Scalable and surfactant-free process for single-walled carbon nanotube based transparent conductive thin films via layer-by-layer assembly

Ching Yuan Su, Ang Yu Lu, Yi Ling Chen, Ching Yen Wei, Cheng Hui Weng, Pen Cheng Wang, Fu Rong Chen, Keh Chyang Leou, Chuen Horng Tsai

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

In this paper, we demonstrate a surfactant-free method to fabricate large-area SWCNT film based transparent conductive (SWCNT-TC) electrodes with uniform properties (optical and electrical) via the fusion of layer-by-layer (LBL) deposition. The optical and electrical properties of SWCNT-TC electrodes are comparable to those of typical metal oxide electrodes after the SWCNT-TC electrode is further treated by acid (HNO3/H2SO 4) and SOCl2. The sheet resistance of SWCNT-TC electrodes is measured to be ∼34.9 Ω/sq and the transmittance is ∼71.9% at 550 nm. Moreover, our work addressed a long-term argument regarding whether the improvement in conductivity of SWCNT-TC electrodes after acid treatment is, as was proposed, attributed to sufficient removal of surfactant; our result implicitly indicates that the improved conductivity may be due to the down-shifting of the Fermi level induced by the charge transfer between the SWCNTs and doped species after acid treatment. In addition, the high quality (I(D)/I(G) < 1) and surfactant-free SWCNT-TC electrode shows higher performance in an organic photovoltaic (OPV) device as compared with those of surfactant-contained SWCNT-TC electrodes made by other processes.

Original languageEnglish
Pages (from-to)11588-11594
Number of pages7
JournalJournal of Physical Chemistry C
Volume114
Issue number26
DOIs
StatePublished - 8 Jul 2010

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