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Structural and multiband photoluminescent properties of a hierarchical ZnO/Si nanoheterostructure

Published online by Cambridge University Press:  26 April 2011

Hai Jun Xu ,
Lei Su ,
Yu Fei Chan  and
Xiao Ming Sun
Hai Jun Xu*
Affiliation:
State Key Laboratory of Chemical Resource Engineering and School of Science, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
Lei Su
Affiliation:
State Key Laboratory of Chemical Resource Engineering and School of Science, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
Yu Fei Chan
Affiliation:
State Key Laboratory of Chemical Resource Engineering and School of Science, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
Xiao Ming Sun
Affiliation:
State Key Laboratory of Chemical Resource Engineering and School of Science, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Hierarchical ZnO/Si nanoheterostructure was prepared by growing oriented ZnO nanowire bundles onto the top of nanoporous silicon pillar array (NSPA) via a self-catalytic thermal evaporation and vapor-phase transport method. Samples were carefully characterized using field emission scanning electron microscopy, x-ray diffraction, and luminescence spectroscopy. One ultraviolet, one blue-green, and two red emission bands were observed in ZnO/NSPA, and the emission mechanism is discussed by developing a model-based energy band diagram. The origins of the ultraviolet and blue-green photoluminescence (PL) bands were attributed to the emission from the band edge transition and surface states of oxygen vacancies of ZnO, while two red PL bands originated from NSPA and could be well explained by the quantum confinement-luminescence center model. The realization of such all solid and wide wavelength nanodevice might be both meaningful for developing new concept lighting devices and potentially extended to fabricate hierarchical Si-based nanoheterostructures in fabricating other optoelectronic nanodevices.

Keywords

PhotoemissionNanostructureOptical properties
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 9 , 14 May 2011 , pp. 1174 - 1178
Copyright
Copyright © Materials Research Society 2011

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