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.
引用
收藏
页码:15862 / 15867
页数:6
相关论文
共 36 条
[1]   Growth of ZnO nanorods from a salt mixture [J].
Baranov, AN ;
Panin, GN ;
Kang, TW ;
Oh, YJ .
NANOTECHNOLOGY, 2005, 16 (09) :1918-1923
[2]   Facile chemical approach to ZnO submicrometer particles with controllable morphologies [J].
Bardhan, Rizia ;
Wang, Hui ;
Tam, Felicia ;
Halas, Naomi J. .
LANGMUIR, 2007, 23 (11) :5843-5847
[3]   Conventional Optics from Unconventional Electronics in ZnO Quantum Dots [J].
Baskoutas, Sotirios ;
Bester, Gabriel .
JOURNAL OF PHYSICAL CHEMISTRY C, 2010, 114 (20) :9301-9307
[4]   Prediction of a shape-induced enhancement in the hole relaxation in nanocrystals [J].
Califano, M ;
Bester, G ;
Zunger, A .
NANO LETTERS, 2003, 3 (09) :1197-1202
[5]   OPTICAL PROPERTIES OF SILVER AND CUPROUS HALIDES [J].
CARDONA, M .
PHYSICAL REVIEW, 1963, 129 (01) :69-+
[6]   Calculated spin-orbit splitting of all diamondlike and zinc-blende semiconductors:: Effects of p1/2 local orbitals and chemical trends -: art. no. 035212 [J].
Carrier, P ;
Wei, SH .
PHYSICAL REVIEW B, 2004, 70 (03) :035212-1
[7]   Finite size effect in ZnO nanowires [J].
Chang, Pai-Chun ;
Chien, Chung-Jen ;
Stichtenoth, Daniel ;
Ronning, Carsten ;
Lu, Jia Grace .
APPLIED PHYSICS LETTERS, 2007, 90 (11)
[8]   Novel ZnO nanostructures grown on carbon nanotubes by thermal evaporation [J].
Chrissanthopoulos, A. ;
Baskoutas, S. ;
Bouropoulos, N. ;
Dracopoulos, V. ;
Tasis, D. ;
Yannopoulos, S. N. .
THIN SOLID FILMS, 2007, 515 (24) :8524-8528
[9]   Optical properties of ZnO nanostructures: a hybrid DFT/TDDFT investigation [J].
De Angelis, Filippo ;
Armelao, Lidia .
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2011, 13 (02) :467-475
[10]   Optical properties of ZnO nanostructures [J].
Djurisic, Aleksandra B. ;
Leung, Yu Hang .
SMALL, 2006, 2 (8-9) :944-961