Rationally Induced Interfacial Dipole in Planar Heterojunction Perovskite Solar Cells for Reduced J–V Hysteresis |
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Authors: | Zonghao Liu Qi Chen Jin‐Wook Lee Zhixin Zhao Xiaobao Xu Yao‐Tsung Hsieh Lei Meng Pengyu Sun Nicholas De Marco Huanping Zhou Yi‐Bing Cheng Yang Yang |
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Institution: | 1. Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei, P. R. China;2. Department of Materials Science and Engineering, University of California, Los Angeles, CA, USA;3. Department of Materials Science and Engineering, Beijing Institute of Technology, Beijing, P. R. China;4. Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, P. R. China;5. Department of Materials Engineering, Monash University, Victoria, Australia |
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Abstract: | With the rapid progress in developing hybrid perovskite solar cells, the allure of current density–voltage ( J–V) hysteresis has attracted quite a lot of interest in the research community. It requires feasible approaches that further deepen the fundamental understanding of device physics in specific device architecture in order to solve this problem eventually. Here, perovskite solar cells configured with different counter electrodes are systematically investigated with the focus on charge accumulation within the devices responsible for J–V hysteresis. The results indicate that J–V hysteresis is affected by charge accumulation which can be modulated by carrier extraction efficiency of the electrodes. Through a rationally induced interfacial dipole, the devices have shown improvement in carrier extraction, which thus reduces J–V hysteresis significantly. It provides solid evidence for the proposition that interface charge plays an important role in J–V hysteresis, and demonstrates an applicable strategy that effectively alleviates J–V hysteresis in perovskite solar cells. |
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Keywords: | dipoles hysteresis interfaces perovskites solar cells |
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