Unsymmetrical Tellurides as Novel Metallic-Organic Chemical Vapor Deposition (MOCVD) Reagents for Tellurium Alloys

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This project is in the general area of materials chemistry and in the subfield of organometallic chemistry. The thrust of this experimental activity is the synthesis and characterization of new molecules as more efficient precursors for the fabrication of thin metal film devices by metalorganic chemical vapor deposition (MOCVD) technology. Unsymmetrical tellurides (RTeR') represent a novel alternative to the non-optimal source reagents currently in use. These unsymmetrical tellurides will have increased volatility while maintaining labile tellurium-carbon bonds by appropriate choice of the R and R' groups. The technical approach in this Phase activity is the synthesis and characterization of a series of five compounds of formula RTeR' by modifications of literature procedures. These five compounds will be pyrolized and the products identified. The relative role of carbon-based vs. tellurium-based radicals on the decomposition rate and growth temperature will be studied. Low growth temperatures are essential for the MOCVD of abrupt heterojunction devices fabricated from mercury cadmium telluride. Success in Phase I will result in the identification of new, low temperature source reagents for the MOCVD of tellurium alloys. Upon successful completion of this Phase I research, the utility of these reagents will be demonstrated in the fabrication of mercury cadmium telluride films in a subsequent Phase II effort.