A Strategy to Produce High Efficiency,High Stability Perovskite Solar Cells Using Functionalized Ionic Liquid‐Dopants |
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| Authors: | Yi Zhang Zhaofu Fei Peng Gao Yonghui Lee Farzaneh Fadaei Tirani Rosario Scopelliti Yaqing Feng Paul J. Dyson Mohammad Khaja Nazeeruddin |
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| Affiliation: | 1. Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, école Polytechnique Fédérale de Lausanne, Sion, Switzerland;2. School of Chemical Engineering and Technology, Tianjin University, Tianjin, China;3. Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland |
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| Abstract: | Functionalized imidazolium iodide salts (ionic liquids) modified with ? CH2? CH?CH2, ? CH2C?CH, or ? CH2C?N groups are applied as dopants in the synthesis of CH3NH3PbI3‐type perovskites together with a fumigation step. Notably, a solar cell device prepared from the perovskite film doped with the salt containing the ? CH2? CH?CH2 side‐chain has a power conversion efficiency of 19.21%, which is the highest efficiency reported for perovskite solar cells involving a fumigation step. However, doping with the imidazolium salts with the ? CH2C?CH and ? CH2C?N groups result in perovskite layers that lead to solar cell devices with similar or lower power conversion efficiencies than the dopant‐free cell. |
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| Keywords: | fumigation ionic liquids perovskites perovskite solar cells solar cells |
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