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Method for Improving the Stability of Gen 5 Silicon Thin-film Tandem Solar Cell

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3 Author(s)
Ching-In Wu ; Institute of Microelectronics and Department of Electrical Engineering, Advanced Optoelectronic Technology Center, Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan, Taiwan ; Sheng-Po Chang ; Shoou-Jinn Chang

For silicon thin-film solar cells, it is well known that one of the most important methods for preparing amorphous silicon doped with hydrogen having good stability against light-soaking degradation is by properly tuning the H2 dilution ratio in the intrinsic i-layer. However, it is difficult to improve the longevity of a Gen 5 silicon thin-film tandem module by manipulating the H2 ratio within one i-layer alone because hydrogen treatment can easily compromise the front P-layer. To solve this problem, we propose the “graded i-layer” method, which incorporates multiple i-layers with different hydrogen dilution ratios in place of the original single i-layer. By this method, a solar cell could provide higher initial power, and the degradation ratio of the module could be reduced by approximately 2%.

Published in:

IEEE Journal of Photovoltaics  (Volume:3 ,  Issue: 4 )