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Photoluminescence and Raman spectroscopy of wide bandgap semiconductors damaged by deep-UV laser irradiation

Journal Article · · Optical Materials Express
DOI:https://doi.org/10.1364/ome.539744· OSTI ID:2477108
 [1];  [2];  [3];  [4];  [4];  [4]
  1. Klar Scientific, Inc., Pullman, WA (United States)
  2. Klar Scientific, Inc., Pullman, WA (United States); Washington State University, Pullman, WA (United States)
  3. Washington State University, Pullman, WA (United States)
  4. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
The effects of a pulsed, focused, deep-UV (4.66 eV) laser on wide and ultra-wide bandgap semiconductors were investigated with photoluminescence (PL) and Raman spectroscopy. Three semiconductor single crystals were studied: silicon carbide (6H-SiC), gallium nitride (GaN), and gallium oxide (β-Ga2O3). Atomic emission lines from neutral Ga or Si were observed during the laser-damage process. For all three semiconductors, PL mapping (3.49 eV laser excitation) of the damaged material revealed visible emission bands in the 2.6–2.8 eV range, attributed to point defects. Raman spectra (2.33 eV excitation) showed a reduction in the Raman peak intensities in the damaged region, along with weak PL bands around 1.9–2.1 eV.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Washington State University, Pullman, WA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC52-07NA27344; FG02-07ER46386
OSTI ID:
2477108
Alternate ID(s):
OSTI ID: 2527404
OSTI ID: 2476962
Report Number(s):
LLNL--JRNL-868888
Journal Information:
Optical Materials Express, Journal Name: Optical Materials Express Journal Issue: 12 Vol. 14; ISSN 2159-3930
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English

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