Fabrication of Silver Nanowire Transparent Electrodes at Room Temperature
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Silver nanowires (AgNWs) surrounded by insulating poly(vinylpyrrolidone) have been synthesized by a polyol process and employed as transparent electrodes. The AgNW transparent electrodes can be fabricated by heattreatment at about 200 ℃ which forms connecting junctions between AgNWs. Such a heating process is, however, one of the drawbacks of the fabrication of AgNW electrodes on heat-sensitive substrates. Here it has been demonstrated that the electrical conductivity of AgNW electrodes can be improved by mechanical pressing at 25 MPa for 5 s at room temperature. This simple process results in a low sheet resistance of 8.6 Ω/square and a transparency of 80.0%, equivalent to the properties of the AgNW electrodes heated at 200 ℃. This technique makes it possible to fabricate AgNW transparent electrodes on heat-sensitive substrates. The AgNW electrodes on poly(ethylene terephthalate) films exhibited high stability of their electrical conductivities against the repeated bending test. In addition, the surface roughness of the pressed AgNW electrodes is one-third of that of the heat-treated electrode because the AgNW junctions are mechanically compressed. As a result, an organic solar cell fabricated on the pressed AgNW electrodes exhibited a power conversion as much as those fabricated on indium tin oxide electrodes. These findings enable continuous roll-to-roll processing at room temperature, resulting in relatively simple, inexpensive, and scalable processing that is suitable for forthcoming technologies such as organic solar cells, flexible displays, and touch screens.
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Fabrication of Silver Nanowire Transparent Electrodes at Room Temperature
),
Abstract
Silver nanowires (AgNWs) surrounded by insulating poly(vinylpyrrolidone) have been synthesized by a polyol process and employed as transparent electrodes. The AgNW transparent electrodes can be fabricated by heattreatment at about 200 ℃ which forms connecting junctions between AgNWs. Such a heating process is, however, one of the drawbacks of the fabrication of AgNW electrodes on heat-sensitive substrates. Here it has been demonstrated that the electrical conductivity of AgNW electrodes can be improved by mechanical pressing at 25 MPa for 5 s at room temperature. This simple process results in a low sheet resistance of 8.6 Ω/square and a transparency of 80.0%, equivalent to the properties of the AgNW electrodes heated at 200 ℃. This technique makes it possible to fabricate AgNW transparent electrodes on heat-sensitive substrates. The AgNW electrodes on poly(ethylene terephthalate) films exhibited high stability of their electrical conductivities against the repeated bending test. In addition, the surface roughness of the pressed AgNW electrodes is one-third of that of the heat-treated electrode because the AgNW junctions are mechanically compressed. As a result, an organic solar cell fabricated on the pressed AgNW electrodes exhibited a power conversion as much as those fabricated on indium tin oxide electrodes. These findings enable continuous roll-to-roll processing at room temperature, resulting in relatively simple, inexpensive, and scalable processing that is suitable for forthcoming technologies such as organic solar cells, flexible displays, and touch screens.
References(32)
Fraser, D. B.; Cook, H. D. Highly conductive, transparent films of sputtered In2-xSnxO3-y. J. Electrochem. Soc. 1972, 119, 1368–1374.
Lewis, B. G.; Paine, D. C. Applications and processing of transparent conducting oxides. MRS Bull. 2000, 25, 22–27.
Minami, T. Transparent conducting oxide semiconductors for transparent electrodes. Semicond. Sci. Technol. 2005, 20, S35–S44.
Kuznetsov, V. L.; Edwards, P. P. Functional materials for sustainable energy technologies: Four case studies. ChemSusChem2010, 3, 44–58.
MacDiarmid, A. G. "Synthetic metals": A novel role for organic polymers (Nobel lecture). Angew. Chem. Int. Ed. 2001, 40, 2581–2590.
Kim, K. S.; Zhao, Y.; Jang, H.; Lee, S. Y.; Kim, J. M.; Kim, K. S.; Ahn, J. H.; Kim, P.; Choi, J. Y.; Hong, B. H. Large-scale pattern growth of graphene films for stretchable transparent electrodes. Nature2009, 457, 706–710.
Kumar, S.; Zhou, C. The race to replace tin-doped indium oxide: Which materials will win? ACS Nano2010, 4, 11–14.
Yamaguchi, H.; Eda, G.; Mattevi, C.; Kim, H.; Chhowalla, M. Highly uniform 300 mm wafer-scale deposition of single and multilayered chemically derived graphene thin films. ACS Nano2010, 4, 524–528.
Bae, S.; Kim, H.; Lee, Y.; Xu, X.; Park, J. S.; Zheng, Y.; Balakrishnan, J.; Lei, T.; Kim, H. R.; Song, Y. I., et al. Rollto- roll production of 30-inch graphene films for transparent electrodes. Nat. Nanotechnol. 2010, 5, 574–578.
