Electromechanical properties of indium-tin-oxide/poly(3,4-ethylenedioxythiophene): Poly(styrenesulfonate) hybrid electrodes for flexible transparent electrodes

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• 作者：Sunghoon Jung ; Kyounga Lim ; Jae-Wook Kang ; Jong-Kuk Kim ; Se-In Oh ; Kyoungtae Eun ; Do-Geun Kim ; Sung-Hoon Choa
• 关键词：Transparent flexible electrode ; ITO/PEDOT ; PSS hybrid electrode ; Electromechanical properties
• 刊名：Thin Solid Films
• 出版年：1 January, 2014
• 年：2014
• 卷：550
• 期：Complete
• 页码：435-443
• 全文大小：2172 K

文摘

We investigated an indium-tin-oxide (ITO)/poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) hybrid electrode as a potential flexible and transparent electrode. In particular, the mechanical integrity of an ITO/PEDOT:PSS hybrid electrode deposited onto a polyethylene terephthalate (PET) substrate was investigated via outer/inner bending, twisting, stretching, and adhesion tests. A PEDOT:PSS layer was inserted between ITO and PET substrate as a buffer layer to improve the flexibility and electrical properties. When a PEDOT:PSS layer was inserted, the sheet resistance of the 20 nm-thick ITO film decreased from 270 惟/square to 57 惟/square. Notably, the ITO/PEDOT:PSS hybrid electrode had a constant resistance change (螖R/R₀) within an outer and inner bending radius of 3 mm. The bending fatigue test showed that the ITO/PEDOT:PSS hybrid electrode can withstand 10,000 bending cycles. Furthermore, the stretched ITO/PEDOT:PSS hybrid electrode showed a fairly constant resistance change up to 4%, which is more stable than the resistance change of the ITO electrode. The ITO/PEDOT:PSS electrode also shows good adhesion strength. The superior flexibility of the ITO/PEDOT:PSS hybrid electrode is attributed to the existence of a flexible PEDOT:PSS layer. This indicates that the hybridization of an ITO and PEDOT:PSS layer is a promising electrode scheme for next-generation flexible transparent electrodes.