材料科学
居里温度
化学气相沉积
铁电性
纳米片
极化(电化学)
纳米技术
凝聚态物理
光电子学
电介质
铁磁性
物理化学
物理
化学
作者
Ping Wang,Jing Wang,Rui Na,Weikang Dong,Jing‐Yi Duan,Yue Cheng,Baoqiang Xu,Denan Kong,Jijian Liu,Shuang Du,Chunyu Zhao,Yang Yang,Lu Lv,Qingmei Hu,Hui Ai,Yufeng Xiong,V. S. Stolyarov,Shoujun Zheng,Yao Zhou,Xubiao Luo,Jiadong Zhou
标识
DOI:10.1002/adma.202400655
摘要
Abstract Ultrathin 2D ferroelectrics with high Curie temperature are critical for multifunctional ferroelectric devices. However, the ferroelectric spontaneous polarization is consistently broken by the strong thermal fluctuations at high temperature, resulting in the rare discovery of high‐temperature ferroelectricity in 2D materials. Here, a chemical vapor deposition method is reported to synthesize 2D CuCrSe 2 nanosheets. The crystal structure is confirmed by scanning transmission electron microscopy characterization. The measured ferroelectric phase transition temperature of ultrathin CuCrSe 2 is about ≈800 K. Significantly, the switchable ferroelectric polarization is observed in ≈5.2 nm nanosheet. Moreover, the in‐plane and out‐of‐plane ferroelectric response are modulated by different maximum bias voltage. This work provides a new insight into the construction of 2D ferroelectrics with high Curie temperature.
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