Żuraw Wiktor, Kubicki Dominik, Kudrawiec Robert, Przypis Łukasz
Department of Semiconductor Materials Engineering, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland.
Saule Research Institute, Dunska 11, 54-427 Wroclaw, Poland.
ACS Energy Lett. 2024 Aug 22;9(9):4509-4515. doi: 10.1021/acsenergylett.4c02027. eCollection 2024 Sep 13.
Despite significant progress in tin-based perovskites, the development of stable and high-performance tin-based perovskite solar cells (TPSCs) remains a challenge. In this pursuit, a multitude of strategies have been explored, encompassing the use of reducing agents, antioxidants, bulky cations, and customized solvent systems. We propose an improved approach for synthesizing SnI from elemental tin and iodine. Here, we generate tin nanoparticles grafted with a carboxylic acid from tin powder-carboxylic acid-assisted synthesis (CAAS). This methodology not only improves the synthesis process of SnI but also enhances precursor stability against oxidation. We use Sn MAS NMR to study the atomic-level structure of the resulting FASnI thin films and find that the CAAS approach leads to highly pure and unoxidized material. We report remarkable reproducibility in fabricating large-area (1 cm) flexible TPSCs with significant improvement in open-circuit voltage leading to the champion device showing a power conversion efficiency of 8.35%.
尽管锡基钙钛矿取得了显著进展，但开发稳定且高性能的锡基钙钛矿太阳能电池（TPSCs）仍然是一项挑战。在这一探索过程中，人们已经探索了多种策略，包括使用还原剂、抗氧化剂、体积较大的阳离子和定制的溶剂体系。我们提出了一种从元素锡和碘合成SnI的改进方法。在这里，我们通过锡粉-羧酸辅助合成法（CAAS）生成接枝有羧酸的锡纳米颗粒。这种方法不仅改进了SnI的合成过程，还提高了前驱体的抗氧化稳定性。我们使用Sn MAS NMR研究所得FASnI薄膜的原子级结构，发现CAAS方法可得到高纯度且未氧化的材料。我们报告了在制造大面积（1平方厘米）柔性TPSCs方面具有显著的可重复性，开路电压有显著提高，领先的器件显示出8.35%的功率转换效率。
