The chalcopyrite semiconductors CuGaSe2, CuInSe2, CuGaTe2, and so forth give high efficiencies (> 10%) of solar energy conversion. The growth of CuGaTe2(s) by CVT in a closed reactor held under a temperature-gradient (Ts/Td : 988K/958K) is modelled. Gombia et al. (Journal of Crystal Growth 65:391, 1983) used these conditions to grow crystals of CuGaTe2(s). The precursor CuGaTe2(s) of the source-zone (Ts) reacts with I2(g) producing many vapor species:CuGaTe2(s) + I2(g) = (1/3)Cu3I3(g) + GaI3(g) + Te2(g) The fully-developed steady-state, three-zone (source-, middle-, deposition-) system, contains species CuI,Ga2Te,Cu3I3,GaI3,GaI,I2,I,Te2,Te,Te5,TeI,Te2I2,TeI2; the reverse of the above reaction occurs in the deposition-zone (Td) thus condensing CuGaTe2(s) crystals. The model predicts the diffusion-limited growth-rate with end-zones at virtual equilibrium. The digital computational algorithm respects the flux-constraints Cu:Ga:Te = 1:1:2. The elemental fluxes are found from molar fluxes for the species.The steady-state rates are computed for specific temperature-gradient.

Steady-state model for the chemical vapor transport growth of CuGaTe<sub>2</sub>(s) under linear temperature-gradient using iodine vapor as the transport agent

242nd National Meeting (2011)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.