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Electrostatic Spray Deposition of Highly Transparent Silver Nanowire Electrode on Flexible Substrate Taegeon Kim, Ali Canlier, Geun-Hong Kim, Jaeho Choi, Minkyu Park, and Seung Min Jane Han ACS Appl. Mater. Interfaces, Just Accepted Manuscript • DOI: 10.1021/am3023543 • Publication Date (Web): 31 Dec 2012 Downloaded from http://pubs.acs.org on January 6, 2013
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ACS Applied Materials & Interfaces
Electrostatic Spray Deposition of Highly Transparent Silver Nanowire Electrode on Flexible Substrate Taegeon Kim1, Ali Canlier1, Geun Hong Kim2, Jaeho Choi2, Minkyu Park1, Seung Min Han1* 1
Graduate School of Energy Environment Water and Sustainability, Korea Advanced Institute of
Science & Technology, Daejeon 305-701, Korea 2
Agency for Defense Development, Yuseong, P.O. Box 35-4, Daejeon, 305-600, Korea
*
Corresponding author e-mail:
[email protected] Abstract In this work, a modified polyol synthesis by adding KBr and by replacing the AgCl with NaCl seed was used to obtain high quality silver nanowires with long aspect ratios with an average length of 13.5 µm in length and 62.5 nm in diameter. The Ag nanowires suspended in methanol solution after removing any unwanted particles using a glass filter system were then deposited on a flexible polycarbonate substrate using an electrostatic spray system. Transmittance of 92.1% at wavelength of 550 nm with sheet resistance of 20 Ω/sq and haze of 4.9% were measured for the electrostatic sprayed Ag nanowire transparent electrode.
Keyword transparent electrode, silver, nanowire, polyol, electrostatic spray, flexible substrate
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Introduction With advances in current technological developments in displays and solar cells, there is an ever increasing demand for low-cost transparent electrode materials. The most widely used transparent electrode material is indium tin oxide (ITO) owing to its high optical transparency and low sheet resistance1,2,3, but ITO is not able to meet the current and future demands for transparent electrode in many different applications including displays and solar cells due to the scarcity and high cost of indium. In addition, ITO is unsuitable for flexible displays and electronics due to the intrinsic brittleness that will result in brittle fracture after 1% strain4,5 as well as due to the high processing temperatures for deposition that may be unsuitable for flexible polymer materials. Therefore, there is a need to develop a new material to replace ITO for future flexible display, electronics, and solar cell applications.
Promising candidates for replacing ITO for flexible transparent electrode applications include metal nanowires, single-walled carbon nanotubes (CNT), and graphenes. Among these candidates, metal nanowires are especially promising due to the higher conductivity of metal nanowires when compared to the carbon based CNTs and graphenes. Silver has one of the highest conductivities among different metal choices (Ag = 6.3 x 107 S·m-1)6, and several previous studies have indicated that transparent electrode with sheet resistance Rs
