Highly conductive, transparent and metal-free electrodes with a PEDOT:PSS/SWNT bilayer for high-performance organic thin film transistors
- Authors
- Lee, Taehyung; Kwon, Woosung; Park, Minwoo
- Issue Date
- Apr-2019
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Carbon nanotube; PEDOT:PSS; Pentacene; Thin film transistor; Electrode
- Citation
- ORGANIC ELECTRONICS, v.67, pp 26 - 33
- Pages
- 8
- Journal Title
- ORGANIC ELECTRONICS
- Volume
- 67
- Start Page
- 26
- End Page
- 33
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/3707
- DOI
- 10.1016/j.orgel.2019.01.008
- ISSN
- 1566-1199
1878-5530
- Abstract
- Conducive organic materials including polymers, small molecules, and carbon nanotubes (CNTs) are a promising alternative to inorganic materials in electronic devices. Conventionally, organic electrodes employing CNTs are designed using functionalization of their surfaces or formation of nanocomposites with a conducive polymer. However, phase separation limits the concentration of CNTs in a polymer matrix, hindering the formation of highly dense CNT networks and leading to poor electrical conductivity. In this paper, we introduce bilayer electrodes comprising poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) and single-walled CNTs (SWNTs) chemically modified by HNO3 treatment. Impressive conductivities of 2432 and 2438 S cm(-1) are found for the SWNT/PEDOT:PSS (S/P) and PEDOT:PSS/SWNT (P/S) electrodes, respectively. Further, an increase in the work function of the electrodes after HNO3 treatment lowers the hole injection barrier, which facilitates hole injection from pentacene. The smooth surface of PEDOT:PSS also contributes to growth of large pentacene grains; consequently, the field-effect mobility of pentacene-based thin film transistors is 1.88 cm(2)V(-1)s(-1) when the P/S electrode is employed. The metal-free electrodes also exhibit a high optical transparency of 88.7%, which suggests that they have great potential for applications in optoelectronics.
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