ACRT技术对大尺寸ZnTe晶体溶液法制备及其性能影响

doi:10.15541/jim20220628

无机材料学报 ›› 2023, Vol. 38 ›› Issue (3): 310-315.DOI: 10.15541/jim20220628 CSTR: 32189.14.10.15541/jim20220628

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.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:2023-03-20 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. 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:2023-03-20 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/Abstract

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

中图分类号:

TN304

孙晗, 李文俊, 贾子璇, 张岩, 殷利迎, 介万奇, 徐亚东. ACRT技术对大尺寸ZnTe晶体溶液法制备及其性能影响[J]. 无机材料学报, 2023, 38(3): 310-315.

SUN Han, LI Wenjun, JIA Zixuan, ZHANG Yan, YIN Liying, JIE Wanqi, XU Yadong. Effect of ACRT Technology on the Large Size ZnTe Crystals Grown by Solution Method and Corresponding Terahertz Properties[J]. Journal of Inorganic Materials, 2023, 38(3): 310-315.

图/表 6

图1 晶体生长采用的ACRT参数

Fig. 1 ACRT parameters of ZnTe crystal growth (a) ϕ30 mm; (b) ϕ60 mm

图2 生长出的ZnTe晶锭的照片和晶片红外透过成像照片

Fig. 2 As-grown ingots and its infrared transmission imaging (a, b) Without rotation; (c, d) Bidirectional rotation

图3 不同坩埚旋转速度下溶液内部流场和浓度场分布

Fig. 3 Distributions of flow and concentration fields at different rotational speeds of crucibles (a) Without rotation; (b) Rotation at speed of 15 r/min; (c) Rotation at speed of 30 r/minColorful figure is available on website

图4 TGSG法生长ZnTe晶体时坩埚中心线上的传输现象[30]

Fig. 4 Transport phenomena along the crucible centerline during the growth of ZnTe crystal by TGSG[30] (a) Distribution of Te; (b) Distribution of the saturation and actual temperatures of the solution

图5 生长的大尺寸ZnTe晶锭照片

Fig. 5 Pictures of as-grown large size ZnTe crystal (a) Ingots; (b) Wafers after cutting; (c) Infrared transmission imaging

图6 ZnTe晶体的THz探测性能

Fig. 6 THz detection performance of ZnTe crystals (a) Detection time domain spectra; (b) Detection frequency domain spectra; (c) 3D schematic diagram of signal intensity at 0.7 THz detection from ϕ60 mm ZnTe crystal; (d) 2D schematic diagram of signal intensity at 0.7 THz detection from ϕ60 mm ZnTe crystalColorful figure is available on website

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ACRT技术对大尺寸ZnTe晶体溶液法制备及其性能影响

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

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