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Structural and Electronic Properties of Hexagonal and Cubic Phase AlGaInN Alloys Investigated Using First Principles
1Department of Electrical and Computer Engineering, University of Illinois at Urbana, Champaign, Illinois, 61801, USA.
Cubic AlGaInN alloys exhibit superior properties over hexagonal phases, featuring smaller bandgaps and effective masses. These characteristics make cubic AlGaInN alloys promising for advanced light-emitting and laser diodes.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Computational Materials Science
Background:
- AlGaInN alloys are crucial in optoelectronic devices.
- Understanding phase-dependent properties is key for material optimization.
Purpose of the Study:
- Investigate structural and electronic properties of hexagonal (h-) and cubic (c-) phase AlGaInN alloys.
- Compare material advantages of c-phase over h-phase AlGaInN for device applications.
Main Methods:
- Utilized a local-density approximation-1/2 approach within density-functional theory.
- Employed virtual crystal approximation for effective mass calculations.
Main Results:
- Calculated lattice and bandgap bowing parameters for various AlGaInN compositions and phases.
- Determined direct-to-indirect bandgap crossover points for c-phase AlGaN and AlInN.
- Observed smaller electron effective masses in c-phase AlGaInN compared to h-phase.
Conclusions:
- Cubic AlGaInN alloys possess advantageous material properties, including smaller bandgaps and effective masses.
- These properties suggest significant potential for c-phase AlGaInN in light-emitting and laser diodes.
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