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Self-Assembled Formation of Well-Aligned Cu-Te Nano-Rods on Heavily Cu-Doped ZnTe Thin Films
Liang J.1; Cheng M.K.1; Lai Y.H.1; Wei G.1; Yang S.D.1; Wang G.3; Ho S.K.2; Tam K.W.2; Sou I.K.1
2016-12-01
Source PublicationNanoscale Research Letters
ISSN1556276X 19317573
Volume11Issue:1
AbstractCu doping of ZnTe, which is an important semiconductor for various optoelectronic applications, has been successfully achieved previously by several techniques. However, besides its electrical transport characteristics, other physical and chemical properties of heavily Cu-doped ZnTe have not been reported. We found an interesting self-assembled formation of crystalline well-aligned Cu-Te nano-rods near the surface of heavily Cu-doped ZnTe thin films grown via the molecular beam epitaxy technique. A phenomenological growth model is presented based on the observed crystallographic morphology and measured chemical composition of the nano-rods using various imaging and chemical analysis techniques. When substitutional doping reaches its limit, the extra Cu atoms favor an up-migration toward the surface, leading to a one-dimensional surface modulation and formation of Cu-Te nano-rods, which explain unusual observations on the reflection high energy electron diffraction patterns and apparent resistivity of these thin films. This study provides an insight into some unexpected chemical reactions involved in the heavily Cu-doped ZnTe thin films, which may be applied to other material systems that contain a dopant having strong reactivity with the host matrix.
KeywordHeavily Cu-doped ZnTe MBE Self-assembled nano-rods Surface modulation
DOI10.1186/s11671-016-1741-x
URLView the original
Language英語
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Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.Hong Kong University of Science and Technology, William Mong Institute of Nano Science & Technology
2.Universidade de Macau
3.Southern University of Science and Technology
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GB/T 7714
Liang J.,Cheng M.K.,Lai Y.H.,et al. Self-Assembled Formation of Well-Aligned Cu-Te Nano-Rods on Heavily Cu-Doped ZnTe Thin Films[J]. Nanoscale Research Letters,2016,11(1).
APA Liang J..,Cheng M.K..,Lai Y.H..,Wei G..,Yang S.D..,...&Sou I.K..(2016).Self-Assembled Formation of Well-Aligned Cu-Te Nano-Rods on Heavily Cu-Doped ZnTe Thin Films.Nanoscale Research Letters,11(1).
MLA Liang J.,et al."Self-Assembled Formation of Well-Aligned Cu-Te Nano-Rods on Heavily Cu-Doped ZnTe Thin Films".Nanoscale Research Letters 11.1(2016).
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