Non-synchronous bulk photovoltaic effect in two-dimensional interlayer-sliding ferroelectrics
Non-synchronous bulk photovoltaic effect in two-dimensional interlayer-sliding ferroelectrics
复制标题
二维层间滑动铁电体中的非同步体光伏效应
DOI：
10.1038/s41524-022-00828-1
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发表时间：
2022-01
影响因子：
9.7
通讯作者：
Hui Li
中科院分区：
文献类型：
--
作者：
Rui-Chun Xiao;Yang Gao;Hua Jiang;Wei Gan;Changjin Zhang;Hui Li
自发极化和体光伏效应（BPVE）是铁电材料中两个共同的物理性质。铁电序的翻转通常伴随着BPVE的切换，因为它们在逆对称下是反转的。在这项研究中，我们报道了二维（2D）层间滑动铁电材料的独特的BPVE特性，该材料具有不可切换的面内BPVE （xy平面的光诱导光电流）和可切换的面外BPVE（沿z方向的光诱导极化）。抽象双层晶体模型的对称性分析和第一性原理计算验证了BPVE的性质。这是因为层间滑动引起的正、负铁电态是由镜像对称性联系在一起的，镜像对称性不能翻转所有的BPVE张量元。这一发现扩展了对铁电性和BPVE之间关系的理解。一方面，可切换的面外BPVE可用于设计可切换的光电器件。另一方面，平面内BPVE具有抗铁电翻转的鲁棒性，且其不可切换特性有利于构建更大规模的光电器件。
Spontaneous polarization and bulk photovoltaic effect (BPVE) are two concomitant physical properties in ferroelectric materials. The flipping of ferroelectric order usually accompanies with the switching of BPVE as both of them are reversed under the inversion symmetry. In this study, we report the distinctive BPVE characters in two-dimensional (2D) interlayer sliding ferroelectric materials featuring unswitchable in-plane BPVE (light-induced photocurrent in the xy plane) and switchable out-of-plane BPVE (light-induced polarization along the z-direction). Symmetry analysis within abstract bilayer crystal model and first-principles calculations validate these BPVE properties. It is because the positive and negative ferroelectric states caused by interlayer sliding are related by mirror symmetry which cannot flip all the BPVE tensor elements. This finding extends the understanding of the relationship between ferroelectricity and BPVE. On one hand, the switchable out-of-plane BPVE can be used to design switchable photoelectric devices. On the other hand, the in-plane BPVE is robust against the ferroelectric flipping, and the unswitchable character is beneficial to construct larger-scale photoelectric devices.
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