Chemical Vapour Deposition of In2O3(s): In-O-Cl System

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Professor Y. K. Rao

Single crystals of indium sesquioxide were grown by Jόzefowicz and Piekarczyk [1] in a closed quartz ampoule using Cl2(g) transport reagent. The sealed ampoule reactor was positioned in a twozone furnace with a predetermined temperature-gradient (TS → Td). The gas-phase generated by the interaction between Cl2(g) and the oxide-fines was composed of species InCl, InCl2, InCl3, In2Cl6, Cl2, Cl, ClO, In2Cl4, In2O and O2. Mass-transfer of gaseous species takes place by diffusion, Stefan flow and convection. The present work determines, by computation, the growth-rate of the In2O3-crystals ; it consists of solving the steady-state (virtual equilibrium) in the closed reactor using the equilibrium constants for the gas-solid reactions (at TS and Td), together with the element-atom-balances for Cl, In and O, the uniform total pressure and conformity with respect to the diffusion-flux constraints. The large total pressure (777.953 kPa) in the reactor results in a substantial role for the convective masstransport. It will be noted that heat treatment of the sealed ampoule reactor under a reverse temperature- gradient ahead of the normal growth-schedule appears to diminish the rate of crystal growth.

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