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The rapidly reversible processes of activation and deactivation in amorphous silicon heterojunction solar cell under extensive light soaking
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The rapidly reversible processes of activation and deactivation in amorphous silicon heterojunction solar cell under extensive light soaking
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Journal Article
The rapidly reversible processes of activation and deactivation in amorphous silicon heterojunction solar cell under extensive light soaking
2021
Overview
Silicon heterojunction (HJT) solar cells use hydrogenated amorphous silicon (a-Si:H) to form passivating contacts. To obtain high performance, many crucial applications have been confirmed and introduced. In this work, extensive light soaking (ELS) was used to comprehensively investigate a-Si:H films and HJT solar cells. The enhanced effective minority carrier lifetime (
τ
eff
) for c-Si wafers passivated with a-Si:H was achieved via extensive light soaking, and the passivation enhancement can reach saturation in few seconds. It was observed that there was a significant contribution of low thermal annealing (LTA) process, excellently improving the ultimate passivation function of ELS. A comparison of c-Si wafers passivated with different a-Si stacks under various temperatures was examined, and the activation and deactivation performance during repeated extensive light soaking-low thermal annealing cycles was systematically discussed. Finally, the reversibility of efficiency enhancement and degradation in HJT solar cells related to extensive light soaking-low thermal annealing cycles was demonstrated for the first time.
Publisher
Springer US,Springer Nature B.V
