Xia Yongkang, Chen Xiayan, Zheng Ziwei, Xiao Xuan, Ling Chenxi, Xia Minghao, Gong Jinwei, Gao Lingya, Xiang Junwei, Hu Yue, Mei Anyi, Rong Yaoguang, Han Hongwei
Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of Education, Huazhong University of Science and Technology, Wuhan, 430074 Hubei, PR China.
J Phys Chem Lett. 2022 Mar 10;13(9):2144-2149. doi: 10.1021/acs.jpclett.2c00334. Epub 2022 Feb 28.
Perovskite solar cells (PSCs) have achieved high efficiencies with diversified device architectures. In particular, printable mesoscopic PSC has attracted intensive research attention due to its simple fabrication process and superior stability. However, in the absence of hole conductors, the unfavorable energy band alignment between the perovskite and the carbon electrode usually leads to the reduction of device performance, especially the open-circuit voltage (). Here, a p-type molecule, 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ), is utilized to post-treat the perovskite/carbon interface, which benefits the charge transfer and suppresses the charge recombination within the device. As a result, the post-treated device delivers a power conversion efficiency of 18.05% with an enhanced of 1044 mV. This work provides a facile method for tuning the interfacial energy band alignment and improving performance of printable mesoscopic PSCs.
钙钛矿太阳能电池（PSCs）通过多样化的器件结构实现了高效率。特别是，可印刷的介观PSC因其简单的制造工艺和卓越的稳定性而吸引了广泛的研究关注。然而，在没有空穴导体的情况下，钙钛矿与碳电极之间不利的能带排列通常会导致器件性能下降，尤其是开路电压（）。在此，一种p型分子2,3,5,6-四氟-7,7,8,8-四氰基对苯二醌二甲烷（F4TCNQ）被用于对钙钛矿/碳界面进行后处理，这有利于电荷转移并抑制器件内的电荷复合。结果，经过后处理的器件实现了18.05%的功率转换效率，开路电压提高到1044 mV。这项工作提供了一种简便的方法来调节界面能带排列并提高可印刷介观PSC的性能。
