Excitonic origin of enhanced luminescence quantum efficiency in MgZnO/ZnO coaxial nanowire heterostructures

被引：17
|
作者：
Yoo, Jinkyoung [1 ,2 ,3 ]
Chon, Bonghwan [4 ]
Tang, Wei [5 ]
Joo, Taiha [4 ]
Dang, Le Si [6 ,7 ]
Yi, Gyu-Chul [1 ,2 ]
机构：
[1] Seoul Natl Univ, Ctr Semicond Nanorods, Natl Creat Res Initiat, Seoul 151747, South Korea
[2] Seoul Natl Univ, Dept Phys & Astron, Seoul 151747, South Korea
[3] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA
[4] POSTECH, Dept Chem, Pohang 790784, Gyeongbuk, South Korea
[5] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90024 USA
[6] CNRS, Inst Neel, F-38042 Grenoble, France
[7] Univ Grenoble 1, F-38042 Grenoble, France
来源：
APPLIED PHYSICS LETTERS | 2012年 / 100卷 / 22期
基金：
新加坡国家研究基金会;
关键词：
ZNO NANORODS;
D O I：
10.1063/1.4721519
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The effect of exciton transport on luminescence efficiency was investigated by time-resolved photoluminescence and spatially resolved cathodoluminescence spectroscopy. The internal quantum efficiency of ZnO nanowire (NW) increased from 45% to 56% due to formation of a MgZnO/ZnO coaxial NW heterostructure. MgZnO shell layer formation induced a decrease in the exciton diffusion length and diffusion coefficient from 150 to 120 nm and 9.8 to 6.4 cm(2)/s, respectively. The change in exciton transport characteristics indicated that exciton transport, in addition to the surface passivation effect, was an important factor determining the luminescence efficiency in the coaxial NW heterostructure. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4721519]
引用
收藏
页数：4
相关论文
共 50 条
  • [31] Improvements in quantum efficiency of excitonic emissions in ZnO epilayers by the elimination of point defects
    Chichibu, S.F.
    Onuma, T.
    Kubota, M.
    Uedono, A.
    Sota, T.
    Tsukazaki, A.
    Ohtomo, A.
    Kawasaki, M.
    Journal of Applied Physics, 2006, 99 (09):
  • [32] Avalanche Effect and High External Quantum Efficiency in MgZnO/Au/ZnO Sandwich Structure Photodetector
    Zhao, Xinjing
    Jiang, Dayong
    Zhao, Man
    Duan, Yuhan
    ADVANCED OPTICAL MATERIALS, 2021, 9 (08):
  • [33] Enhanced power conversion efficiency of CdS quantum dot sensitized solar cells with ZnO nanowire arrays as the photoanodes
    Qi, Junjie
    Liu, Wang
    Biswas, Chandan
    Zhang, Guangjie
    Sun, Lifang
    Wang, Zengze
    Hu, Xiaofeng
    Zhang, Yue
    OPTICS COMMUNICATIONS, 2015, 349 : 198 - 202
  • [34] Tunable band offset and recombination in ZnO nanowire-CdTe quantum dot heterostructures
    He, Haiping
    Gan, Lu
    Sun, Luwei
    Ye, Zhizhen
    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 2017, 123 (10):
  • [35] Enhanced room temperature excitonic luminescence in ZnO/polymethyl methacrylate nanocomposites prepared by bulk polymerization
    Paramo, J. Antonio
    Strzhemechny, Yuri M.
    Anzlovar, Alojz
    Zigon, Majda
    Orel, Zorica Crnjak
    JOURNAL OF APPLIED PHYSICS, 2010, 108 (02)
  • [36] Enhanced photocurrent gain by CdTe quantum dot modified ZnO nanowire
    Li, Lei
    Yang, Shuming
    Jing, Weixuan
    Jiang, Zhuangde
    Han, Feng
    SENSORS AND ACTUATORS A-PHYSICAL, 2015, 232 : 292 - 298
  • [37] Enhanced secondary electron emission from group III nitride/ZnO coaxial nanorod heterostructures
    Lau, SP
    Huang, L
    Yu, SF
    Yang, HY
    Yoo, JK
    An, SJ
    Yi, GC
    SMALL, 2006, 2 (06) : 736 - 740
  • [38] Quantum confinement observed in ultrafine ZnO and ZnO/Zn0.8Mg0.2O coaxial nanorod heterostructures
    Park, WI
    An, SJ
    Yi, GC
    Kim, MY
    2004 4TH IEEE CONFERENCE ON NANOTECHNOLOGY, 2004, : 83 - 85
  • [39] The influence of particle size on the luminescence quantum efficiency of nanocrystalline ZnO particles
    van Dijken, A
    Makkinje, J
    Meijerink, A
    JOURNAL OF LUMINESCENCE, 2001, 92 (04) : 323 - 328
  • [40] Enhanced external quantum efficiency in rectangular single nanowire solar cells
    Li, Xiaofeng
    Zhan, Yaohui
    APPLIED PHYSICS LETTERS, 2013, 102 (02)
12345