• Journal of the Semiconductor & Display Technology
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• v.13 no.1
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• pp.19-25
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• 2014

This study demonstrates transparent electrodes with characteristics desirable for touch screen panels using carbon nanotubes (CNTs). This has been accomplished by depositing CNTs on glass substrates via spray coating and then depositing thin conductive polymer films on the CNTs via spin coating. For all of the samples, such as CNTs, conductive polymers, and polymer-coated CNTs, the surface morphologies, sheet resistances, visible transmittances, chromatic properties are characterized as functions of their preparation conditions, such as the spray times for CNTs and the spin speeds for conductive polymers. The experimental results confirm that only the polymer-coated CNTs can satisfy all of the requirements that are required for electrodes of touch screen panels, such as the sheet resistance lower than $100{\Omega}/sq$, the visible transmittance higher than 80 %, and the yellowness smaller than 1.

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.217.2-217.2
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• 2014

We prepared a flexible and transparent CuO/Cu/CuO multilayer electrodes on a polyethylene terephthalate (PET) substrate using a specially designed roll-to-roll sputtering system at room temperature for GFF-type touch screen panels (TSPs). By the continuous roll-to-roll sputtering of the CuO and Cu layer, we fabricated a flexible CuO(150nm)/Cu(150nm)/CuO(150nm) multilayer electrodes with a sheet resistance of $0.289{\Omega}/square$, resistivity of $5.991{\times}10^{-23}{\Omega}-cm$, at the optimized condition without breaking the vacuum. To investigate the feasibility of the CuO/Cu/CuO multilayer as a transparent electrode for GFF-type TSPs, we fabricated simple GFF-type TSPs using the diamond patterned CuO/Cu/CuO electrode on PET substrate as function of mesh line width. Using diamond patterned CuO/Cu/CuO electrode of mesh line $5{\mu}m$ with sheet resistance of 38 Ohm/square, optical transmittance of 90% at 550 nm and an average transmittance of 89% at wavelength range from 380 to 780 nm, we successfully demonstrated GFF-type touch panel screens (TPSs). The successful operation of GFF-type TPSs with CuO/Cu/CuO multilayer electrodes indicates that the CuO/Cu/CuO multilayer is a promising transparent electrode for large-area capacitive-type TPSs due to its low sheet resistance and high transparency.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1147-1148
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• 2015

This study demonstrates the coating effect of carbon nanotubes on metal meshes, which have been made with various line-spaces and line-width, for touch screen panels. The CNTs have been deposited on metal meshes via electrophoretic deposition (EPD). The sheet resistances, visible transmittances, visible reflectances have been measured before and after electrophoretic deposition. The experimental results confirm that CNT coating metal meshes with various line-spaces and line width can satisfy the requirements that are required for transparent electrodes of touch screen panels.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1155-1156
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• 2015

This study demonstrates hybrid-type transparent electrodes for touch screen panels. The hybrid-type electrodes were fabricated by coating carbon nanotubes (CNTs) on metal meshes. For the formation of metal meshes, thin films of silver (Ag) were deposited on glass substrates using a sputtering method and then pattenrned via photolithography to obtain mesh structures of which line width was $10{\mu}m$ and line-to-line spacing was $300{\mu}m$. CNTs were coated on Ag meshes by using electrophoretic deposition (EPD). For the samples of Ag meshes with/without CNTs, their surface morphologies, visible-range transmittances, and reflectances were characterized and compared. The experimental results indicated that the reflectance of Ag mesh electrodes was substantially reduced by coating of CNTs. Especially, the hybrid electrodes of Ag meshes with EPD-coated CNTs showed excellent properties such as transmittance higher than 90%, reflectance lower than 8%.

• Journal of the Semiconductor & Display Technology
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• v.14 no.1
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• pp.55-59
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• 2015

This study demonstrates hybrid-type transparent electrodes for touch screen panels. The hybrid-type electrodes were fabricated by coating carbon nanotubes (CNTs) on metal meshes. To form the metal-meshes, thin films of silver (Ag) were deposited on glass substrates using the sputtering method and then patterned via photolithography to obtain mesh structures whose line width was $10{\mu}m$ and line-to-line spacing was $300{\mu}m$. CNTs were coated on Ag-meshes by using two different methods, such as spray coating and electrophoretic deposition (EPD). For the samples of a Ag-meshes and CNTs-coated Ag-meshes, their surface morphologies, electrical sheet resistances, and visible-range transmittances and reflectances were characterized and compared. The experimental results indicated that the reflectance of Ag-mesh electrodes was substantially reduced by coating of CNTs. Especially, the hybrid electrodes of Ag-meshes with EPD-coated CNTs showed excellent properties such as sheet resistance lower than $20{\Omega}/{\Box}$, transmittance higher than 90 %, and reflectance lower than 8%.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1153-1154
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• 2015

In this study, electro-polymerization was used for coating PEDOT:SDS films on CNTs, thereby producing hybrid-type electrodes. The CNTs were deposited on PET substrates using a spray method. For the fabricated hybrid electrodes, their surface morphologies, electric sheet resistances, visible transmittances, and chromatic properties were characterized as functions of the polymerization conditions used for coating PEDOT, and compared with those of conventional CNTs. The experiment results confirmed that the sheet resistance of CNTs was decreased significantly by coating of PEDOT via electropolymerization, and also indicated that the fabricated hybrid electrodes revealed desirable properties as a transparent electrode for touch screen panels.