Статья

Photoluminescence and Electron Paramagnetic Resonance of ZnO Tetrapod Structures

Aleksandra B. DjurišićUniversity of Hong KongWallace C. H. ChoyDepartment of Electrical & Electronic Engineering, University of Hong Kong, Pokfulam Road, Hong KongVellaisamy A. L. RoyDepartment of Electrical & Electronic Engineering, University of Hong Kong, Pokfulam Road, Hong KongY. H. LeungDepartment of Physics, The University of Hong Kong, Pokfulam Road, Hong KongC.Y. KwongDepartment of Electrical & Electronic Engineering, University of Hong Kong, Pokfulam Road, Hong KongKok‐Wai CheahDepartment of Physics, Hong Kong Baptist University, Kowloon Tong, Hong KongT.K. Gundu RaoRSIC, Indian Institute of Technology, Mumbai, IndiaWai Kin ChanDepartment of Chemistry, The University of Hong Kong, Pokfulam Road, Hong KongH. F. LuiDepartment of Electronic and Information Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong KongC. SuryaDepartment of Electronic and Information Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong

2004en

ABI

Аннотация

Abstract ZnO tetrapod nanostructures have been prepared by the evaporation of Zn in air (no flow), dry and humid argon flow, and dry and humid nitrogen flow. Their properties have been investigated using scanning electron microscopy (SEM), X‐ray diffraction (XRD), photoluminescence (PL) and photoluminescence excitation (PLE) spectroscopies (at different temperatures), and electron paramagnetic resonance (EPR) spectroscopy at –160 °C and room temperature. It is found that the fabrication conditions significantly influence the EPR and PL spectra obtained. While a g = 1.96 EPR signal is present in some of the samples, green PL emission can be observed from all the samples. Therefore, the green emission in our samples does not originate from the commonly assumed transition between a singly charged oxygen vacancy and a photoexcited hole [K. Vanheusden, C. H. Seager, W. L. Warren, D. R. Tallant, J. A. Voigt, Appl. Phys. Lett . 1996 , 68 , 403]. However, the green emission can be suppressed by coating the nanostructures with a surfactant for all fabrication conditions, which indicates that this emission originates from surface defects.

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Идентификаторы

DOI: 10.1002/adfm.200305082

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