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Effect of biaxial strain on the band gap of wurtzite Al x Ga1−x N

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Abstract

First-principles calculations are applied to investigate the effect of biaxial strain on the band gap of wurtzite Al x Ga1−x N. The band gap and band gap bowing parameter increase with compressive strain and decrease with tensile strain. The strain-induced changes in the band gap of Al x Ga1−x N are linear in the strain range of about −1% to 1% while the linearity is invalid out of the range. The linear coefficient B(x), characterizing the relationship between the band gap and the biaxial stress, with a quadratic form is obtained. The value of the band gap bowing parameter decreases from 1.0 eV for −2% strain to 0.91 eV for unstrained and to 0.67 eV for 2% strain.

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Acknowledgements

This work is supported by the National Science Council of Taiwan under grant NSC 98-2112-M-164-002-MY3.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Hsiuping University of Science and Technology, Taichung, 41280, Taiwan

    Bo-Ting Liou

  2. Department of Physics, National Changhua University of Education, Changhua, 50058, Taiwan

    Yen-Kuang Kuo

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  1. Bo-Ting Liou
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Correspondence to Bo-Ting Liou.

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Liou, BT., Kuo, YK. Effect of biaxial strain on the band gap of wurtzite Al x Ga1−x N. Appl. Phys. A 106, 1013–1016 (2012). https://doi.org/10.1007/s00339-012-6772-2

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  • DOI: https://doi.org/10.1007/s00339-012-6772-2

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