大尺寸ZnTe晶体的生长与性能  

Growth and Properties of Large Size ZnTe Crystals

作　　者：魏玲莉 倪友保[1] 黄昌保[1] 吴海信[1] 王振友[1] 胡倩倩 余学舟 刘国晋 周强 WEI Lingli;NI Youbao;HUANG Changbao;WU Haixin;WANG Zhenyou;HU Qianqian;YU Xuezhou;LIU Guojin;ZHOU Qiang(Anhui Provincial Key Laboratory of Photonic Devices and Material,Anhui Institute of Optics and Fine Mechanics,Hefei Institute of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院合肥物质科学研究院,安徽光学精密机械研究所,安徽省光子器件与材料重点实验室,合肥230031 [2]中国科学技术大学,合肥230026

出　　处：《人工晶体学报》2023年第7期1317-1324,共8页Journal of Synthetic Crystals

基　　金：国家重点研发计划(2021YFB3601503)。

摘　　要：碲化锌(ZnTe)非线性晶体是一种常用的产生和探测太赫兹(THz)波的电光材料,在THz探测和成像等领域具有重要的应用价值。然而,目前制备高质量、大尺寸的ZnTe晶体仍然面临挑战。本文采用压力辅助的垂直布里奇曼法,成功生长出尺寸为∅40 mm×140 mm的完整ZnTe单晶棒,并对其晶体结构、结晶质量、光学与电学性能进行了表征和分析。针对Te夹杂相对晶体性能的影响,初步探索了ZnTe晶体的退火工艺。研究结果表明,在850℃、Zn气氛下退火200 h,晶体在可见-近红外波段(400~2500 nm)的透过率达到62%,电阻率为10^(4)Ω·cm,在0.2~2 THz的吸收系数为5~15 cm^(-1)。测试及分析结果为实现高质量ZnTe晶体的制备提供了参考。Zinc telluride(ZnTe)nonlinear crystal,a commonly used electro-optical material,can be used to generate and detect Terahertz(THz)wave,and has been widely used in the fields of THz wave detection and imaging.However,the preparation of ZnTe crystal with high quality and large size still remains a challenge.In this paper,ZnTe single crystal rod with diameter of 40 mm and length of 140 mm was successfully prepared by the pressure assisted vertical Bridgman method.The crystal structure,crystalline quality,optical and electrical properties of ZnTe crystal were characterized and analyzed.The effects of annealing process of ZnTe crystal on the crystal's properties related to Te inclusions were investigated.According to the research results,after annealed at 850℃for 200 h under Zn atmosphere,the transmittance of the crystal in the visible-near infrared wave band reaches up to 62%,the resistivity of the crystal is 10^(4)Ω·cm,and the absorption coefficient is from 5 cm^(-1) to 15 cm^(-1) at the range from 0.2 THz to 2 THz.The results provide a valuable reference for the preparation of high-quality ZnTe crystal.

关 键 词：ZnTe晶体 晶体生长 垂直布里奇曼法 退火 太赫兹 非线性晶体 电光材料 

分 类 号：O782[理学—晶体学]