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MULTIMODE SCANNING NEAR-FIELD PHOTOLUMINESCENCE SPECTROSCOPY AND ITS APPLICATION FOR STUDIES OF InGaN EPITAXIAL LAYERS AND QUANTUM WELLS
KTH, School of Engineering Sciences (SCI), Applied Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics.
2018 (English)In: Lithuanian Journal of Physics, ISSN 1648-8504, Vol. 58, no 1, p. 76-89Article in journal (Refereed) Published
Abstract [en]

The paper reviews our recent achievements in developing a multimode scanning near-field optical microscopy (SNOM) technique. The multimode SNOM apparatus allows us to simultaneously measure spatial variations of photoluminescence spectra in the illumination and illumination-collection modes, their transients and sample surface morphology. The potential of this technique has been demonstrated on a polar InGaN epitaxial layer and nonpolar InGaN/GaN quantum wells. SNOM measurements have allowed revealing a number of phenomena, such as the band potential fluctuations and their correlation to the surface morphology, spatial nonuniformity of the radiative and nonradiative lifetimes, as well as the extended band nature of localized states. The combination of different modes enabled measurements of the ambipolar carrier diffusion and its anisotropy.

Place, publisher, year, edition, pages
LITHUANIAN PHYSICAL SOC , 2018. Vol. 58, no 1, p. 76-89
Keyword [en]
near-field, SNOM, photoluminescence, InGaN, diffusion, recombination
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-227790DOI: 10.3952/physics.v58i1.3653ISI: 000431070400008Scopus ID: 2-s2.0-85045338486OAI: oai:DiVA.org:kth-227790DiVA, id: diva2:1205318
Funder
Swedish Energy Agency, 45390-1Swedish Research Council
Note

QC 20180514

Available from: 2018-05-14 Created: 2018-05-14 Last updated: 2018-05-14Bibliographically approved

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