Linear dipole behavior of single quantum dots encased in metal oxide semiconductor nanoparticles films

doi:10.1007/s11467-018-0874-z

Front. Phys.

2019, Vol. 14

Issue (2) : 23605 https://doi.org/10.1007/s11467-018-0874-z

RESEARCH ARTICLE

Linear dipole behavior of single quantum dots encased in metal oxide semiconductor nanoparticles films

Guo-Feng Zhang^1,⁴(

), Yong-Gang Peng², Hai-Qing Xie³, Bin Li¹, Zhi-Jie Li¹, Chang-Gang Yang¹, Wen-Li Guo¹, Cheng-Bing Qin^1,⁴, Rui-Yun Chen^1,⁴, Yan Gao^1,⁴, Yu-Jun Zheng², Lian-Tuan Xiao^1,⁴(

), Suo-Tang Jia^1,⁴

¹. State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
². School of Physics, Shandong University, Jinan 250100, China
³. Department of Physics, Taiyuan Normal University, Jinzhong 030619, China
⁴. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China

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Abstract

Understanding of charge/energy exchange processes and interfacial interactions that occur between quantum dots (QDs) and the metal oxides is of critical importance to these QD-based optoelectronic devices. This work reports on linear dipole behavior of single near-infrared emitting CdSeTe/ZnS core/shell QDs which are encased in indium tin oxide (ITO) semiconductor nanoparticles films. A strong polarization anisotropy in photoluminescence emission is observed by defocused wide-field imaging and polarization measurement techniques, and the average polarization degree is up to 0.45. A possible mechanism for the observation is presented in which the electrons, locating at single QD surface from ITO by electron transfer due to the equilibration of the Fermi levels, result in a significant Stark distortion of the QD electron/hole wavefunctions. The Stark distortion results in the linear polarization property of the single QDs. The investigation of linear dipole behavior for single QDs encased in ITO films would be helpful for further improving QD-based device performance.

Keywords single quantum dots linear dipole behavior electron transfer polarization property metal oxide nanoparticles

Corresponding Author(s): Guo-Feng Zhang,Lian-Tuan Xiao

Issue Date: 29 November 2018

Cite this article:

Guo-Feng Zhang,Yong-Gang Peng,Hai-Qing Xie, et al. Linear dipole behavior of single quantum dots encased in metal oxide semiconductor nanoparticles films[J]. Front. Phys. , 2019, 14(2): 23605.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-018-0874-z
https://academic.hep.com.cn/fop/EN/Y2019/V14/I2/23605

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