Li Zhimin, Liu Ning, Meng Ke, Liu Zhou, Hu Youdi, Xu Qiaofei, Wang Xiao, Li Shunde, Cheng Lei, Chen Gang
School of Physical Science and Technology , ShanghaiTech University , Shanghai 201210 , China.
School of Environment and Architecture , University of Shanghai for Science and Technology , Shanghai 200093 , China.
Nano Lett. 2019 Aug 14;19(8):5237-5245. doi: 10.1021/acs.nanolett.9b01652. Epub 2019 Aug 6.
Two-dimensional (2D) perovskite materials have exhibited great possibilities toward the fabrication of highly efficient and stable solar cell devices. The large degree of structural versatility due to the viable choices of organic interlayer spacers promises new and valuable 2D perovskite species. Herein, phenyltrimethylammonium (PTA) is successfully employed as the organic interlayer spacer to prepare the 2D Ruddlesden-Popper perovskite films that exhibit exceptional optoelectronic properties. By adding Cl ions during film growth, the (PTA)(MA)PbI (MA = methylammonium) perovskite films are effectively prepared with a tunable crystal orientation and film morphology. The optimized devices fabricated with the assistance of Cl ions deliver the power conversion efficiency up to 11.53%, which is ascribed to the simultaneous reductions of charge transfer resistance and defect-induced charge recombination. Moreover, the PTA-based 2D perovskite solar cells demonstrate remarkable environmental and thermal stabilities.
二维（2D）钙钛矿材料在制造高效稳定的太阳能电池器件方面展现出了巨大潜力。由于有机层间间隔物的多种可行选择，其具有高度的结构多样性，有望产生新的有价值的二维钙钛矿物种。在此，苯基三甲基铵（PTA）成功用作有机层间间隔物，以制备具有优异光电性能的二维Ruddlesden-Popper钙钛矿薄膜。通过在薄膜生长过程中添加氯离子，有效地制备了具有可调晶体取向和薄膜形态的（PTA）（MA）PbI（MA = 甲铵）钙钛矿薄膜。在氯离子辅助下制备的优化器件的功率转换效率高达11.53%，这归因于电荷转移电阻和缺陷诱导的电荷复合的同时降低。此外，基于PTA的二维钙钛矿太阳能电池表现出显著的环境和热稳定性。
