Li Haohui, Zhang Zheng, Wei Yuhao, An Bo, Liao Jia, Lv Xiangxue, Lv Weifeng, Yang Juncai, Li Haimin, Zeng Chengsong, Long Wu, Hu Yuchao, Zhang Yifeng, Long Wei, Xing Guoqiang, Liu Xingchong, Wang Hanyu
School of New Energy and Materials, Southwest Petroleum University, Chengdu, 610500, P. R.China.
Tongwei Solar (Chengdu) Co., LTD, Chengdu, 610207, P. R. China.
Adv Mater. 2025 Jun 25:e2501961. doi: 10.1002/adma.202501961.
Vapor-solution two-step deposition is recognized as a promising method to fabricate monolithic perovskite/silicon tandem solar cells (TSCs) on commercial silicon cell substrates with fully textured surfaces. Although a certified power conversion efficiency (PCE) of 31.3% is recorded for small size perovskite/silicon TSCs, scaling up from spin-coating used for small sizes to the slot-die for large areas has become the main challenge for its further mass production due to the residual PbI and increased internal voids in perovskite (PVK) films. In this study, sodium 2,5-difluorobenzoate (2,5-NaDPA) is utilized to reduce nucleation energy barrier difference at various convex angles on PbI layer, delaying the growth of perovskite crystals, and effectively promoting the grain size of perovskites, which is particularly favorable for perovskites deposited on commercial textured Si substrates. Eventually, the voids of large area PVK films are greatly restrained. A high efficiency of 28.28% is obtained from a fully textured perovskite/silicon tandem device prepared in ambient condition with an effective area of 19.9 cm. This work paves a new method for commercial production of large area perovskite/silicon TSCs.
汽相-溶液两步沉积法被认为是一种很有前景的方法，可用于在具有完全纹理化表面的商业硅电池基板上制备单片钙钛矿/硅串联太阳能电池（TSC）。尽管小尺寸钙钛矿/硅TSC的认证功率转换效率（PCE）达到了31.3%，但从用于小尺寸的旋涂法扩大到用于大面积的狭缝式模头涂布法，已成为其进一步大规模生产的主要挑战，这是由于钙钛矿（PVK）薄膜中存在残留的PbI以及内部空隙增加。在本研究中，2,5-二氟苯甲酸钠（2,5-NaDPA）被用于降低PbI层上不同凸角处的成核能垒差异，延缓钙钛矿晶体的生长，并有效促进钙钛矿的晶粒尺寸，这对于沉积在商业纹理化硅基板上的钙钛矿尤为有利。最终，大面积PVK薄膜的空隙得到了极大抑制。在环境条件下制备的有效面积为19.9平方厘米的完全纹理化钙钛矿/硅串联器件，获得了28.28%的高效率。这项工作为大面积钙钛矿/硅TSC的商业生产开辟了一种新方法。
