In‐Plane Ferroelectricity in Thin Flakes of Van der Waals Hybrid Perovskite,Advanced Materials

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In‐Plane Ferroelectricity in Thin Flakes of Van der Waals Hybrid Perovskite
Advanced Materials ( IF 27.4 ) Pub Date : 2018-10-17 , DOI: 10.1002/adma.201803249
Lu You ₁ , Fucai Liu _{2,

3} , Hongsen Li _{1,

4} , Yuzhong Hu ₅ , Shuang Zhou _{1,

6} , Lei Chang ₁ , Yang Zhou ₁ , Qundong Fu ₃ , Guoliang Yuan ₇ , Shuai Dong ₈ , Hong Jin Fan ₅ , Alexei Gruverman ₉ , Zheng Liu ₃ , Junling Wang _{1,

10}

Affiliation

School of Materials Science and Engineering; Nanyang Technological University; Singapore 639798 Singapore
School of Optoelectronic Science and Engineering; University of Electronic Science and Technology of China; Chengdu 610054 P. R. China
Centre for Programmable Materials; School of Materials Science and Engineering; Nanyang Technological University; Singapore 639798 Singapore
School of Chemistry and Chemical Engineering; Shanghai University of Engineering Science; Shanghai 201620 P. R. China
School of Physical and Mathematical Sciences; Nanyang Technological University; Singapore 637371 Singapore
School of Science; Nanjing University of Posts and Telecommunications; Nanjing 210023 P. R. China
School of Materials Science and Engineering; Nanjing University of Science and Technology; Nanjing 210094 P. R. China
School of Physics; Southeast University; Nanjing 211189 P. R. China
Department of Physics and Astronomy; University of Nebraska-Lincoln; Nebraska 68588 USA
Academy for Advanced Interdisciplinary Studies and Department of Physics; Southern University of Science and Technology; Shenzhen 518055 P. R. China

Collective ferroic orders in van der Waals (vdW) crystals are receiving increasing attention in 2D materials research. The interplay between spatial quantum confinement and long‐range cooperative phenomena not only broadens the horizon of fundamental physics, but also enables new device paradigms and functionalities built upon vdW heterostructures. Here, the in‐plane ferroelectric properties in thin flakes of vdW hybrid perovskite bis(benzylammonium) lead tetrachloride are studied. The ordering of electric dipoles along the layer plane circumvents the depolarization field and preserves the ferroelectricity down to one unit‐cell thickness or two vdW layers at room temperature. The superior performance of the electromechanical energy conversion is demonstrated by exploiting its in‐plane piezoelectricity. The successful isolation of ferroelectric order in atomically thin vdW hybrid perovskite paves the way for nonvolatile flexible electronic devices with the cross‐coupling between strain, charge polarization, and valley degrees of freedom.

中文翻译：

范德华混合钙钛矿薄片中的平面铁电

范德华（vdW）晶体中的集体铁素体秩序在2D材料研究中受到越来越多的关注。空间量子限制与远程合作现象之间的相互作用不仅拓宽了基础物理学的视野，而且还使基于vdW异质结构的新器件范例和功能得以实现。在此，研究了vdW杂化钙钛矿双（苄基铵）四氯化铅薄片中的平面铁电性能。沿层平面排列的电偶极子绕过了去极化场，并在室温下将铁电保持低至一个单位电池厚度或两个vdW层。机电能量转换的优异性能通过利用其面内压电性得到了证明。

更新日期：2018-10-17

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