Intrinsic ultrahigh negative Poisson’s ratio in two-dimensional ferroelectric ABP 2 x 6 materials

Abstract:
Recently, ferroelectric materials have attracted considerable research attention. In particular, two dimensional (2D) ferroelectric materials have been considered as most crucial for nextgeneration circuit designs because of their application as novel electric memory devices. However, a 2D ferroelectric material is very rare. The ferroelectric materials with the form ABP2X6 (A = Ag, Cu; B = Bi, In; X = S, Se) are of interest because of their ferroelectric property maintained in their ultrathin structures. Within the ABP2X6 monolayer, the P—P bonds form the pillars that hold the top and bottom X planes, while the off-center A—B atoms between the X layers induce a spontaneous ferroelectric polarization. If the two off-center A—B sites are equally aligned, this would lead to the appearance of the paraelectric state. Such intriguing structures must impart novel mechanical properties to the materials. Until now, there has been no report on the mechanical properties of monolayer ABP2X6. Based on first-principles calculations, we studied the structural, electronic, mechanical as well as the electromechanical coupling properties of monolayer ABP2X6 (A = Ag, Cu; B = Bi, In; X = S, Se). We found that they are all semiconductors with wide bandgaps of 2.73, 2.17, 3.00, and 2.31 eV for CuInP2Se6, CuBiP2Se6, AgBiP2Se6, and AgBiP2Se6, respectively, which are calculated based on the Heyd-Scuseria-Ernzerhof (HSE) exchange correlation functional model. The conduction band minimum is mainly from p orbitals of X and B atoms, whereas the valence band maximum is due to the hybridization of the p orbital of X atoms and the d orbital of A atoms. Moreover, there are three short and three long A/B—X bonds due to the A—B offcenter displacement. Together with the d-p orbital hybridization, the main reason for the distorted ferroelectric structure in ABP2X6 monolayers is the Jahn-Teller effect. ABP2X6 monolayers are predicted to be a new class of auxetic materials with an out-of-plane negative Poisson’s ratio, i.e., the values of the negative Poisson’s ratio are in the order AgBiP2S6 (−0.805) < AgBiP2Se6 (−0.778) < CuBiP2Se6 (−0.670) < CuInP2S6 (−0.060). This is mainly due to the tensile strain applied in the x/y direction enlarging the angle between P—P bonds and top layer X atoms, thereby enhancing the bucking height of monolayer ABP2X6. Moreover, external strain has a significant impact on the A—B off-center displacement, rendering an out-of-plane piezoelectric polarization. The values of e13 for CuInP2S6, CuBiP2Se6, AgBiP2Se6, AgBiP2Se6 monolayers are calculated to be −3.95 × 10−12, −5.68 × 10−12, −3.94 × 10−12, −2.71 × 10−12 C.m−1, respectively, which are comparable to the only experimentally confirmed 2D out-of-plane piezoelectric Janus system (piezoelectric coefficient = −3.8 × 10−12 C.m−1). This unusual auxetic behavior, ferroelectric polarization, and the electromechanical coupling in monolayer ABP2X6 could potentially lead to enormous technologically important applications in nanoelectronics, nanomechanics, and piezoelectrics.
Author Listing: Chunmei Zhang;Yihan Nie;Aijun Du
Volume: 35
Pages: 1128-1133
DOI: 10.3866/PKU.WHXB201812037
Language: English
Journal: Acta Physico-chimica Sinica

ACTA PHYSICO-CHIMICA SINICA

ACTA PHYS-CHIM SIN

影响因子:10.8 是否综述期刊:否 是否OA:否 是否预警:不在预警名单内 发行时间:1985 ISSN:1000-6818 发刊频率:Irregular 收录数据库:SCIE/Scopus收录 出版国家/地区:PEOPLES R CHINA 出版社:Beijing University Press

期刊介绍

Acta Physico-Chimica Sinica, founded in 1985, is sponsored by the Chinese Chemical Society and organized by the College of Chemistry and Molecular Engineering, Peking University. Acta Physico-Chimica Sinica is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and material physical chemists.

《物理化学学报》创刊于1985年,由中国化学学会主办,北京大学化学与分子工程学院承办。物理化学学报致力于报道物理化学家、生物物理化学家和材料物理化学家感兴趣的新颖的实验和理论基础研究。

年发文量 112
国人发稿量 112
国人发文占比 100%
自引率 8.3%
平均录取率 容易
平均审稿周期 平均1.2个月
版面费 -
偏重研究方向 化学-物理化学
期刊官网 http://www.whxb.pku.edu.cn/CN/1000-6818/home.shtml
投稿链接 http://www.whxb.pku.edu.cn/journalx_wlhx/authorLogOn.action

质量指标占比

研究类文章占比 OA被引用占比 撤稿占比 出版后修正文章占比
62.50% 0.00% 0.00% 0.00%

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