High‐Performance Inverted Planar Heterojunction Perovskite Solar Cells Based on Lead Acetate Precursor with Efficiency Exceeding 18% |
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| Authors: | Lichen Zhao Deying Luo Jiang Wu Qin Hu Wei Zhang Ke Chen Tanghao Liu Yi Liu Yifei Zhang Feng Liu Thomas P. Russell Henry J. Snaith Rui Zhu Qihuang Gong |
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| Affiliation: | 1. State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Department of Physics, Peking University, Beijing, P.R. China;2. Collaborative Innovation Center of Quantum Matter, Beijing, P.R. China;3. Materials Sciences Division, Lawrence Berkeley National Laboratory, CA, USA;4. Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, UK;5. School of Chemistry, University of Lincoln, Beevor Street, Lincoln, UK;6. Department of Polymer Science and Engineering, University of Massachusetts, Amherst, MA, USA;7. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi, P.R. China |
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| Abstract: | Organic–inorganic lead halide perovskites are emerging materials for the next‐generation photovoltaics. Lead halides are the most commonly used lead precursors for perovskite active layers. Recently, lead acetate (Pb(Ac)2) has shown its superiority as the potential replacement for traditional lead halides. Here, we demonstrate a strategy to improve the efficiency for the perovskite solar cell based on lead acetate precursor. We utilized methylammonium bromide as an additive in the Pb(Ac)2 and methylammonium iodide precursor solution, resulting in uniform, compact and pinhole‐free perovskite films. We observed enhanced charge carrier extraction between the perovskite layer and charge collection layers and delivered a champion power conversion efficiency of 18.3% with a stabilized output efficiency of 17.6% at the maximum power point. The optimized devices also exhibited negligible current density–voltage (J–V) hysteresis under the scanning conditions. |
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| Keywords: | additive high efficiency inverted planar heterojunction lead acetate perovskite solar cells |
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