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Direct Measurement of Nanoscale Lateral Carrier Diffusion: Toward Scanning Diffusion Microscopy
KTH, School of Engineering Sciences (SCI), Applied Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics.ORCID iD: 0000-0002-5007-6893
KTH, School of Engineering Sciences (SCI), Applied Physics.
Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA..
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2018 (English)In: ACS PHOTONICS, ISSN 2330-4022, Vol. 5, no 2, p. 528-534Article in journal (Refereed) Published
Abstract [en]

A multimode scanning near-field optical microscopy technique that allows the mapping of surface morphology, photoluminescence (PL) spectra in illumination and illumination-collection modes, and PL dynamics, all in one scan, has been developed along with a method to use it for evaluation of carrier diffusion. The method allows measuring diffusion lengths as small as similar to 100 nm and their anisotropy and spatial distribution, parameters remaining inaccessible to conventional far-field techniques. The procedure has been applied to study ambipolar carrier diffusion in a nonpolar m-plane InGaN/GaN quantum well. The diffusion was found to be highly anisotropic with diffusion coefficients along and perpendicular to the wurtzite c axis equal to 0.4 and 1.9 cm(2)/s, respectively. The large diffusion anisotropy confirms band structure calculations that suggest that the topmost valence band in an m-plane InGaN quantum well is highly anisotropic.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2018. Vol. 5, no 2, p. 528-534
Keyword [en]
scanning near-field optical microcopy, photoluminescence, diffusion, recombination, InGaN, quantum well
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-225316DOI: 10.1021/acsphotonics.7b01061ISI: 000426142800038OAI: oai:DiVA.org:kth-225316DiVA, id: diva2:1195172
Note

QC 20180404

Available from: 2018-04-04 Created: 2018-04-04 Last updated: 2018-04-04Bibliographically approved

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Mensi, MounirIvanov, Ruslan

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Mensi, MounirIvanov, RuslanUzdavinys, Tomas Kristijonas
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