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Amide Additives Induced a Fermi Level Shift To Improve the Performance of Hole-Conductor-Free, Printable Mesoscopic Perovskite Solar Cells
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2019-10-24 , DOI: 10.1021/acs.jpclett.9b02463 Shuang Liu 1 , Sheng Li 1 , Jiawen Wu 1 , Qifei Wang 1 , Yue Ming 1 , Deyi Zhang 1 , Yusong Sheng 1 , Yue Hu 1 , Yaoguang Rong 1 , Anyi Mei 1 , Hongwei Han 1
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2019-10-24 , DOI: 10.1021/acs.jpclett.9b02463 Shuang Liu 1 , Sheng Li 1 , Jiawen Wu 1 , Qifei Wang 1 , Yue Ming 1 , Deyi Zhang 1 , Yusong Sheng 1 , Yue Hu 1 , Yaoguang Rong 1 , Anyi Mei 1 , Hongwei Han 1
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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 MAPbI3 perovskite by mixing them directly in perovskite precursor solutions. The Fermi level of MAPbI3 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-TiO2 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 (Vbi) 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.
中文翻译：
酰胺添加剂引起费米能级变化，以改善无空穴导体，可印刷的介观钙钛矿型太阳能电池的性能
过去几年中，可溶液处理的有机-无机钙钛矿太阳能电池备受关注。能级对准对于改善钙钛矿太阳能电池的性能非常重要，因为它强烈影响电荷的分离和复合。在本报告中，我们将MAPbI 3钙钛矿中的三种酰胺添加剂直接掺入钙钛矿前体溶液中，从而引入了甲酰胺，乙酰胺和尿素这三种酰胺添加剂。添加这些添加剂后，MAPbI 3的费米能级分别从-4.36 eV变为-4.63，-4.65和-4.61 eV。钙钛矿与mp-TiO 2之间的电荷转移如通过TRPL光谱所确定的，发现其被促进，并且钙钛矿中的重组被抑制。结果，基于这些钙钛矿和酰胺添加剂的可印刷的，无空穴导体的介观钙钛矿太阳能电池的内置电场（V bi）得到增强，并且峰值功率转换效率为15.57％。
更新日期：2019-10-24
中文翻译：
酰胺添加剂引起费米能级变化，以改善无空穴导体，可印刷的介观钙钛矿型太阳能电池的性能
过去几年中，可溶液处理的有机-无机钙钛矿太阳能电池备受关注。能级对准对于改善钙钛矿太阳能电池的性能非常重要，因为它强烈影响电荷的分离和复合。在本报告中，我们将MAPbI 3钙钛矿中的三种酰胺添加剂直接掺入钙钛矿前体溶液中，从而引入了甲酰胺，乙酰胺和尿素这三种酰胺添加剂。添加这些添加剂后，MAPbI 3的费米能级分别从-4.36 eV变为-4.63，-4.65和-4.61 eV。钙钛矿与mp-TiO 2之间的电荷转移如通过TRPL光谱所确定的，发现其被促进，并且钙钛矿中的重组被抑制。结果，基于这些钙钛矿和酰胺添加剂的可印刷的，无空穴导体的介观钙钛矿太阳能电池的内置电场（V bi）得到增强，并且峰值功率转换效率为15.57％。
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