Cao Kun, Cheng Yangfeng, Chen Junwen, Huang Yue, Ge Mengru, Qian Jie, Liu Lihui, Feng Jing, Chen Shufen, Huang Wei
Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
ACS Appl Mater Interfaces. 2020 Sep 16;12(37):41454-41463. doi: 10.1021/acsami.0c11253. Epub 2020 Sep 3.
Although rapid progress has been made in tin-based perovskite solar cells (PSCs), the inferior film qualities of the solution-processed perovskites always lead to poor reproducibility and instability. Herein, we present a simple seeded growth (SG) approach to obtain high-quality tin-based perovskite films with preferred crystal orientation, large grain sizes, and fewer apparent grain boundaries. High-quality tin-based perovskite films fabricated through this SG process could greatly reduce the nonradiative recombination centers and inhibit the oxidation of Sn. Using formamidinium tin tri-iodide (FASnI) perovskites, the SG-PSCs exhibit a much improved efficiency from 5.37% (control) to 7.32% with all improved photovoltaic parameters. Moreover, this SG strategy is easily applicable to other tin-based perovskite compositions. The PSC based on methylammonium (MA) doped mixed-cation perovskite (FAMASnI) exhibited a power conversion efficiency (PCE) of 8.54% with an improvement of 19.3% in the photovoltaic performance, making it a general approach for achieving efficient tin-based PSCs.
尽管锡基钙钛矿太阳能电池（PSC）已取得快速进展，但溶液法制备的钙钛矿较差的薄膜质量总是导致可重复性差和稳定性不佳。在此，我们提出一种简单的籽晶生长（SG）方法，以获得具有择优晶体取向、大晶粒尺寸和较少明显晶界的高质量锡基钙钛矿薄膜。通过这种SG工艺制备的高质量锡基钙钛矿薄膜可大大减少非辐射复合中心并抑制Sn的氧化。使用甲脒锡三碘化物（FASnI）钙钛矿，SG-PSC的效率从5.37%（对照）大幅提高到7.32%，所有光伏参数均得到改善。此外，这种SG策略很容易应用于其他锡基钙钛矿组合物。基于甲基铵（MA）掺杂的混合阳离子钙钛矿（FAMASnI）的PSC表现出8.54%的功率转换效率（PCE），光伏性能提高了19.3%，使其成为实现高效锡基PSC的通用方法。
