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Photoluminescence and I–V characteristics of ZnS grown on silicon nanoporous pillar array

Published online by Cambridge University Press:  31 January 2011

Hai Jun Xu ,
He Shun Jia ,
Zhi Tao Yao  and
Xin Jian Li
Hai Jun Xu
Affiliation:
Department of Physics and Laboratory of Material Physics, Zhengzhou University, Zhengzhou 450052, People’s Republic of China
He Shun Jia
Affiliation:
Department of Physics and Laboratory of Material Physics, Zhengzhou University, Zhengzhou 450052, People’s Republic of China
Zhi Tao Yao
Affiliation:
Department of Physics and Laboratory of Material Physics, Zhengzhou University, Zhengzhou 450052, People’s Republic of China
Xin Jian Li*
Affiliation:
Department of Physics and Laboratory of Material Physics, Zhengzhou University, Zhengzhou 450052, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Silicon nanoporous pillar array (Si-NPA) is a silicon hierarchical structure with regularly patterned surface morphology. Through a heterogeneous reaction process, zinc sulfide nanocrystallites (nc-ZnS) were grown onto Si-NPA and a unique heterostructure of ZnS/Si-NPA was obtained. The formation of wurtzite nc-ZnS was proved by x-ray diffraction, and the average grain size was evaluated to be ∼18 nm. X-ray photoelectron spectroscopy disclosed that as-grown nc-ZnS was well separated from Si-NPA by a SiO2 thin layer of ∼1.3 nm. The photoluminescence (PL) spectrum of ZnS/Si-NPA showed that in addition to the two red PL bands peaked at ∼648 and ∼705 nm observed in Si-NPA, three other PL bands peaked at ∼365, ∼418, and ∼472 nm were observed and attributed to the PL from nc-ZnS. It was also demonstrated that as-prepared ZnS/Si-NPA heterostructure could exhibit good rectification characteristic featured by a high forward current density of ∼75 mA/cm2 at 2 V and high reverse breakdown voltage of ∼10 V. Our results indicated that ZnS/Si-NPA might be a valuable heterostructure nanosystem to be further probed for achieving enhanced optical and electrical properties.

Keywords

LuminescenceNanostructureElectrical properties
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 1 , January 2008 , pp. 121 - 126
Copyright
Copyright © Materials Research Society 2008

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