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Advanced AlGaAs/GaAs Heterostructures Grown by MOVPE
Open AccessArticle

MOVPE-Grown Quantum Cascade Laser Structures Studied by Kelvin Probe Force Microscopy

1
Semiconductor Luminescence and Injection Emitters Laboratory, Ioffe Institute, 26 Polytekhnicheskaya Str., 194021 St. Petersburg, Russia
2
Department of Physics and Engineering, ITMO University, 49 Kronverskii Ave., 197101 St. Petersburg, Russia
3
Department of Electronic and Electrical Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK
4
EPSRC National Epitaxy Facility, Department of Electronic and Electrical Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK
*
Authors to whom correspondence should be addressed.
Crystals 2020, 10(2), 129; https://doi.org/10.3390/cryst10020129
Received: 31 January 2020 / Revised: 14 February 2020 / Accepted: 17 February 2020 / Published: 20 February 2020
(This article belongs to the Special Issue MOVPE Growth of Crystalline Film)
A technique for direct study of the distribution of the applied voltage within a quantum cascade laser (QCL) has been developed. The detailed profile of the potential in the laser claddings and laser core region has been obtained by gradient scanning Kelvin probe force microscopy (KPFM) across the cleaved facets for two mid-infrared quantum cascade laser structures. An InGaAs/InAlAs quantum cascade device with InP claddings demonstrates a linear potential distribution across the laser core region with constant voltage drop across the doped claddings. By contrast, a GaAs/AlGaAs device with AlInP claddings has very uneven potential distribution with more than half of the voltage falling across the claddings and interfaces around the laser core, greatly increasing the overall voltage value necessary to achieve the lasing threshold. Thus, KPFM can be used to highlight design and fabrication flaws of QCLs. View Full-Text
Keywords: Kelvin probe force microscopy; quantum cascade laser; MOVPE Kelvin probe force microscopy; quantum cascade laser; MOVPE
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MDPI and ACS Style

Ladutenko, K.; Evtikhiev, V.; Revin, D.; Krysa, A. MOVPE-Grown Quantum Cascade Laser Structures Studied by Kelvin Probe Force Microscopy. Crystals 2020, 10, 129.

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