Photovoltaic Cells Based on Silicon with Binary Compounds GexSi1–x

Abstract

In this paper, the results of the study of photoelectric properties of silicon with binary compounds GexSi1–x are presented. The thermodynamic conditions (Т = 1100–1250°С and t = 5–20 h) and technological modes were determined for low-temperature, two-stage diffusion of impurity atoms of germanium, which made it possible to obtain a material with binary compounds Ge_xSi_1–x on the surface and near-surface of silicon with given electrophysical parameters. From the results of the study of the concentration distribution of the formed binary compounds Ge_xSi_1–x in silicon, it was established that compounds with the maximum concentration were formed on the surface, and their concentration decreased with depth into the volume of silicon. It was found that the compounds Ge_xSi_1–x formed in silicon lead to a change in the forbidden zone width of the original material. It is shown that the change in the forbidden zone width of the original silicon due to the formation of binary compounds Ge_xSi_1–x changes one of the fundamental parameters of the material, which, in turn, leads to an expansion of the spectral region of sensitivity, which is typical in the development of efficient photocells with a wide range of solar radiation absorption.