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Structural Properties of Nitrides Grown by OMVPE on Sapphire Substrate

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Abstract

Crystalline quality of nitrides on sapphire by OMVPE has been investigated. First, in-situ observations of the crystallization process of the low temperature deposited AIN buffer layer or GaN buffer layer on sapphire substrate have been performed. Small hexagonal mesas were formed from the sapphire to the surface and finally they formed a stacked structure. Secondly, a low temperature deposited buffer layer located between the high temperature grown GaN was found to reduce the etch pit density of GaN films. Thirdly, structural properties of Ga1−xInxN (0 ≤x≤0.21, and x= l) on GaN and GaInN/GaN MQWs on GaN have been characterized by Xray diffraction. Coherently grown GaInN showed almost the same twisting as the underlying GaN layer, while free standing InN showed large twisting. Thickness of the well layers in MQWs has been controlled within one monolayer preciseness, and the fluctuation of alloy composition has been controlled to within 2%.

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Acknowledgments

This work was partly supported by the Ministry of Education, Science, Sports and Culture of Japan, (contract nos. 06452114, 07505015, 07650025 and High-Tech Research Center Project), Japan Society For the Promotion of Science (Research for the Future Program) and DaUco Foundation.

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Amano, H., Takeuchi, T., Yamaguchi, S. et al. Structural Properties of Nitrides Grown by OMVPE on Sapphire Substrate. MRS Online Proceedings Library 482, 523–532 (1997). https://doi.org/10.1557/PROC-482-479

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