Journal of Inorganic Materials ›› 2017, Vol. 32 ›› Issue (9): 980-984.doi: 10.15541/jim20160658

• Orginal Article • Previous Articles     Next Articles

Process Parameters Optimization for Cd0.9Zn0.1Te Crystal Grown by Traveling Heater Metho

Yun-Peng LING(), Jia-Hua MIN(), Xiao-Yan LIANG, Ji-Jun ZHANG, Liu-Qing YANG, Xu-Liang WEN, Ying ZHANG, Ming LI, Zhao-Xin LIU, Lin-Jun WANG, Yue SHEN   

  1. Department of Electronic Information Materials, Shanghai University, Shanghai 200444, China
  • Received:2016-11-28 Revised:2017-01-08 Online:2017-09-30 Published:2017-08-29
  • About author:LING Yun-Peng. E-mail: lypshu@163.com;1244798988@qq.com
  • Supported by:
    National Natural Science Foundation of China (11505109, 11675099, 11275122);Science and Technology Commission of Shanghai, China (11530500200, 15520500200);Innovation Program of Shanghai Municipal Education Commission, China (12ZZ096);Shanghai Leading Academic Discipline Project of Shanghai Municipal Education Commission (S30107)

Abstract:

To overcome the shortages of high growth temperature, low single crystal ratio and inhomogeneous composition of Cd0.9Zn0.1Te(CZT) crystal growth, the In-doped CZT crystal was grown by traveling heater method through optimized growth process parameters. High quality CZT crystals with diameter of 45 mm were grown after optimizing crystal growth temperature, temperature gradient at solid-liquid interface and in-situ annealing process, which had high resistivity, high transmittance, excellent uniformity, and low concentration of Te inclusions. Moreover, the patterns of wafer and powder X-ray diffraction showed that the crystallinity and the segregation of CZT were improved. Infrared transmittance spectra indicated that the level of impurities and defects was low in the crystal and the overall infrared transmittance of the crystal was about 60%. And UV-visible light absorption spectrum presented good uniformity of the crystal. Te inclusions in the crystal were observed by Infrared microscope, and it was found that Te inclusions were mainly distributed between 0-10 μm. In addition, mobility-life product for electrons of the crystal obtained was 8×10-4 cm2/V by direct current photoconductivity technique.

Key words: traveling heater method, Cd0.9Zn0.1Te, infrared transmittance, direct current photoconductivity

CLC Number: 

  • TQ174