Water-Assisted Growth of Bi_(2)Te_(3)-Sb_(2)Te_(3)Lateral Heterostructures for Enhanced Second Harmonic Generation  

水辅助生长增强二次谐波产生的Bi2Te3-Sb2Te3横向异质结构

作　　者：Xinfeng Wang Han Wang Yiran Wu Yulong Lian Jinyang Liu Sangen Zhao 汪鑫峰;汪韩;巫逸然;连宇龙;刘金养;赵三根(福建师范大学物理与能源学院,福州350117;福建师范大学化学与材料科学学院,福州350117;福建省量子调控与新能源材料重点实验室,福州350117;福建省太阳能转换与储能工程技术研究中心,福州350117;中国科学院福建物质结构研究所结构化学国家重点实验室,福州350002)

机构地区：[1]College of Physics and Energy,Fujian Normal University,Fuzhou 350117,China [2]College of Chemistry and Materials Science,Fujian Normal University,Fuzhou 350117,China [3]Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials,Fuzhou 350117,China [4]Fujian Provincial Engineering Technology Research Center of Solar Energy Conversion and Energy Storage,Fuzhou 350117,China [5]State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China

出　　处：《Chinese Journal of Chemical Physics》2025年第2期240-248,I0035-I0038,I0041,共14页化学物理学报(英文)

基　　金：supported by the Natural Science Foundation of Fujian Province of China(2022J01646)。

摘　　要：The heterostructures incorporated with two or more distinctive two-dimensional(2D)materials have attracted great attention be-cause they could give rise to enhanced prop-erty in comparison with their individual counterparts.Here,a water-assisted two-step rapid physical vapor deposition(rPVD)method was explored and used to synthesize Bi_(2)Te_(3)-Sb_(2)Te_(3)lateral het-erostructures(LHS)successfully.The Bi_(2)Te_(3)-Sb_(2)Te_(3)LHS is in nearly uniform size,and grows along three particular orientations with the intersection angles of 120°.Inter-estingly,we found that the water molecules play a significant role in determining the growth orientation,namely whether it will grow along the vertical or lateral direction in 2D structure.Hence,a growth mechanism of LHS based on the water-assisted two-step rPVD was present,which can be used as a general strategy and extended to the growth of other 2D heterostruc-tures or homostructures,such as SnS-SnSe LHS and SnS-SnS lateral homostructures.Fur-thermore,the second-harmonic generation intensity of the Bi_(2)Te_(3)-Sb_(2)Te_(3)LHS is much stronger than that of the Bi_(2)Te_(3)/Sb_(2)Te_(3)vertical heterostructures(VHS).This work opens a new approach for the synthesis of water-assisted lateral 2D heterostructures or homostruc-tures and offers a new method to enhance the second-harmonic generation properties of topo-logical insulating materials.由于异质结构由两种或多种不同二维材料相结合而产生,其相较于单一材料可提升性能,引起了人们的极大关注.本文发展了一种水辅助两步快速物理气相沉积法,成功地合成了Bi2Te3-Sb2Te3横向异质结构.Bi2Te3-Sb2Te3横向异质结构的尺寸均匀,沿三个特定的方向生长,且各方向之间的夹角为120°.研究发现水分子在生长方向上起着决定性的作用,即在二维结构生长过程中是沿垂直方向生长还是横向方向生长.基于此,以水辅助两步快速物理气相沉积法为基础,本文提出了横向生长的普遍策略,并将该方法扩展到其他二维异质结构或同质结构的生长中,如SnS-SnSe横向异质结构和SnS-SnS横向同质结构.此外,Bi2Te3-Sb2Te3横向异质结构所产生的二次谐波强度远高于Bi2Te3/Sb2Te3垂直异质结构.本研究为通过水辅助的方法合成横向二维异质结构或同质结构开辟了一种新思路,同时也为提高拓扑绝缘材料的二次谐波性能提供了一种新方法.

关 键 词：Water-assisted growth Lateral heterostructure Topological insulator Second harmonic generation 

分 类 号：O469[理学—凝聚态物理]