坩埚中自由空间量对Bridgman法生长的CdZnTe晶体缺陷的影响

doi:10.3724/SP.J.1077.2012.11548

无机材料学报 ›› 2012, Vol. 27 ›› Issue (8): 790-794.DOI: 10.3724/SP.J.1077.2012.11548 CSTR: 32189.14.SP.J.1077.2012.11548

坩埚中自由空间量对Bridgman法生长的CdZnTe晶体缺陷的影响

李辉¹, 闵嘉华¹, 王林军¹, 夏义本¹, 张继军¹, 叶邦角²

(1. 上海大学材料科学与工程学院, 上海200072; 2. 中国科学技术大学物理学院, 合肥230022)

收稿日期:2011-08-30 修回日期:2011-12-18 出版日期:2012-08-20 网络出版日期:2012-07-09
作者简介:李辉(1988-), 男, 硕士研究生. E-mail: lihuikkk@163.com
基金资助:
国家自然科学基金(10675080); 上海市重点学科基金(S30107)

Influence of Free-space Volume in Ampoule on Defects of CdZnTe Crystal Grown by Bridgman Method

LI Hui¹, MIN Jia-Hua¹, WANG Lin-Jun¹, XIA Yi-Ben¹, ZHANG Ji-Jun¹, YE Bang-Jiao²

(1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China; 2. School of Physical Sciences University of Science and Technology of China, Hefei 230022, China)

Received:2011-08-30 Revised:2011-12-18 Published:2012-08-20 Online:2012-07-09
About author:LI Hui. E-mail: lihuikkk@163.com
Supported by:
National Natural Science Foundation of China (10675080); Shanghai Leading Academic Disciplines (S30107)

摘要/Abstract

摘要： 采用Bridgman法生长CdZnTe晶体.分别采用红外透过显微镜和正电子湮灭寿命谱仪研究了CdZnTe晶体中的Te夹杂相、Cd空位等缺陷与坩埚中的自由空间量大小的关系. 结果表明: 随着坩埚自由空间量的减小, 晶体中Te夹杂相密度从6.67×10⁴/cm²降低到2.36×10³/cm², 且Te夹杂相尺寸减小; 晶体的正电子平均寿命值随着坩埚自由空间量的减小从325.4 ps降低到323.4 ps, 表明晶体的Cd空位浓度及微结构缺陷减少; 晶体的红外透过率和电阻率则随着坩埚自由空间量的减小大幅提高, 进一步表明坩埚中自由空间量的减小能够有效地降低晶体中的缺陷浓度.

关键词: CdZnTe, 缺陷, 正电子寿命, Te夹杂

Abstract: CdZnTe crystal was grown by Bridgman method. The relationship between the free-space volume in the ampoule and the defects in CZT, such as Te inclusion and Cd vacancy, was studied by IR transmission microscopy and positron annihilation technique (PAT). With the decrease of the free-space volume in the ampoule, the density reduced from 6.67×10⁴/cm² to 2.36×10³/cm² with the reduction of Te inclusions. The average positron lifetime decreased from 325.4 ps to 323.4 ps with the decrease of the free-space volume, indicating a reduction of Cd vacancies. The improvement of IR transmittance and resistivity of CZT further demonstrates that lowing the free-space volume in the ampoule can effectively depress the defects in CZT crystal.

Key words: CdZnTe, defect, PAT, Te inclusions

中图分类号:

李辉, 闵嘉华, 王林军, 夏义本, 张继军, 叶邦角. 坩埚中自由空间量对Bridgman法生长的CdZnTe晶体缺陷的影响[J]. 无机材料学报, 2012, 27(8): 790-794.

LI Hui, MIN Jia-Hua, WANG Lin-Jun, XIA Yi-Ben, ZHANG Ji-Jun, YE Bang-Jiao. Influence of Free-space Volume in Ampoule on Defects of CdZnTe Crystal Grown by Bridgman Method[J]. Journal of Inorganic Materials, 2012, 27(8): 790-794.

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坩埚中自由空间量对Bridgman法生长的CdZnTe晶体缺陷的影响

Influence of Free-space Volume in Ampoule on Defects of CdZnTe Crystal Grown by Bridgman Method

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