Fabrication and Properties of Diffused Solar Cells Using Solar-Grade Silicon Prepared by a Fluidized-Bed Reactor

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Abstract
New solar-grade silicon materials for low cost solar cells are prepared by the hydrogen reduction of chlorosilane gases in a fluidized-bed reactor. Diffused cells are fabricated from 2-inch pulled crystals made from the materials. A high conversion efficiency of 11.3% is obtained from the silicon materials prepared using SiCl4 gas. Diffused cells are also fabricated from purified SiHCl3 gas to investigate the performance of the fluidized-bed reactor, and a maximum conversion efficiency of 13.3 % is obtained. Inhomogeneities in the solar cells are revealed by characterizing laser-beam induced current images and photoresponse variation with illumination intensity. The solar-grade silicon materials are highly promising due to their higher cell performance and lower power consumption in material preparation.

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