Abstract
In this study we fabricated novel transparent composite electrodes based on multi-walled carbon nanotubes (MWCNTs) and sodium dodecyl sulfate (SDS). The target optoelectronic properties of the flexible composite films are ± 100 Ω/sq at 77% transmission of 550 nm light based on the properties of indium tin oxide (ITO) films on poly-ethylene terephthalate (PET). The optical properties of the MWCNTs composite thin films were measured in the UV-Vis and IR regions. The corresponding band-gap of composite films was 3.82 eV and complementary to the band-gaps’ of dye-sensitized and organic solar cell components. The band-gaps of films deposited between 30 minutes and 60 minutes were tunable. Composite films over PET had tunable transparency of 550 nm light from 85% to 83% to 80%. The respective resistivities were 1141 Ω/sq, 378 Ω/sq and 110 Ω/sq with an inverse exponential relationship between transparency and resistivity. Preferential deposition of MWCNT composites was demonstrated by low coverage on glass substrates and dense coverage on PET substrates. The roughness (Ra) of the MWCNT composites over PET was 20.40 nm as compared to 0.70 nm for indium tin oxide (ITO) depositions over glass.
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