Novel symmetrical bifacial flexible CZTSSe thin film solar cells for indoor photovoltaic applications

Hui Deng, Quanzhen Sun, Zhiyuan Yang, Wangyang Li, Qiong Yan, Caixia Zhang, Qiao Zheng, Xinghui Wang, Yunfeng Lai and Shuying Cheng ()
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Hui Deng: Fuzhou University
Quanzhen Sun: Fuzhou University
Zhiyuan Yang: Fuzhou University
Wangyang Li: Fuzhou University
Qiong Yan: Fuzhou University
Caixia Zhang: Fuzhou University
Qiao Zheng: Fuzhou University
Xinghui Wang: Fuzhou University
Yunfeng Lai: Fuzhou University
Shuying Cheng: Fuzhou University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Environment-friendly flexible Cu2ZnSn(S,Se)4 (CZTSSe) solar cells show great potentials for indoor photovoltaic market. Indoor lighting is weak and multi-directional, thus the researches of photovoltaic device structures, techniques and performances face new challenges. Here, we design symmetrical bifacial CZTSSe solar cells on flexible Mo-foil substrate to efficiently harvest the indoor energy. Such devices are fabricated by double-sided deposition techniques to ensure bifacial consistency and save cost. We report 9.3% and 9% efficiencies for the front and back sides of the flexible CZTSSe solar cell under the standard sun light. Considering the indoor environment, we verify weak-light response performance of the devices under LED illumination and flexibility properties after thousands of bending. Bifacial CZTSSe solar cells in parallel achieve the superposition of double-sided output current from multi-directional light, significantly enhancing the area utilization rate. The present results and methods are expected to expand indoor photovoltaic applications.

Date: 2021
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DOI: 10.1038/s41467-021-23343-1

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