Carbon Nanotube Based Inverted Flexible Perovskite Solar Cells with All‐Inorganic Charge Contacts |
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| Authors: | Qiang Luo He Ma Feng Hao Qinzhi Hou Jing Ren Lili Wu Zhibo Yao Yu Zhou Ning Wang Kaili Jiang Hong Lin Zhanhu Guo |
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| Affiliation: | 1. State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, P. R. China;2. College of Applied Sciences, Beijing University of Technology, Beijing, P. R. China;3. State Key Laboratory of Low‐Dimensional Quantum Physics, Tsinghua‐Foxconn Nanotechnology Research Center, Department of Physics, Collaborative Innovation Center of Quantum Matter, Tsinghua University, Beijing, P. R. China;4. Integrated Composites Laboratory (ICL), Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN, USA;5. State Key Laboratory of New Ceramics and Fine Processing, School of Material Science, and Engineering, Tsinghua University, Beijing, P. R. China;6. State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, P. R. China |
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| Abstract: | Organolead halide perovskite solar cells (PSC) are arising as promising candidates for next‐generation renewable energy conversion devices. Currently, inverted PSCs typically employ expensive organic semiconductor as electron transport material and thermally deposited metal as cathode (such as Ag, Au, or Al), which are incompatible with their large‐scale production. Moreover, the use of metal cathode also limits the long‐term device stability under normal operation conditions. Herein, a novel inverted PSC employs a SnO2‐coated carbon nanotube (SnO2@CSCNT) film as cathode in both rigid and flexible substrates (substrate/NiO‐perovskite/Al2O3‐perovskite/SnO2@CSCNT‐perovskite). Inverted PSCs with SnO2@CSCNT cathode exhibit considerable enhancement in photovoltaic performance in comparison with the devices without SnO2 coating owing to the significantly reduced charge recombination. As a result, a power conversion efficiency of 14.3% can be obtained on rigid substrates while the flexible ones achieve 10.5% efficiency. More importantly, SnO2@CSCNT‐based inverted PSCs exhibit significantly improved stability compared to the standard inverted devices made with silver cathode, retaining over 88% of their original efficiencies after 550 h of full light soaking or thermal stress. The results indicate that SnO2@CSCNT is a promising cathode material for long‐term device operation and pave the way toward realistic commercialization of flexible PSCs. |
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| Keywords: | carbon nanotubes charge extracting materials perovskite solar cells stabilities |
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