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Centimeter-Sized Single Crystals of Two-Dimensional Hybrid Iodide Double Perovskite (4,4-Difluoropiperidinium)4AgBiI8 for High-Temperature Ferroelectricity and Efficient X-Ray Detection |
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| Authors: | Chang-Feng Wang Haojin Li Mao-Guang Li Yu Cui Xin Song Qin-Wen Wang Jia-Ying Jiang Miao-Miao Hua Qi Xu Kui Zhao Heng-Yun Ye Yi Zhang |
| Affiliation: | 1. Chaotic Matter Science Research Center, Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, 341000 P. R. China;2. Key Laboratory of Applied Surface and Colloid Chemistry, National Ministry of Education, Shaanxi Normal University, Xi'an, 710119 P. R. China Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Normal University, Xi'an, 710119 P. R. China Shaanxi Engineering Lab for Advanced Energy Technology, Shaanxi Normal University, Xi'an, 710119 P. R. China Institute for Advanced Energy Materials, Shaanxi Normal University, Xi'an, 710119 P. R. China School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119 P. R. China;3. Chaotic Matter Science Research Center, Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, 341000 P. R. China School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000 P. R. China;4. Key Laboratory of Applied Surface and Colloid Chemistry, National Ministry of Education, Shaanxi Normal University, Xi'an, 710119 P. R. China |
| Abstract: | Ferroelectricity and X-ray detection property have been recently implemented for the first time in hybrid bromide double perovskites. It sheds a light on achieving photosensitive and ferroelectric multifunctional materials based on 2D lead-free hybrid halide double perovskites. However, the low Tc, small Ps, and relatively low X-ray sensitivity in the reported bromide double perovskites hinder practical applications. Herein, the authors demonstrate a novel 2D lead-free iodide double perovskite (4,4-difluoropiperidinium)4AgBiI8 (1) for high-performance X-ray sensitive ferroelectric devices. Centimeter-sized single crystal of 1 is obtained and exhibits an excellent ferroelectricity including a high Tc up to 422 K and a large Ps of 10.5 μC cm−2. Moreover, due to a large X-ray attenuation and efficient charge carrier mobility (μ)–charge carrier lifetime (τ) product, the crystal 1 also exhibits promising X-ray response with a high sensitivity up to 188 μC·Gyair−1 cm−2 and a detection limit below 3.13 μGyair·s−1. Therefore, this finding is a step further toward practical applications of lead-free halide perovskite in high-performance photoelectronic devices. It will afford a promising platform for exploring novel photosensitive ferroelectric multifunctional materials based on lead-free double perovskites. |
| Keywords: | hybrid double perovskites lead-free perovskites molecular ferroelectrics X-ray detection |