Aligned and Graded Type‐II Ruddlesden–Popper Perovskite Films for Efficient Solar Cells |
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| Authors: | Jian Qing Xiao‐Ke Liu Mingjie Li Feng Liu Zhongcheng Yuan Elizaveta Tiukalova Zhibo Yan Martial Duchamp Shi Chen Yuming Wang Sai Bai Jun‐Ming Liu Henry J Snaith Chun‐Sing Lee Tze Chien Sum Feng Gao |
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| Affiliation: | 1. Center of Super‐Diamond and Advanced Films (COSDAF) and Department of Chemistry, City University of Hong Kong, Hong Kong SAR, P. R. China;2. Department of Physics, Chemistry and Biology (IFM), Link?ping University, Link?ping, Sweden;3. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore;4. Department of Physics and Astronomy, and Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai, P. R. China;5. School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore;6. Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, P. R. China;7. Institute of Material Research and Engineering, A*‐STAR, Singapore, Singapore;8. Department of Physics, Clarendon Laboratory, University of Oxford, Oxford, UK |
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| Abstract: | Recently, Ruddlesden–Popper perovskites (RPPs) have attracted increasing interests due to their promising stability. However, the efficiency of solar cells based on RPPs is much lower than that based on 3D perovskites, mainly attributed to their poor charge transport. Herein, a simple yet universal method for controlling the quality of RPP films by a synergistic effect of two additives in the precursor solution is presented. RPP films achieved by this method show (a) high quality with uniform morphology, enhanced crystallinity, and reduced density of sub‐bandgap states, (b) vertically oriented perovskite frameworks that facilitate efficient charge transport, and (c) type‐II band alignment that favors self‐driven charge separation. Consequently, a hysteresis‐free RPP solar cell with a power conversion efficiency exceeding 12%, which is much higher than that of the control device (1.5%), is achieved. The findings will spur new developments in the fabrication of high‐quality, aligned, and graded RPP films essential for realizing efficient and stable perovskite solar cells. |
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| Keywords: | 2D additives charge separation layered perovskite solar cells |
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