Deng Hui, Sun Quanzhen, Yang Zhiyuan, Li Wangyang, Yan Qiong, Zhang Caixia, Zheng Qiao, Wang Xinghui, Lai Yunfeng, Cheng Shuying
College of Physics and Information Engineering, Institute of Micro-Nano Devices and Solar Cells, Fuzhou University, Fuzhou, China.
Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou, China.
Nat Commun. 2021 May 25;12(1):3107. doi: 10.1038/s41467-021-23343-1.
Environment-friendly flexible CuZnSn(S,Se) (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.
环境友好型柔性铜锌锡硫硒（CZTSSe）太阳能电池在室内光伏市场展现出巨大潜力。室内光照较弱且方向多向，因此光伏器件结构、技术及性能的研究面临新挑战。在此，我们在柔性钼箔衬底上设计对称双面CZTSSe太阳能电池，以高效收集室内能量。此类器件通过双面沉积技术制造，以确保双面一致性并节省成本。我们报道了柔性CZTSSe太阳能电池在标准太阳光下正面和背面的效率分别为9.3%和9%。考虑到室内环境，我们验证了器件在LED照明下的弱光响应性能以及数千次弯曲后的柔韧性。双面CZTSSe太阳能电池并联实现了来自多向光的双面输出电流叠加，显著提高了面积利用率。目前的结果和方法有望拓展室内光伏应用。
