Liu Shuang, Li Sheng, Wu Jiawen, Wang Qifei, Ming Yue, Zhang Deyi, Sheng Yusong, Hu Yue, Rong Yaoguang, Mei Anyi, Han Hongwei
Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information , Huazhong University of Science and Technology , Wuhan 430074 , Hubei , P. R. China.
J Phys Chem Lett. 2019 Nov 7;10(21):6865-6872. doi: 10.1021/acs.jpclett.9b02463. Epub 2019 Oct 24.
Solution-processable organic-inorganic perovskite solar cells have attracted much attention in the past few years. Energy level alignment is of great importance for improving the performance of perovskite solar cells because it strongly influences charge separation and recombination. In this report, we introduce three amide additives, namely, formamide, acetamide, and urea, into the MAPbI perovskite by mixing them directly in perovskite precursor solutions. The Fermi level of MAPbI shifts from -4.36 eV to -4.63, -4.65, and -4.61 eV, respectively, upon addition of these additives. The charge transfer between perovskite and mp-TiO is found to be promoted as determined via TRPL spectra, and recombination in the perovskite is suppressed. As a result, the built-in electric field () of the printable, hole-conductor-free mesoscopic perovskite solar cells based on these perovskites with amide additives is enhanced and a peak power conversion efficiency of 15.57% is obtained.
在过去几年中，溶液可加工的有机-无机钙钛矿太阳能电池备受关注。能级排列对于提高钙钛矿太阳能电池的性能至关重要，因为它会强烈影响电荷分离和复合。在本报告中，我们通过将三种酰胺添加剂，即甲酰胺、乙酰胺和尿素，直接混合到钙钛矿前驱体溶液中，引入到MAPbI钙钛矿中。添加这些添加剂后，MAPbI的费米能级分别从-4.36 eV 变为-4.63、-4.65 和-4.61 eV。通过TRPL光谱确定，发现钙钛矿与mp-TiO之间的电荷转移得到促进，并且钙钛矿中的复合受到抑制。结果，基于这些含酰胺添加剂的钙钛矿的可印刷、无空穴导体介观钙钛矿太阳能电池的内建电场增强，获得了15.57%的峰值功率转换效率。
