University of Illinois Urbana-Champaign

Cubic III-Nitrides for photonics: Physics, materials, and devices

Lee, Jaekwon

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https://hdl.handle.net/2142/129670

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Title
Cubic III-Nitrides for photonics: Physics, materials, and devices
Author(s)
Lee, Jaekwon
Issue Date
2025-03-18
Director of Research (if dissertation) or Advisor (if thesis)
Bayram, Can
Doctoral Committee Chair(s)
Bayram, Can
Committee Member(s)
  • Dallesasse, John Michael
  • Goddard, Lynford L
  • Kim, Kyekyoon
  • Leburton, Jean-Pierre
  • Ploessl, Andreas Eberhard
  • Solgaard, Olav
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • Cubic Nitride
  • Light-emitting diodes
  • green gap
Abstract
Light-emitting diodes (LEDs), especially InGaN-based LED devices, have achieved remarkable success in solid-state lighting, contributing to 25 % of energy savings already. However, expected population growth and increasing demand for lighting necessitate a more efficient approach, which can only be realized by solving the issue of the green gap (i.e., the inefficiency of the state-of-the-art green LEDs). Cubic nitride LEDs are proposed as a promising solution to the green gap, due to well-documented advantages in the literature. However, there are theoretical and experimental issues in the current approach that need to be innovated in order to translate these material advantages into functional devices and address the green gap with the cubic nitride approach. In this thesis, the realization of cubic nitride LEDs will be tackled in both theoretical and experimental aspects. First, three crucial design rules specific to cubic nitride LEDs are suggested, enabling highly efficient theoretical stack design. Second, high-quality, phase-pure cubic GaN is demonstrated and characterized as a template for further material growth. Next, purely cubic active layers are synthesized and characterized, showing high enough internal quantum efficiency with green emission to make a functional device. Finally, the LED and micro-LED fabrication based on cubic GaN template are shown, and the characterization of these novel devices is discussed.
Graduation Semester
2025-05
Type of Resource
Thesis
Handle URL
https://hdl.handle.net/2142/129670
Copyright and License Information
Copyright 2025 Jaekwon Lee

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