Neutral-pH PEDOT:PSS as over-coating layer for stable silver nanowire flexible transparent conductive films |
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Authors: | S. Chen L. Song Z. Tao X. Shao Y. Huang Q. Cui X. Guo |
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Affiliation: | 1. National Engineering Laboratory for TFT-LCD Material and Technologies, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Shanghai OE Chemicals, 200232, China |
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Abstract: | The silver nanowire (AgNW) mesh film with poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) as the over-coating layer is a promising flexible transparent conductive film technology. In this work, experimental studies show that the hygroscopic and acid properties of the common PEDOT:PSS lead to poor stabilities of the composite films, due to the conductivity degradation of PEDOT:PSS by the water absorption and the acid corrosion of AgNWs by PEDOT:PSS. By using the modified PEDOT:PSS of neutral pH as the over-coating layer, the long term shelf-life time, thermal and current stressing stabilities are all significantly improved without sacrifice of transparency, electrical conductivity and mechanical flexibility. Under both cases of thermal aging test at 210 °C for 20 min and 12 h continuous current stressing at a current density of 30 mA/cm2, no obvious change of the conductivity is observed. The results clearly demonstrate that using the neutral-pH PEDOT:PSS as an over-coating layer can help to achieve flexible AgNW transparent conductive films with superior stability for flexible optoelectronic devices. |
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Keywords: | Transparent conductive film Silver nanowire PEDOT:PSS Stability |
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