He Mingrui, Yan Chang, Li Jianjun, Suryawanshi Mahesh P, Kim Jinhyeok, Green Martin A, Hao Xiaojing
School of Photovoltaic and Renewable Energy Engineering University of New South Wales New South Wales Sydney NSW 2052 Australia.
Department of Materials Science and Engineering Chonnam National University Gwangju 61186 Republic of Korea.
Adv Sci (Weinh). 2021 Mar 3;8(9):2004313. doi: 10.1002/advs.202004313. eCollection 2021 May.
Earth-abundant and environmentally benign kesterite CuZnSn(S,Se) (CZTSSe) is a promising alternative to its cousin chalcopyrite Cu(In,Ga)(S,Se) (CIGS) for photovoltaic applications. However, the power conversion efficiency of CZTSSe solar cells has been stagnant at 12.6% for years, still far lower than that of CIGS (23.35%). In this report, insights into the latest cutting-edge strategies for further advance in the performance of kesterite solar cells is provided, particularly focusing on the postdeposition thermal treatment (for bare absorber, heterojunction, and completed device), alkali doping, and bandgap grading by engineering graded cation and/or anion alloying. These strategies, which have led to the step-change improvements in the power conversion efficiency of the counterpart CIGS solar cells, are also the most promising ones to achieve further efficiency breakthroughs for kesterite solar cells. Herein, the recent advances in kesterite solar cells along these pathways are reviewed, and more importantly, a comprehensive understanding of the underlying mechanisms is provided, and promising directions for the ongoing development of kesterite solar cells are proposed.
地球上储量丰富且环境友好的硫锡铜矿CuZnSn(S,Se)（CZTSSe）是其同族的黄铜矿Cu(In,Ga)(S,Se)（CIGS）在光伏应用中颇具前景的替代材料。然而，CZTSSe太阳能电池的功率转换效率多年来一直停滞在12.6%，仍远低于CIGS（23.35%）。在本报告中，我们深入探讨了用于进一步提高硫锡铜矿太阳能电池性能的最新前沿策略，尤其关注沉积后热处理（针对裸吸收层、异质结和完整器件）、碱掺杂以及通过工程化梯度阳离子和/或阴离子合金化实现的带隙分级。这些策略已使同类CIGS太阳能电池的功率转换效率实现了跨越式提升，也是实现硫锡铜矿太阳能电池进一步效率突破最具前景的策略。在此，我们回顾了硫锡铜矿太阳能电池沿这些途径的最新进展，更重要的是，提供了对其潜在机制的全面理解，并提出了硫锡铜矿太阳能电池当前发展的有前景方向。
