Zhang Mingyu, Dai Shuixing, Chandrabose Sreelakshmi, Chen Kai, Liu Kuan, Qin Minchao, Lu Xinhui, Hodgkiss Justin M, Zhou Huanping, Zhan Xiaowei
Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education , Peking University , Beijing 100871 , China.
MacDiarmid Institute for Advanced Materials and Nanotechnology and School of Chemical and Physical Sciences , Victoria University of Wellington , Wellington 6010 , New Zealand.
J Am Chem Soc. 2018 Nov 7;140(44):14938-14944. doi: 10.1021/jacs.8b09300. Epub 2018 Oct 24.
We report the fused ring electron acceptor (FREA)-perovskite hybrid as a promising platform to fabricate organic-inorganic hybrid solar cells with simple preparation, high efficiency, and good stability. The FREA-perovskite hybrid films exhibit larger grain sizes and stronger crystallinity than the pristine perovskite films. Moreover, the FREA molecules can form coordination bonding with undercoordinated Pb atoms and passivate the trap states in the perovskite films. Time-resolved photoluminescence and transient absorption measurements reveal that FREA facilitates efficient electron extraction and collection. Transient photocurrent and photovoltage measurements suggest faster charge transfer and reduced charge recombination in solar cells based on FREA-perovskite hybrid films. Consequently, solar cells based on FREA-perovskite hybrid films yield a champion efficiency of 21.7% with enhanced stability, which is higher than that of the control devices based on pristine perovskite films (19.6%).
我们报道了稠环电子受体（FREA）-钙钛矿杂化物，它是一个很有前景的平台，可用于制备制备简单、效率高且稳定性好的有机-无机杂化太阳能电池。与原始钙钛矿薄膜相比，FREA-钙钛矿杂化薄膜具有更大的晶粒尺寸和更强的结晶度。此外，FREA分子可以与配位不足的Pb原子形成配位键，并钝化钙钛矿薄膜中的陷阱态。时间分辨光致发光和瞬态吸收测量表明，FREA促进了有效的电子提取和收集。瞬态光电流和光电压测量表明，基于FREA-钙钛矿杂化薄膜的太阳能电池中电荷转移更快，电荷复合减少。因此，基于FREA-钙钛矿杂化薄膜的太阳能电池的最高效率为21.7%，稳定性增强，高于基于原始钙钛矿薄膜的对照器件（19.6%）。
