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An analytical evaluation of GaAs grown with commercial and repurified trimethylgallium

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Abstract

An analytical study of the impurities in trimethylgallium (TMGa) and subsequent correlation of the effect of these impurities on resulting GaAs films grown by metalorganic chemical vapor deposition (MOCVD) is presented. The effects of using fractional distillation techniques to improve the quality of TMGa and to help isolate and identify major source impurities in TMGa is detailed. Photothermal ionization data are presented which show the residual donor species present and their relative concentrations in the epitaxial layers. Correlations of the residual donor concentrations with TMGa preparation are made. It is demonstrated that high purity GaAs with μ77 K ≈ 125,000 cm2/V-sec can be grown by MOCVD using repurified trimethylgallium and arsine source materials.

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Work supported in part by the U.S. Naval Research Laboratory on Contract No. N00173-80-C-0066.

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Hess, K.L., Dapkus, P.D., Manasevit, H.M. et al. An analytical evaluation of GaAs grown with commercial and repurified trimethylgallium. J. Electron. Mater. 11, 1115–1137 (1982). https://doi.org/10.1007/BF02658919

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