Study and development of rear‐emitter Si heterojunction solar cells and application of direct copper metallization

We have presented a comprehensive study on the development of rear emitter silicon heterojunction (SHJ) solar cells, which shows more freedom for device optimization than the standard front emitter SHJ counterparts. The optimization of the p‐type hydrogenated amorphous silicon (a‐Si:H(p)) layer is l...

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Veröffentlicht in:Progress in photovoltaics 2018-06, Vol.26 (6), p.385-396
Hauptverfasser: Yang, Lifei, Zhong, Sihua, Zhang, Wenbin, Li, Xingbing, Li, Zhengping, Zhuang, Yufeng, Wang, Xin, Zhao, Lei, Cao, Xinmin, Deng, Xunming, Wang, Qi, Shen, Wenzhong
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Sprache:eng
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Zusammenfassung:We have presented a comprehensive study on the development of rear emitter silicon heterojunction (SHJ) solar cells, which shows more freedom for device optimization than the standard front emitter SHJ counterparts. The optimization of the p‐type hydrogenated amorphous silicon (a‐Si:H(p)) layer is liberated from the parasitic absorption issue, while the n‐type hydrogenated amorphous silicon (a‐Si:H(n)) layer is optimized considering the tradeoff between the light absorption loss and field‐effect passivation. The front transparent conductive oxide (TCO) layer can be designed stressing on its optical properties because the lateral transport of the majority carriers at the front side of the cell is supported by the Si substrate, while the rear TCO layer is free to be tuned for suppressing the TCO/a‐Si:H(p) contact resistance. A rear emitter SHJ solar cell (225.47 cm2) fabricated by industry compatible process has been achieved with an efficiency of over 22%. We have further demonstrated the replacement of screen‐printed silver metallization with a low cost direct copper metallization in the rear emitter SHJ solar cells. We report an exciting 22.06% cell efficiency which is comparable to that of the screen‐printed counterpart. A comprehensive study on the development of rear emitter silicon heterojunction (SHJ) solar cells has been presented, which shows more freedom for optimization than the standard front emitter SHJ counterparts. Furthermore, direct copper metallization has been successfully applied to the rear emitter SHJ solar cell, achieving an efficiency of 22.06%, which is comparable to that of the screen‐printed counterpart. The study shows a promising approach for the mass production of SHJ solar cells with high efficiency and low cost.
ISSN:1062-7995
1099-159X
DOI:10.1002/pip.3000