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

doi:10.15541/jim20220628

Abstract

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

CLC Number:

TN304

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.

Figures/Tables 6

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

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

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

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

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

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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