Long Electron–Hole Diffusion Length in High‐Quality Lead‐Free Double Perovskite Films |
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| Authors: | Weihua Ning Feng Wang Bo Wu Jun Lu Zhibo Yan Xianjie Liu Youtian Tao Jun‐Ming Liu Wei Huang Mats Fahlman Lars Hultman Tze Chien Sum Feng Gao |
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| Affiliation: | 1. Department of Physics, Chemistry, and Biology (IFM), Link?ping University, Link?ping, Sweden;2. Key Lab for Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, Nanjing, P. R. China;3. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University (NTU), Singapore, Singapore;4. Laboratory of Solid State Microstructures and Innovation Center of Advanced, Microstructures, Nanjing University, Nanjing, P. R. China |
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| Abstract: | Developing environmentally friendly perovskites has become important in solving the toxicity issue of lead‐based perovskite solar cells. Here, the first double perovskite (Cs2AgBiBr6) solar cells using the planar structure are demonstrated. The prepared Cs2AgBiBr6 films are composed of high‐crystal‐quality grains with diameters equal to the film thickness, thus minimizing the grain boundary length and the carrier recombination. These high‐quality double perovskite films show long electron–hole diffusion lengths greater than 100 nm, enabling the fabrication of planar structure double perovskite solar cells. The resulting solar cells based on planar TiO2 exhibit an average power conversion efficiency over 1%. This work represents an important step forward toward the realization of environmentally friendly solar cells and also has important implications for the applications of double perovskites in other optoelectronic devices. |
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| Keywords: | double perovskite lead free long diffusion length planar solar cell |
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