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Photoluminescence study of as-grown self-catalyzed GaAs/AlGaAs core-shell nanowires

Slåttnes, Patrick Rene Tollefsen
Master thesis
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566373_FULLTEXT01.pdf (5.272Mb)
566373_COVER01.pdf (184.3Kb)
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http://hdl.handle.net/11250/2370550
Utgivelsesdato
2012
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  • Institutt for elektroniske systemer [1555]
Sammendrag
A macro-photoluminescence study of self-catalyzed nanowires, using a specializedsetup for this purpose, has been performed. Several samples were even comparedto single nanowire micro-photoluminescence measurements, on the samesamples, done by other students in the nanowire group at NTNU. The macrophotoluminescence measurements were done by changing parameters such as temperature and excitation power. A 532 nm laser was used to excite the wires and thephotoluminescence was measured by a CCD detector attached to a spectroscope.Using macro-photoluminescence measurements in a qualitative comparison withmeasurements done on single nanowires by micro-photoluminescence spectroscopycan give the researcher a decent understanding of the quality of the sample and itscontributions to photoluminescence. Measurements done in this thesis show probablecontributions from most types of transitions expected in zinc-blende nanowires,consisting of such defects as dense zinc-blende/wurtzite heterostructures, highlytwinned regions, but also from nanowires of higher purity.As nanowires move closer to the realization of e.g. nanowire based solar cells,such macro-photoluminescence measurements will become increasingly importantin deciding the overall quality of the grown structures.
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