Self-Assembled Formation of Well-Aligned Cu-Te Nano-Rods on Heavily Cu-Doped ZnTe Thin Films

doi:10.1186/s11671-016-1741-x

	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 Publication	Nanoscale Research Letters
ISSN	1556276X 19317573
Volume	11 Issue:1
Abstract	Cu 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.
Keyword	Heavily Cu-doped ZnTe MBE Self-assembled nano-rods Surface modulation
DOI	10.1186/s11671-016-1741-x
URL	View the original
Language	英語
Fulltext Access	View Full-Text via DOI View Full-Text via Scopus
Citation statistics
Document Type	Journal article
Collection	University of Macau
Affiliation	1.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
Recommended Citation 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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