Abstract
The inherent metallurgical problems associated with the HgTe/CdTe pseudobinary alloy system render the standard crystal growth processes inapplicable to the preparation of mercury cadmium telluride crystals for infrared detector applications. A variety of rather nonconventional techniques have been developed to overcome these problems. Two such techniques, viz. asymmetrical Bridgman and horizontal casting for solid-state recrystallization, developed at Solid State Physics Laboratory for the bulk growth of mercury cadmium telluride crystals are reviewed in this communication.
Due to the poor thermal conductivity of mercury cadmium telluride melts and solids, and the use of thick-walled quartz ampuoles, it is extremely difficult to obtain a flat solid-liquid interface during Bridgman growth of this material. The technique of asymmetrical Bridgman has been successful in overcoming this problem to a great extent. Solid-state recrystallization has been widely accepted as one of the most successful techniques for obtaining large quantities of acceptable-quality mercury cadmium telluride crystals for infrared detector applications. This is a two-step process—the melt is first quenched to obtain a good cast, which is then subjected to a grain-growth annealing. The horizontal casting procedure developed for solid state recrystallization growth has been successful in improving the overall quality and yield of bulk mercury cadmium telluride crystals.
Similar content being viewed by others
References
Bagai R K and Borle W N 1989J. Crystal Growth 94 561
Capper P, Brice J C, Jones C L, Coates W G, Gosney J J G, Ard C and Kenworthy I 1988J. Crystal Growth 89 171
Cruse P W 1981 inSemiconductors and semimetals (eds) R K Willardson and R K Beer (New York: Academic Press) Vol. 18, p. 1
Elliot C T and Gordon N T 1993 inHandbook on semiconductors (eds) T S Moss and C Hilsum (Amsterdam: North Holland) Vol. 4, p. 841
Luigi Colombo, Syllaious A J, Perlakey R W and Brau M J 1985J. Vacuum Sci. & Technol. A3 95
Micklethwaite W F H 1981 inSemiconductors and semimetals (eds) R K Willardson and R K Beer (New York: Academic Press) Vol. 18, p. 48
Micklethwaite W F H 1988J. Appl. Phys. 63 2382
Proc. SPIE Meeting 1979 San Diego, California 197
Sharma R K and Sharma B B 1987Indian J. Phys. A61 350
Sharma R K, Singh V K, Nayyar N K, Gupta S R and Sharma B B 1993J. Crystal Growth 131 565
Vere A W, Straughan B W, Williams D J, Shaw N, Royale A, Gough J S and Mullin J B 1982J. Crystal Growth 59 121
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Sharma, R.K., Bagai, R.K. & Kumar, V. Some recent advances in bulk growth of mercury cadmium telluride crystals. Bull. Mater. Sci. 18, 385–394 (1995). https://doi.org/10.1007/BF02749769
Issue Date:
DOI: https://doi.org/10.1007/BF02749769