Abstract
This chapter presents an overview of our efforts on solution growth of large-size CdZnTe crystals for X-ray detectors. Firstly, a direct-mixing solution growth (DMSG) method is proposed in order to prepare high-purity CdZnTe crystals from 7N raw material during one single step, and the accelerated crucible rotation technique (ACRT) is used to get large-size and high-quality CdZnTe crystals. Secondly, unseeded THM process is studied to optimize the THM process. In this part, the THM furnace is firstly designed based on numerical investigation of the relationships among the ampoule diameter, the height of Te-rich solution, and the height of the heater. The thermal field stability during crystal growth is also improved by introducing a dummy crystal which has the same thermal conductivity with CdZnTe crystals. The influences of ampoule geometry and wall temperature gradient on nucleation rate as well as controlling growth interface by ampoule ration during unseeded THM are studied in order to get large crystals through unseeded THM growth. Finally, all the crystals are characterized by infrared transmission spectra, Te inclusion, composition, and I–V curve of the as-made CdZnTe detectors. A comparison between the DMSG and THM method is conducted based on numerical simulation and characterization of as-grown CdZnTe crystals, and some future research work to improve the crystal quality is discussed at the end of this chapter.
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Zhang, S., Hong, B., Zheng, L., Zhang, H., Wang, C., Zhao, B. (2022). Solution Growth of CdZnTe Crystals for X-Ray Detector. In: Iniewski, K.(. (eds) Advanced Materials for Radiation Detection. Springer, Cham. https://doi.org/10.1007/978-3-030-76461-6_13
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DOI: https://doi.org/10.1007/978-3-030-76461-6_13
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