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Wojnar P.♦, Zieliński M.♦, Janik E.♦, Zaleszczyk W.♦, Wojciechowski T.♦, Wojnar R., Szymura M.♦, Kłopotowski Ł.♦, Baczewski L.T.♦, Pietruchik A.♦, Wiater M.♦, Kret S.♦, Karczewski G.♦, Wojtowicz T.♦, Kossut J.♦, Strain-induced energy gap variation in ZnTe/ZnMgTe core/shell nanowires,
APPLIED PHYSICS LETTERS, ISSN: 0003-6951, DOI: 10.1063/1.4873355, Vol.104, pp.163111-1-5, 2014 Abstract:
Strain-induced changes of ZnTe energy gap in ZnTe/ZnMgTe core/shell nanowires arising from lattice mismatch between the core and the shell semiconductor are studied by means of optical methods. It is shown that the increase of the Mg content in the shell, as well as the increase of the shell thickness result in an effective redshift of the near band edge photoluminescence from ZnTe nanowire cores, which reflects directly the decrease of energy gap under tensile strain conditions. The conclusions are supported by theoretical calculations in terms of the valence force field model. The observed change of ZnTe energy gap can be as large as 120 meV with respect to the unstrained conditions and can be tuned in a continuous manner by adjusting shell parameters, which open a path towards an effective band gap engineering in these structures. Keywords:
Nanowires, II-VI semiconductors, Magnesium, Band gap, Quantum effects Affiliations:
| Wojnar P. | - | Institute of Physics, Polish Academy of Sciences (PL) | | Zieliński M. | - | other affiliation | | Janik E. | - | other affiliation | | Zaleszczyk W. | - | other affiliation | | Wojciechowski T. | - | Institute of Physics, Polish Academy of Sciences (PL) | | Wojnar R. | - | IPPT PAN | | Szymura M. | - | other affiliation | | Kłopotowski Ł. | - | other affiliation | | Baczewski L.T. | - | Institute of Physics, Polish Academy of Sciences (PL) | | Pietruchik A. | - | Institute of Physics, Polish Academy of Sciences (PL) | | Wiater M. | - | Institute of Physics, Polish Academy of Sciences (PL) | | Kret S. | - | Institute of Physics, Polish Academy of Sciences (PL) | | Karczewski G. | - | other affiliation | | Wojtowicz T. | - | Institute of Physics, Polish Academy of Sciences (PL) | | Kossut J. | - | Institute of Physics, Polish Academy of Sciences (PL) |
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