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Conductive and Transparent Properties of ZnO/Cu/ZnO Sandwich Structure

The conductive and transparent properties of ZnO/Cu/ZnO sandwich structures were investigated in this study. The I – V curves of single ZnO films with different thicknesses were recorded and plotted. The linear I – V curves confirmed the ohmic conduction mechanism for the ZnO thin films in the ZnO/C...

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Published in:Journal of electronic materials 2021-03, Vol.50 (3), p.779-785
Main Authors: Chen, Wei-Hao, Chou, Chia-Yueh, Li, Bao-Jhen, Yeh, Ching-Yu, Huang, Bo-Rong, Hsu, Mao-Feng, Chung, Sheng-Feng, Liu, Cheng-Yi
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cited_by cdi_FETCH-LOGICAL-c319t-3047da045bc84234e2146ede421db47094b3bf4fe8a8c1689f0bf13f24894a6a3
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description The conductive and transparent properties of ZnO/Cu/ZnO sandwich structures were investigated in this study. The I – V curves of single ZnO films with different thicknesses were recorded and plotted. The linear I – V curves confirmed the ohmic conduction mechanism for the ZnO thin films in the ZnO/Cu/ZnO sandwich structures. Moreover, the energy band diagram of the ZnO/Cu interface showed that the interface between ZnO and Cu exhibited ohmic contact behavior. The resistivity of the ZnO/Cu/ZnO sandwich structures (with thicknesses between 20/5/20 nm and 80/5/80 nm) ranged from 2.25 × 10 −4  Ω cm to 9.72 × 10 −4  Ω cm. The lowest resistivity (i.e., 2.25 × 10 −4  Ω cm) occurred in the 20/5/20 nm thin film. In the ZnO/Cu/ZnO sandwich structures, the electrons are transported vertically through the upper ZnO thin film and transported horizontally in the sandwiched Cu thin film. Ohmic conduction behavior was verified throughout the conduction path in the ZnO/Cu/ZnO sandwich structure. The transmittance measurement in the visible region of the structures showed that the sandwiched ZnO layers increased the transmittance of the 5 nm Cu thin film. In addition, the transmittance of the ZnO/Cu/ZnO sandwich structure was dependent on the thickness of the sandwiched ZnO layers. The 60/5/60 nm sandwich structure exhibited the best enhancement effect on transmittance. The thickness dependence was found to be due to the destructive interference between the reflected light at the ZnO/Cu and Cu/ZnO interfaces in the ZnO/Cu/ZnO sandwich structures.
doi_str_mv 10.1007/s11664-020-08471-6
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The I – V curves of single ZnO films with different thicknesses were recorded and plotted. The linear I – V curves confirmed the ohmic conduction mechanism for the ZnO thin films in the ZnO/Cu/ZnO sandwich structures. Moreover, the energy band diagram of the ZnO/Cu interface showed that the interface between ZnO and Cu exhibited ohmic contact behavior. The resistivity of the ZnO/Cu/ZnO sandwich structures (with thicknesses between 20/5/20 nm and 80/5/80 nm) ranged from 2.25 × 10 −4  Ω cm to 9.72 × 10 −4  Ω cm. The lowest resistivity (i.e., 2.25 × 10 −4  Ω cm) occurred in the 20/5/20 nm thin film. In the ZnO/Cu/ZnO sandwich structures, the electrons are transported vertically through the upper ZnO thin film and transported horizontally in the sandwiched Cu thin film. Ohmic conduction behavior was verified throughout the conduction path in the ZnO/Cu/ZnO sandwich structure. The transmittance measurement in the visible region of the structures showed that the sandwiched ZnO layers increased the transmittance of the 5 nm Cu thin film. In addition, the transmittance of the ZnO/Cu/ZnO sandwich structure was dependent on the thickness of the sandwiched ZnO layers. The 60/5/60 nm sandwich structure exhibited the best enhancement effect on transmittance. 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The transmittance measurement in the visible region of the structures showed that the sandwiched ZnO layers increased the transmittance of the 5 nm Cu thin film. In addition, the transmittance of the ZnO/Cu/ZnO sandwich structure was dependent on the thickness of the sandwiched ZnO layers. The 60/5/60 nm sandwich structure exhibited the best enhancement effect on transmittance. The thickness dependence was found to be due to the destructive interference between the reflected light at the ZnO/Cu and Cu/ZnO interfaces in the ZnO/Cu/ZnO sandwich structures.</abstract><cop>New York</cop><pub>Springer US</pub><doi>10.1007/s11664-020-08471-6</doi><tpages>7</tpages><orcidid>https://orcid.org/0000-0002-0930-2609</orcidid></addata></record>
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1543-186X
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subjects Characterization and Evaluation of Materials
Chemistry and Materials Science
Contact resistance
Electrical resistivity
Electronics and Microelectronics
Emerging Interconnection Technology
Energy bands
Instrumentation
Interconnect
Materials Science
Optical and Electronic Materials
Pb-free Solder
Photovoltaic cells
Sandwich structures
Solid State Physics
Thickness
Thin films
TMS2020 Advanced Microelectronic Packaging
TMS2020 Microelectronic Packaging
Transmittance
Zinc oxide
title Conductive and Transparent Properties of ZnO/Cu/ZnO Sandwich Structure
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