Reducing Defects Density and Enhancing Hole Extraction for Efficient Perovskite Solar Cells Enabled by π‐Pb 2+ Interactions
| Autor: | Li-Rong Wen, Zhongmin Zhou, Jingbo Zhan, Lin-Bao Zhang, Rui-Tao Li, Mingzhe Zhu, Ming Li, Yi Rao, Li Wang, Shuping Pang |
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| Rok vydání: | 2021 |
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| Zdroj: | Angewandte Chemie. 133:17496-17501 |
| ISSN: | 1521-3757 0044-8249 |
| DOI: | 10.1002/ange.202102096 |
| Popis: | Molecular doping is an of significance approach to reduce defects density of perovskite and to improve interfacial charge extraction in perovskite solar cells. Here, we show a new strategy for chemical doping of perovskite via an organic small molecule, which features a fused tricyclic core, showing strong intermolecular π-Pb 2+ interactions with under-coordinated Pb 2+ in perovskite. This π-Pb 2+ interactions could reduce defects density of the perovskite and suppress the nonradiative recombination, which was also confirmed by the density functional theory calculations. In addition, this doping via π-Pb 2+ interactions could deepen the surface potential and downshift the work function of the doped perovskite film, facilitating the hole extraction to hole transport layer. As a result, the doped device showed excellent efficiency of 21.41% with ignorable hysteresis. This strategy of fused tricyclic core-based doping provides a new perspective for the design of new organic materials to improve the device performance. |
| Databáze: | OpenAIRE |
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