Persons

The problems in production of polycrystalline silicon for solar cells at present and in the nearest future have been considered. New progressive technologies, already realized in the pilot-scale production, as well as the recent original developments have been presented. In particular, the reduction of silicon oxides in the gas phase is a very promising process for production of high-purity silicon.

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The changes in the structure and phase composition of silicon monoxide in the disproportional reaction at high temperature with the formation of the Si nanocrystalline phase have been investigated. The nanocrystalline powder after separation from silicon oxide by powder diffraction and small-angle X-ray scattering has been studied. It has been found that under optimal conditions of the silicon monoxide heat treatment the obtained powder contains the nanosilicon particles of 17-20 nm size in the volume fraction of 40%.

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The technological process for the production of silicon nanopparticles from silicon monoxide, which permits to control the particle size in the 2-10 nm range, and the methods of nanosilicon coating for solar cells have been developed. It has been shown that the nanosilicon films are characterized by good anti-reflection and passivating properties and can be successfully used in the solar cell production technology.

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