Growth and Properties of Large Size ZnTe Crystals

Abstract

Abstract: 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 10⁴ 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.

Key words: ZnTe crystal, crystal growth, vertical Bridgman method, annealing, terahertz, nonlinear crystal, electro-optical material

CLC Number:

O782

WEI Lingli, NI Youbao, HUANG Changbao, WU Haixin, WANG Zhenyou, HU Qianqian, YU Xuezhou, LIU Guojin, ZHOU Qiang. Growth and Properties of Large Size ZnTe Crystals[J]. Journal of Synthetic Crystals, 2023, 52(7): 1317-1324.

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