Numerical Simulations and Experimental Investigations on Lead Iodide Single Crystals Growth

Abstract:

Lead iodide (PbI₂) single crystal for room temperature radiation detectors are mainly produced by Vertical Bridgman (VB) method. Computer simulations of the VB method could be an effective tool to optimize the growth process and reduce the production costs. In the present study, we applied the general Computational Fluid Dynamics (CFD) code to solute the quasi-static two-dimensional (2D) axisymmetric model of the VB ampoule filled with PbI₂ melt and direct the growth of high quality PbI₂ single crystals with a diameter of 15 mm. The thermal conductivity and latent heat generation during the crystallization is considered in the numerical model. We focused on the crystal-melt interface deflection. The results demonstrated that the ampoule with 15 mm diameter is better than that of 30 mm. The experimental results showed that the single crystal with 15 mm diameter exhibited high electrical resistivity (10⁹ Ωcm).

• Periodical: Materials Science Forum (Volume 873)
• Pages: 58-62
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.873.58
• Online since: September 2016
• Authors: Jing Liu*, Yu Zhang
• Keywords: Numerical Simulation, PbI₂, Single Crystal

References

[1] Zhang J, Song T, Zhang Z, et al. Layered ultrathin PbI2 single crystals for high sensitivity flexible photodetectors [J]. Journal of Materials Chemistry C, 2015, 3: 4402.

DOI: 10.1039/c4tc02712d

[2] Zhu X H, Wei Z R, Jin Y R, et al. Growth and characterization of a PbI2 single crystal used for gamma ray detectors [J]. Crystal Research Technology, 2007, 42: 456.

DOI: 10.1002/crat.200610847

[3] Liu W, Liu Y, Chen L, et al. Gel-incorporated PbS and PbI2 single-crystals [J]. Chinese Chemical Letter, 2015, 26: 504.

DOI: 10.1016/j.cclet.2015.01.020

[4] Zhao X. Research development of PbI2 single crystal growth and room-temperature nuclear radiation detectors [J]. Materials Review, 2011, 25(1): 80.

[5] Olilveira I B, Costa F E, Armelin M J, et al. Purification and growth of PbI2 crystals: Dependence of the radiation response on the PbI2 crystal purity [J]. IEEE Transactions Nuclear Science, 2002, 49: (1968).

DOI: 10.1109/tns.2002.801483

[6] Shoji T, Hitomi K, Tiba T, et al. Fabrication of radiation detectors using PbI2 crystal and its response characteristics for gamma-rays [J]. IEEE Transactions Nuclear Science, 1998, 34: 581.

DOI: 10.1109/23.682452

[7] Hayashi T, Kinpara M, Wang J F, et al. Growth of PbI2 single crystals from stoichiometric and Pb excess melts [J]. Journal of Crystal Growth, 2008, 310: 47.

DOI: 10.1016/j.jcrysgro.2007.10.004

[8] He Y, Zhu S F, Zhao B J, et al. Improved growth of PbI2 single crystals [J]. Journal of Crystal Growth, 2007, 300: 448.

DOI: 10.1016/j.jcrysgro.2006.10.226

[9] Jin CH. Numerical study of heat transport and fluid flow during the silicon crystal growth process by the Czochralski method [J]. Journal of semiconductors, 2013, 34 (6): 063005.

DOI: 10.1088/1674-4926/34/6/063005

[10] Sipowska JT, McBride JJ, Westrum EF. Heat capacity and thermodynamic properties of anisotropic crystals: PbI2, ZnCl2, and AsI3 at temperatures from 5 K to 350 K. Journal of chemical thermodynamics, 1998, 30: 1333-1345.

DOI: 10.1006/jcht.1998.0403