ScienceDirect - Journal of Crystal Growth : Low supersaturation nucleation and "contactless" growth of photorefractive ZnTe crystals

K. Grasza^a^,^,^,¹, S. B. Trivedi^a, Zengchen Yu^a, S. W. Kutcher^a, W. Palosz^b and G. A. Brost^c

^a Brimrose Corporation of America, 5020 Campbell Blvd., Baltimore, Maryland 21236-4968, USA
^b Space Science Laboratory, (USRA) NASA/Marshall Space Flight Center, Huntsville, Alabama 35812, USA
^c Rome Laboratory, 25 Electronic Parkway, Rome, New York 13441, USA

Available online 13 May 1998.

Abstract

New photorefractive ZnTe crystals have been successfully grown by methods previously applied only for the growth of CdTe single crystals [K. Grasza, J. Crystal Growth 146 (1995) 65]. The main feature of this method lies in the novel procedure of self-seeding in conditions of permanently low supersaturation, growth with no contact between the crystal and ampoule wall, self-purification and improvement of stoichiometry of the source material during growth. Additionally, a new procedure of lowering the optimal growth temperature was applied and an optimal growth rate with stable growth conditions was investigated. The ZnTe crystals had resistivity exceeding 10⁸ capital Omega, Greek · cm. Photorefractive characterization was performed using the two-beam mixing technique, and the photorefractive gain in the range 0.63–1.5 small mu, Greek m was measured.

Author Keywords: Crystal growth from the vapor; Lowsupersaturation nucleation; ZnTe; Photorefractive materials; Doping by transition metals

PACS classification codes: 81.05.Dz; 81.10.Bk; 61.72.Vv; 42.70.Nq

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