Spectroscopic imaging of InGaN epilayers

K. P. O'Donnell, C. Trager Cowan, S. Pereira, A. Bangura, C. Young, M. E. White, M. J. Tobin

Research output: Contribution to journalReview article

7 Citations (Scopus)

Abstract

We review several spectroscopic imaging techniques, with progressively higher spatial resolution, applied to InGaN epilayers and quantum wells (QW). The techniques discussed are: photoluminescence (PL) mapping, confocal laser scanning spectroscopy, and cathodoluminescence imaging. PL mapping (via point-by-point PL spectroscopy) is necessary when samples show macroscopic inhomogeneity. Confocal microscopy uses a diffraction-limited laser spot to address a sample in a raster scan. Here we report, for the first time, observations, on a microscopic scale, of spectroscopic fine structure in InGaN layers of moderate indium content. Cathodoluminescence (CL) imaging provides a vast amount of information on thin semiconductor layers that are well-matched to the penetration profile of electron beams of modest energies (from ≈1 to 60 keV). Panchromatic images provide useful information when compared with corresponding structural images produced by electron scattering in the sanning electron microscope (SEM). Application of image processing techniques to such images reveal striking correspondences on a size-scale below one micron.

LanguageEnglish
Pages157-161
Number of pages5
JournalPhysica Status Solidi (B) Basic Research
Volume216
Issue number1
DOIs
Publication statusPublished - 1 Jan 1999

Fingerprint

Epilayers
Cathodoluminescence
cathodoluminescence
photoluminescence
Imaging techniques
Photoluminescence
Indium
Electron scattering
Photoluminescence spectroscopy
Lasers
Confocal microscopy
imaging techniques
Semiconductor quantum wells
spectroscopy
lasers
indium
image processing
Electron beams
electron scattering
inhomogeneity

Cite this

O'Donnell, K. P. ; Trager Cowan, C. ; Pereira, S. ; Bangura, A. ; Young, C. ; White, M. E. ; Tobin, M. J. / Spectroscopic imaging of InGaN epilayers. In: Physica Status Solidi (B) Basic Research. 1999 ; Vol. 216, No. 1. pp. 157-161.
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Spectroscopic imaging of InGaN epilayers. / O'Donnell, K. P.; Trager Cowan, C.; Pereira, S.; Bangura, A.; Young, C.; White, M. E.; Tobin, M. J.

In: Physica Status Solidi (B) Basic Research, Vol. 216, No. 1, 01.01.1999, p. 157-161.

Research output: Contribution to journalReview article

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AU - O'Donnell, K. P.

AU - Trager Cowan, C.

AU - Pereira, S.

AU - Bangura, A.

AU - Young, C.

AU - White, M. E.

AU - Tobin, M. J.

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