噻吩阳离子插层以改善低维钙钛矿中的带边完整性
Thiophene Cation Intercalation to Improve Band-Edge Integrity in Reduced-Dimensional Perovskites.
作者信息
Ni Chuyi, Huang Yahao, Zeng Tao, Chen Daohong, Chen Hao, Wei Mingyang, Johnston Andrew, Proppe Andrew H, Ning Zhijun, Sargent Edward H, Hu Peng, Yang Zhenyu
机构信息
MOE Laboratory of Bioinorganic and Synthetic Chemistry, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-sen University, Guangzhou, Guangdong, 510275, China.
Department of Chemistry, York University, Toronto, Ontario, M3J1P3, Canada.
出版信息
Angew Chem Int Ed Engl. 2020 Aug 10;59(33):13977-13983. doi: 10.1002/anie.202006112. Epub 2020 Jun 4.
The insertion of large organic cations in metal halide perovskites with reduced-dimensional (RD) crystal structures increases crystal formation energy and regulates the growth orientation of the inorganic domains. However, the power conversion performance is curtailed by the insulating nature of the bulky cations. Now a series of RD perovskites with 2-thiophenmethylammonium (TMA) as the intercalating cation are investigated. Compared with traditional ligands, TMA demonstrates improved electron transfer in the inorganic framework. TMA modifies the near-band-edge integrity of the RD perovskite, improving hole transport. A power conversion efficiency of 19 % is achieved, the highest to date for TMA-based RD perovskite photovoltaics; these TMA devices provide a 12 % relative increase in PCE compared to control RD perovskite devices that use PEA as the intercalating ligand, a result of the improved charge transfer from the inorganic layer to the organic ligands.
在具有低维（RD）晶体结构的金属卤化物钙钛矿中插入大的有机阳离子会增加晶体形成能，并调节无机域的生长取向。然而，大体积阳离子的绝缘性质限制了功率转换性能。现在研究了一系列以2-噻吩甲基铵（TMA）作为插层阳离子的RD钙钛矿。与传统配体相比，TMA在无机框架中表现出改善的电子转移。TMA改变了RD钙钛矿的近带边完整性，改善了空穴传输。实现了19%的功率转换效率，这是迄今为止基于TMA的RD钙钛矿光伏器件的最高效率；与使用PEA作为插层配体的对照RD钙钛矿器件相比，这些TMA器件的功率转换效率相对提高了12%，这是无机层到有机配体电荷转移改善的结果。
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