共 36 条
Transition in the Optical Emission Polarization of ZnO Nanorods
被引:53
作者:
Baskoutas, Sotirios
[1
,2
]
Bester, Gabriel
[1
]
机构:
[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
[2] Univ Patras, Dept Mat Sci, Patras 26504, Greece
关键词:
QUANTUM CONFINEMENT;
NANOSTRUCTURES;
GROWTH;
DOTS;
NANOCRYSTALS;
NANOWIRES;
ARRAYS;
RODS;
D O I:
10.1021/jp204299m
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
We study the electronic and optical properties of ZnO nanorods as a function of the aspect ratio using atomistic empirical pseudopotentials and configuration interaction for the excitonic states. We find a sharp crossover for the optical polarization, from an in-plane polarized luminescence, for an aspect ratio smaller than 3, to an out-of-plane (along c-axis) polarization for an aspect ratio larger than 3. This suggests the possibility to tailor the optical polarization by a change in morphology. We elucidate the underlying mechanism from an analysis of the valence band structure and highlight the importance of exciton correlations, which shift the crossover to a larger aspect ratio.
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页码:15862 / 15867
页数:6
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