| Self-Assembled Formation of Well-Aligned Cu-Te Nano-Rods on Heavily Cu-Doped ZnTe Thin Films; 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 ; 2016-12-01 | |
| Source Publication | Nanoscale Research Letters
 ; Nanoscale Research Letters
|
| ISSN | 1556276X 19317573 ; 1556276X 19317573 |
| Volume | 11Issue: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. |
| Keyword | Heavily Cu-doped ZnTe Heavily Cu-doped ZnTe MBE MBE Self-assembled nano-rods Self-assembled nano-rods Surface modulation Surface modulation |
| DOI | 10.1186/s11671-016-1741-x ; 10.1186/s11671-016-1741-x |
| URL | View the original ; View the original |
| Language | 英語 ; 英語 |
| Fulltext Access | |
| 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, Self-Assembled Formation of Well-Aligned Cu-Te Nano-Rods on Heavily Cu-Doped ZnTe Thin Films[J]. Nanoscale Research Letters, Nanoscale Research Letters,2016, 2016,11, 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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