Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
79285 | Solar Energy Materials and Solar Cells | 2012 | 8 Pages |
The minority-carrier lifetime in p-type solar-grade silicon (SoG-Si) produced by Elkem Solar was investigated after different types of heat treatment. Two groups of samples differing by the as-grown lifetimes were exposed to internal and phosphorus gettering using constant and variable temperature processes. Optimal heat-treatment parameters for each group of samples were then identified which improved the minority-carrier lifetimes to values higher than the minimum value needed for solar cells. Phosphorus gettering using a variable temperature process enhanced in particular the lifetime within each group, increasing in certain cases the lifetime from 3 up to 81 μs.
► Internal and phosphorus gettering considerably enhances the lifetime in Elkem SoG-Si. ► Variable-temperature processes are more effective than constant-temperature ones. ► Lifetime may be increased by a factor of 20 after variable-temperature P-gettering. ► Optimal temperature for constant-temperature processes varies between 800 and 930 °C. ► Maximum temperature for variable-temperature processes is between 1100 and 1200 °C.