Robust Stability of Efficient Lead-Free Formamidinium Tin Iodide Perovskite Solar Cells Realized by Structural Regulation
Robust Stability of Efficient Lead-Free Formamidinium Tin Iodide Perovskite Solar Cells Realized by Structural Regulation
复制标题
通过结构调控实现高效无铅甲脒锡碘化物钙钛矿太阳能电池的鲁棒稳定性
DOI：
10.1021/acs.jpclett.8b03194
复制
发表时间：
2018-12-20
影响因子：
5.7
通讯作者：
Wu, Zhaoxin
中科院分区：
文献类型：
--
作者：
Gao, Weiyin;Ran, Chenxin;Wu, Zhaoxin
无铅锡基钙钛矿的不稳定性问题是其在光电器件中应用的最大挑战之一。本文展示了一种结构调节策略来调节碘化甲脒（FASnI(3)）钙钛矿的几何对称性。实验和理论研究表明，铯离子（Cs+）的引入可以改善FASnI的几何对称性，抑制Sn2+的氧化，增强其热力学结构的稳定性(3)。结果表明，倒置平面掺cs的FASnI(3)基钙钛矿太阳能电池（PSC）在N-2中储存2000 h后仍能保持90%的初始功率转换效率（PCE），这是迄今为止3D sn基PSC的最佳耐久性。最重要的是，Cs掺杂后PSCs的空气稳定性、热稳定性和照明稳定性都得到了改善。由于cs掺杂的FASnI(3)薄膜质量的提高，PSC的PCE比对照器件提高了63%（从3.74%提高到6.08%）。
The instability issue of Pb-free Sn-based perovskite is one of the biggest challenges for its application in optoelectronic devices. Herein, a structural regulation strategy is demonstrated to regulate the geometric symmetry of formamidiniumtin iodide (FASnI(3)) perovskite. Experimental and theoretical works show that the introduction of cesium cation (Cs+) could improve the geometric symmetry, suppress the oxidation of Sn2+, and enhance the thermodynamical structural stability of FASnI(3). As a result, the inverted planar Cs-doped FASnI(3)-based perovskite solar cell (PSC) is shown to maintain 90% of its initial power-conversion efficiency (PCE) after 2000 h stored in N-2, which is the best durability to date for 3D Sn-based PSCs. Most importantly, the air, thermal, and illumination stabilities of the PSCs are all improved after Cs doping. The PCE of the Cs-doped PSC shows a 63% increase compared to that of the control device (from 3.74% to 6.08%) due to the improved quality of the Cs-doped FASnI(3) film.