TITLE

Observation of free exciton photoluminescence emission from single wurtzite GaAs nanowires

AUTHOR(S)
Hoang, Thang B.; Moses, A. F.; Zhou, H. L.; Dheeraj, D. L.; Fimland, B. O.; Weman, H.
PUB. DATE
March 2009
SOURCE
Applied Physics Letters;3/30/2009, Vol. 94 Issue 13, p133105
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Microphotoluminescence measurements are used to investigate the optical properties of single wurtzite GaAs nanowires grown by molecular beam epitaxy. The wurtzite GaAs nanowires exhibit a photoluminescence emission peak at 1.544 eV, 29 meV higher than the zinc blende GaAs free exciton energy. Temperature dependent photoluminescence measurements (4.4–70 K) show indications of defect and impurity related emissions at lower energies (1.53–1.54 eV) and the presence of nonradiative defects. High resolution transmission electron microscopy images show a low density of short zinc blende segments sandwiched in between a dominating wurtzite structure and weak photoluminescence emission related to such zinc blende segments is also observed.
ACCESSION #
37321909

 

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