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Self-Assembled Formation of Well-Aligned Cu-Te Nano-Rods on Heavily Cu-Doped ZnTe Thin Films
Jing Liang1; Man Kit Cheng1; Ying Hoi Lai1; Guanglu Wei1; Sean Derman Yang1; Gan Wang2; Sut Kam Ho3; Kam Weng Tam3; Iam Keong Sou1
2016-11-29
Source PublicationNanoscale Research Letters
ISSN1556-276X
Volume11Issue: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.;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.

KeywordHeavily Cu-doped Znte Heavily Cu-doped Znte Mbe Mbe Self-assembled Nano-rods Self-assembled Nano-rods Surface Modulation Surface Modulation
DOI10.1186/s11671-016-1741-x
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaScience & Technology - Other Topics ; Materials Science ; Physics
WOS SubjectNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied
WOS IDWOS:000389197900002
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Document TypeJournal article
CollectionFaculty of Science and Technology
Affiliation1.Department of Physics and William Mong Institute of Nano Science and Technology, The Hong Kong University of Science and Technology, Room 4459, Academic Building, Clear Water Bay, Kowloon, Hong Kong, People’s Republic of China.
2.Department of Physics, South University of Science and Technology of China, 1088 Xueyuan Rd., Nanshan District, Shenzhen, Guangdong, People’s Republic of China.
3.Faculty of Science and Technology, University of Macau, E11 Avenida da Universidade, Taipa, Macau, China.
Recommended Citation
GB/T 7714
Jing Liang,Man Kit Cheng,Ying Hoi Lai,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 Jing Liang,Man Kit Cheng,Ying Hoi Lai,Guanglu Wei,Sean Derman Yang,Gan Wang,Sut Kam Ho,Kam Weng Tam,&Iam Keong Sou.(2016).Self-Assembled Formation of Well-Aligned Cu-Te Nano-Rods on Heavily Cu-Doped ZnTe Thin Films.Nanoscale Research Letters,11(1).
MLA Jing Liang,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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