无机材料学报 ›› 2023, Vol. 38 ›› Issue (3): 310-315.DOI: 10.15541/jim20220628

• 研究论文 • 上一篇    下一篇

ACRT技术对大尺寸ZnTe晶体溶液法制备及其性能影响

孙晗1(), 李文俊1, 贾子璇1, 张岩2, 殷利迎3, 介万奇1, 徐亚东1()   

  1. 1.西北工业大学 凝固技术国家重点实验室, 辐射探测材料与器件工信部重点实验室, 西安 710072
    2.首都师范大学 超材料与器件北京市重点实验室, 北京 100048
    3.中国电子科技集团公司 第四十六研究所, 天津 300220
  • 收稿日期:2022-10-25 修回日期:2022-12-05 出版日期:2023-01-11 网络出版日期:2023-01-11
  • 通讯作者: 徐亚东, 教授. E-mail: xyd220@nwpu.edu.cn
  • 作者简介:孙 晗(1996-), 男, 博士研究生. E-mail: sunh@mail.nwpu.edu.cn
  • 基金资助:
    国家自然科学基金(U2032170);国家自然科学基金(51872228);陕西省自然科学基金(2020JC-12);特色学科基础研究项目(G2022WD)

Effect of ACRT Technology on the Large Size ZnTe Crystals Grown by Solution Method and Corresponding Terahertz Properties

SUN Han1(), LI Wenjun1, JIA Zixuan1, ZHANG Yan2, YIN Liying3, JIE Wanqi1, XU Yadong1()   

  1. 1. Key Laboratory of Radiation Detection Materials and Devices (MIIT), State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
    2. Beijing Key Lab for Metamaterials and Devices, Capital Normal University, Beijing 100048, China
    3. No.46 Research Institute of China Electronics Technology Group Corporation, Tianjin 300220, China
  • Received:2022-10-25 Revised:2022-12-05 Published:2023-01-11 Online:2023-01-11
  • Contact: XU Yadong, professor. E-mail: xyd220@nwpu.edu.cn
  • About author:SUN Han (1996-), male, PhD candidate. E-mail: sunh@mail.nwpu.edu.cn
  • Supported by:
    National Natural Science Foundation of China(U2032170);National Natural Science Foundation of China(51872228);Natural Science Foundation of Shaanxi Province(2020JC-12);ND Basic Research Funds(G2022WD)

摘要:

太赫兹(Terahertz, THz)技术在工业无损检测、科学研究和军事领域发挥着越来越重要的作用。作为太赫兹产生和探测最常用的电光晶体材料, ZnTe晶体在生长中依然面临众多挑战。为了制备大尺寸、均匀性好、高性能的ZnTe单晶, 本研究在温度梯度溶液法生长ZnTe晶体过程中引入坩埚旋转加速技术, 制备具有高结晶质量的ZnTe晶体。模拟计算得到不同坩埚旋转速度下生长界面处对流场和溶质分布, 研究了坩埚旋转对晶体生长过程中的固液界面稳定性和晶体内Te夹杂分布的影响规律, 证明坩埚旋转加速技术可以有效地促进熔体流动, 改善溶质传质能力, 稳定溶液法晶体生长的固液界面, 不仅避免出现尾部混合相区, 也减少了ZnTe晶体内Te夹杂相的数量并减小其尺寸。通过进一步优化坩埚旋转参数, 制备出具有较高结晶质量的大尺寸ZnTe晶体(ϕ60 mm)。同时, 得益于晶体良好的均匀性, 晶体对太赫兹的高响应区域超过90%, 边缘效应小, 满足太赫兹成像要求。研究表明,引入坩埚旋转加速技术为制备大尺寸ZnTe基电光晶体提供了新的思路。

关键词: ZnTe, 坩埚旋转加速技术, 固液界面, 太赫兹探测

Abstract:

Terahertz (THz) technology has immersing potential applications in industrial non-destructive testing, scientific research and military engineering. However, as the most commonly used THz emission and detection electro-optical material, the ZnTe single crystal growth still faces great challenges. In order to achieve ZnTe single crystals with large size, good homogeneity and high performance, an accelerated crucible rotation technique (ACRT) was introduced in growing ZnTe crystals by temperature gradient solution growth method (TGSG). Intrinsic ZnTe single crystals with high crystalline quality were successfully prepared. Through the simulation of flow field and solute distribution at different rotation speeds, the influence of ACRT technology on the stability of solid-liquid interface and Te inclusions distribution in crystal growth were investigated. During the crystal growth, the ACRT technology can effectively promote the melt flow, improve the solute mass transfer ability and stabilize the solid-liquid interface, which not only avoids the appearance of mixed phase zone at the crystal tail, but also reduces the number and size of Te inclusions in the crystal. With the further optimizing parameters, a large size ZnTe single crystal with a diameter of 60 mm was prepared. Meanwhile, the high response area of terahertz exceeding 90% faces due to the great uniformity of ZnTe crystal, which meant the edge effect being significantly limited and the ZnTe crystal meeting the commercial imaging requirements. Therefore, introduction of ACRT technology can provide a new strategy for preparation of ZnTe based electro-optical crystals.

Key words: ZnTe, accelerated crucible rotation technique, solid-liquid interface, terahertz detection

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