Xu Aoqi, Li Xinyu, Liu Hongkun, Xiang Chunxu, Ma Chengfeng, Li Yize, Pan Xiangyu, Yan Weibo, Wang Shaoying, Huang Wei, Xin Hao
Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications (NJUPT), 9 Wenyuan Road, Nanjing, 210023, P. R. China.
Small. 2025 Jan;21(1):e2407075. doi: 10.1002/smll.202407075. Epub 2024 Oct 21.
The environmentally friendly elements composed of high bandgap pure sulfide CuZnSnS (CZTS) semiconductor has broad prospects for building integrated photovoltaic, double-sided, and semi-transparent solar cells when fabricated on transparent substrates. The key issues limiting the performance of CZTS solar cells are poor absorber quality and unfavorable band energy alignment causing serious charge carrier recombination. Here, thefabrication of CZTS solar cells are reported on fluorine-doped tin oxide (FTO) substrates from dimethyl sulfoxide solution and the effects of the Cd and Ag alloying on device performance. Characterizations show that Cd alloying greatly decreases defect concentration and converts Cliff-type band alignment to favorable Spike-type, leading to greatly improved current density. Further, Ag alloying eliminates near-horizontal grain boundaries and passivates defects in both bulk and heterojunction interface, resulting in a champion device with a power conversion efficiency of 10.3%, the highest efficiency pure sulfide CZTS solar cell on FTO substrate. The results demonstrate the great application potential of pure sulfide kesterite solar cells.
由高带隙纯硫化物铜锌锡硫（CZTS）半导体组成的环保元素，在透明基板上制造时，对于构建集成光伏、双面和半透明太阳能电池具有广阔前景。限制CZTS太阳能电池性能的关键问题是吸收体质量差以及不利的能带能量对准导致严重的电荷载流子复合。在此，报道了在氟掺杂氧化锡（FTO）基板上由二甲基亚砜溶液制备CZTS太阳能电池以及镉和银合金化对器件性能的影响。表征表明，镉合金化大大降低了缺陷浓度，并将悬崖型能带对准转变为有利的尖峰型，从而导致电流密度大大提高。此外，银合金化消除了近水平晶界，并钝化了体相和异质结界面中的缺陷，从而得到了一个功率转换效率为10.3%的冠军器件，这是FTO基板上效率最高的纯硫化物CZTS太阳能电池。结果证明了纯硫化物锡基硫族化合物太阳能电池具有巨大的应用潜力。
