Investigation of material properties for zincblende AlGaN alloys applied in UV LEDs

Bo Ting Liou, Chieh I. Liu, Yen-Kuang Kuo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The material properties of zincblende AlxGa1-xN alloys from first-principles calculations are investigated. It is found that the bulk moduli of zincblende AlxGa1-xN increase with an increase of aluminum composition x, but the pressure derivative of bulk modulus decreases with an increase of aluminum composition x. The bulk modulus of 199.82 ± 0.64 GPa for GaN increases to that of 213.03 ±1.09 GPa for AlN, and the deviation parameter of bulk modulus for zincblende Al xGa1-xN is 11.18 ±3.61 GPa. The pressure derivative of bulk modulus of 4.190 ±0.020 for GaN decreases to that of 3.589 ±0.030 for AlN. The refractive indices in the wavelength range of 300-600 nm are also investigated. The one-Sellmeier-term expression is used for curve-fitting analysis of the refractive index as a function of the wavelength in the transparent region, and the results should provide for the design and growth of vertical cavity structures and distributed Bragg reflectors on GaAs substrates. Finally, the direct bowing parameter of 0.446 ± 0.126 eV and indirect bowing parameter of -0.360 ± 0.242 eV are obtained. There is a direct-indirect crossover near x = 0.654 for which the band gap energy is 4.573 eV.

Original languageEnglish
Title of host publicationSeventh International Conference on Solid State Lighting
Volume6669
DOIs
Publication statusPublished - 2007 Dec 1
Event7th International Conference on Solid State Lighting - San Diego, CA, United States
Duration: 2007 Aug 272007 Aug 29

Other

Other7th International Conference on Solid State Lighting
CountryUnited States
CitySan Diego, CA
Period07-08-2707-08-29

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Investigation of material properties for zincblende AlGaN alloys applied in UV LEDs'. Together they form a unique fingerprint.

  • Cite this

    Liou, B. T., Liu, C. I., & Kuo, Y-K. (2007). Investigation of material properties for zincblende AlGaN alloys applied in UV LEDs. In Seventh International Conference on Solid State Lighting (Vol. 6669). [66691H] https://doi.org/10.1117/12.733631