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Title: High Internal Quantum Efficiency Ultraviolet Emission from Phase-Transition Cubic GaN Integrated on Nanopatterned Si(100)

Journal Article · · ACS Photonics
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [1]
  1. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States); Micro and Nanotechnology Technology Lab., Urbana, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Univ. of Illinois at Urbana−Champaign, Urbana, IL (United States)

Ultraviolet emission characteristics of cubic (c-) GaN enabled through hexagonal-to-cubic phase transition are reported. Substrate patterning and material growth are shown to affect phase purity and emission characteristics of c-GaN as studied by electron backscatter diffraction, and photo- and cathodoluminescence, respectively. Raman study shows a tensile strain in the c-GaN. Time-resolved photoluminescence reveals c-GaN band edge emission decay time of 11 ps. The ultraviolet emissions from both phases of GaN are linearly polarized in the same direction, which is along the < 11$$ \overline{20}\ $$ > and < 110 > directions of hexagonal GaN and c-GaN, respectively. Temperature-dependent (5.7 to 280 K) cathodoluminescence studies reveal an internal quantum efficiency of ~29% at room temperature along with intrinsic and extrinsic defect energy levels of ~124 and ~344 meV, respectively, of the phase-transition c-GaN. Using the IQE value and carrier decay lifetime, a radiative lifetime of 38 ps is extracted. Altogether, photonic properties of phase-transition c-GaN and their dependence on substrate patterning and material growth are reported.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); Univ. of Illinois – Urbana-Champaign; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1489243
Journal Information:
ACS Photonics, Vol. 5, Issue 3; ISSN 2330-4022
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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Cited By (4)

Photoluminescence Line‐Shape Analysis of Highly n‐Type Doped Zincblende GaN journal April 2020
How to control defect formation in monolithic III/V hetero-epitaxy on (100) Si? A critical review on current approaches journal August 2018
Influence of the free-electron concentration on the optical properties of zincblende GaN up to 1 × 10 20 cm 3 journal October 2019
Structural and Electronic Properties of Hexagonal and Cubic Phase AlGaInN Alloys Investigated Using First Principles Calculations journal April 2019

Figures / Tables (10)