Zhong Yang, Liu Gengling, Su Yang, Sheng Wangping, Gong Lingyun, Zhang Jiaqi, Tan Licheng, Chen Yiwang
College of Chemistry/Institute of Polymers and Energy Chemistry (IPEC), Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, China.
Institute of Advanced Scientific Research (iASR)/, Key Laboratory of Functional Organic Small Molecules for Ministry of Education, Jiangxi Normal University, 99 Ziyang Avenue, Nanchang, 330022, China.
Angew Chem Int Ed Engl. 2022 Jan 26;61(5):e202114588. doi: 10.1002/anie.202114588. Epub 2021 Dec 16.
The effects from the molecular configuration of diammonium spacer cations on 2D/3D perovskite properties are still unclear. Here, we investigated systematically the mechanism of molecular configuration-induced regulation of crystallization kinetic and carrier dynamics by employing various diammonium molecules to construct Dion-Jacobson (DJ)-type 2D/3D perovskites to further facilitating the photovoltaic performance. The minimum average Pb-I-Pb angle leads to the smallest octahedral tilting of [PbX ] lattice in optimal diammonium molecule-incorporated DJ-type 2D/3D perovskite, which enables suitable binding energy and hydrogen-bonding between spacer cations and inorganic [PbX ] cages, thus contributing to the formation of high-quality perovskite film with vertical crystal orientation, mitigatory lattice distortion and efficient carrier transportation. As a consequence, a dramatically improved device efficiency of 22.68 % is achieved with excellent moisture stability.
二铵间隔阳离子的分子构型对二维/三维钙钛矿性质的影响仍不明确。在此，我们通过使用各种二铵分子构建狄翁-雅各布森（DJ）型二维/三维钙钛矿，系统地研究了分子构型诱导的结晶动力学和载流子动力学调控机制，以进一步提升光伏性能。在掺入最佳二铵分子的DJ型二维/三维钙钛矿中，最小平均Pb-I-Pb角导致[PbX]晶格的八面体倾斜最小，这使得间隔阳离子与无机[PbX]笼之间具有合适的结合能和氢键，从而有助于形成具有垂直晶体取向、减轻晶格畸变和高效载流子传输的高质量钙钛矿薄膜。结果，实现了显著提高的22.68%的器件效率以及优异的湿度稳定性。
