Solar grade silicon materials and poly-silicon solar cell

摘要

In this paper, we should analyze the characteristic of the solar grade poly-silicon up-graded by physical process and make comparison with silicon made by Siemens process in wafer and solar cell, also we make a analysis for the degradation of the solar cell module. From the result we find that the silicon block have no obvious drawback such as crack detected by GT infrared and the average minority carrier lifetime is 3.86μs, the minority lifetime and resistivity of the wafer is better than the standard, solar cell prepared using the solar grade silicon wafer by physical process has an average conversion efficiency of 15.78% which is 0.12% higher than the Siemens wafer mainly due to high open circuit voltage. Efficiency degradation of the solar cell made by physical process is less than 3% after half an year which met the international standard. So we come to the conclusion that solar grade silicon prepared by physical process is a promising alternative material for PV industry and become main solar grade poly-silicon in the future.