Feng, C.; Liu, K.; Wu, J. S.; Liu, L.; Cheng, J. S.; Zhang, Y.; Sun, Y.; Li, Q.; Fan, S.; Jiang, K. Flexible, stretchable, transparent conducting films made from superaligned carbon nanotubes. Adv. Funct. Mater. 2010, 20, 885–891.
Hecht, D. S.; Hu, L.; Irvin, G. Emerging transparent electrodes based on thin films of carbon nanotube, graphene, and metallic nanostructures. Adv. Mater. 2011, 23, 1482–1513.
Lee, J. Y.; Connor, S. T.; Cui, Y.; Peumans, P. Solutionprocessed metal nanowire mesh transparent electrodes. Nano Lett. 2008, 8, 689–692.
De, S.; Higgins, T. M.; Lyons, P. E.; Doherty, E. M.; Nirmalraj, P. N.; Blau, W. J.; Boland, J. J.; Coleman, J. N. Silver nanowire networks as flexible, transparent, conducting films: Extremely high DC to optical conductivity ratios. ACS Nano2009, 3, 1767–1774.
Azulai, D.; Belenkova, T.; Gilon, H.; Barkay, Z.; Markovich, G. Transparent metal nanowire thin films prepared in mesostructured templates. Nano Lett. 2009, 9, 4246–4249.
Hu, L. B.; Kim, H. S.; Lee, J. Y.; Peumans, P.; Cui, Y. Scalable coating and properties of transparent, flexible, silver nanowire electrodes. ACS Nano2010, 4, 2955–2963.
Madaria, A. R.; Kumar, A.; Ishikawa, F. N.; Zhou, C. W. Uniform, highly conductive, and patterned transparent films of a percolating silver nanowire network on rigid and flexible substrates using a dry transfer technique. Nano Res. 2010, 3, 564–573.
Zeng, X. Y.; Zhang, Q. K.; Yu, R. M.; Lu, C. Z. A new transparent conductor: Silver nanowire film buried at the surface of a transparent polymer. Adv. Mater. 2010, 22, 4484–4488.
Gaynor, W.; Lee, J. Y.; Peumans, P. Fully solution-processed inverted polymer solar cells with laminated nanowire electrodes. ACS Nano2010, 4, 30–34.
Lee, J. Y.; Connor, S. T.; Cui, Y.; Peumans, P. Semitransparent organic photovoltaic cells with laminated top electrode. Nano Lett. 2010, 10, 1276–1279.
Lu, Y. C.; Chou, K. S. Tailoring of silver wires and their performance as transparent conductive coatings. Nanotechnology2010, 21, 215707.
Yu, Z. B.; Zhang, Q. W.; Li, L.; Chen, Q.; Niu, X. F.; Liu, J.; Pei, Q. B. Highly flexible silver nanowire electrodes for shape-memory polymer light-emitting diodes. Adv. Mater. 2011, 23, 664–668.
Madaria, A. R.; Kumar, A.; Zhou, C. W. Large scale, highly conductive and patterned transparent films of silver nanowires on arbitrary substrates and their application in touch screens. Nanotechnology2011, 22, 245201.
Gaynor, W.; Burkhard, G. F.; McGehee, M. D.; Peumans, P. Smooth nanowire/polymer composite transparent electrodes. Adv. Mater. 2011, 23, 2905–2910.
Hardin, B. H.; Gaynor, W.; Ding, I. K.; Rim, S. B.; Peumans, P.; McGehee, M. D. Laminating solution-processed silver nanowire mesh electrodes onto solid-state dye-sensitized solar cells. Org. Electron. 2011, 12, 875–879.
Zhu, Y.; Hill, C. M.; Pan, S. Reductive-oxidation electrogenerated chemiluminescence (ECL) generation at a transparent silver nanowire electrode. Langmuir 2011, 27, 3121–3127.
Jiu, J. T.; Murai, K.; Kim, D.; Kim, K.; Suganuma, K. Preparation of Ag nanorods with high yield by polyol process. Mater. Chem. Phys. 2009, 114, 333–338.
Sun, Y. G.; Gates, B.; Mayers, B.; Xia, Y. N. Crystalline silver nanowires by soft solution processing. Nano Lett. 2002, 2, 165–168.
Wang, H. S.; Qiao, X. L; Chen, J. G.; Wang, X. J.; Ding, S. Y. Mechanisms of PVP in the preparation of silver nanoparticles. Mater. Chem. Phys. 2005, 94, 449–453.
Wiley, B.; Sun, Y. G.; Mayers, B.; Xia, Y. N. Shapecontrolled synthesis of metal nanostructures: The case of silver. Chem. Eur. J. 2005, 11, 454–463.
Sun, Y. G. Silver nanowires-unique templates for functional nanostructures. Nanoscale2010, 2, 1626–1642.
Wakuda, D.; Hatamura, M.; Suganuma, K. Novel method for room temperature sintering of Ag nanoparticle paste in air. Chem. Phys. Lett. 2007, 441, 305–308.
Nogi, M.; Iwamoto, S.; Nakagaito, A. N.; Yano, H. Optically transparent nanofiber paper. Adv. Mater. 2009, 21, 1595–1598.
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