卤化物
反铁电性
材料科学
钙钛矿(结构)
居里温度
磁滞
光电子学
凝聚态物理
化学
铁电性
结晶学
无机化学
物理
电介质
铁磁性
作者
Yi Liu,Yu Ma,Zhenfeng Xi,Haojie Xu,Wuqian Guo,Beibei Wang,Lina Hua,Liwei Tang,Junhua Luo,Zhihua Sun
标识
DOI:10.1038/s41467-023-38007-5
摘要
Abstract Halide double perovskites have recently emerged as an environmentally green candidate toward electronic and optoelectronic applications owing to their non-toxicity and versatile physical merits, whereas study on high-temperature antiferroelectric (AFE) with excellent anti-breakdown property remains a huge blank in this booming family. Herein, we present the first high-temperature AFE of the lead-free halide double perovskites, (CHMA) 2 CsAgBiBr 7 ( 1 , where CHMA + is cyclohexylmethylammonium), by incorporating a flexible organic spacer cation. The typical double P-E hysteresis loops and J-E curves reveal its concrete high-temperature AFE behaviors, giving large polarizations of ~4.2 μC/cm 2 and a high Curie temperature of 378 K. Such merits are on the highest level of molecular AFE materials. Particularly, the dynamic motional ordering of CHMA + cation contributes to the formation of antipolar alignment and high electric breakdown field strength up to ~205 kV/cm with fatigue endurance over 10 4 cycles, almost outperforming the vast majority of molecule counterparts. This is the first demonstration of high-temperature AFE properties in the halide double perovskites, which will promote the exploration of new “green” candidates for anti-breakdown energy storage capacitor.
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