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Mg-induced Enhancement of ZnO Optical Properties via Electrochemical Processing

Published online by Cambridge University Press:  21 May 2012

Hongtao Shi ,
Kalie R. Barrera ,
Timothy L. Hessong  and
Cristhyan F. Alfaro
Hongtao Shi
Affiliation:
Department of Physics and Astronomy, Sonoma State University, Rohnert Park, CA 94928, U.S.A.
Kalie R. Barrera
Affiliation:
Department of Physics and Astronomy, Sonoma State University, Rohnert Park, CA 94928, U.S.A.
Timothy L. Hessong
Affiliation:
Department of Physics and Astronomy, Sonoma State University, Rohnert Park, CA 94928, U.S.A.
Cristhyan F. Alfaro
Affiliation:
Department of Physics and Astronomy, Sonoma State University, Rohnert Park, CA 94928, U.S.A.
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Abstract

Electrochemical deposition was used to fabricate polycrystalline ZnO thin films in solutions containing zinc nitrate and hexamethylenetetramine. All samples showed intense UV photoluminescence (PL) near the band edge in addition to weak broad bands due to defects. When the source solution was slightly doped with Mg2+ ions, the defect induced emission was significantly suppressed while the UV peak position and intensity remained the same. Auger electron spectroscopy revealed no Mg contents in the films within the detection limit. A possible growth mechanism was proposed, based on the chemical reactivity of Mg and Zn, to interpret the observed PL data, which is supported by samples grown in Ca-doped solutions.

Keywords

Auger electron spectroscopy (AES)chemical synthesissemiconducting
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1449: Symposium BB – Solution Synthesis of Inorganic Films and Nanostructured Materials , 2012 , mrss12-1449-bb03-07
Copyright
Copyright © Materials Research Society 2012

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