beam Induced Current Topography and Image Processing. MRS Online Proceedings Library 106, 89 (1987).

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