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Issue 5, 2012
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Plasma modified flexible bucky paper as an efficient counter electrode in dye sensitized solar cells

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Abstract

Platinum (Pt) -free counter electrodes (CEs) for dye sensitized solar cells (DSSCs) were developed using freestanding flexible single wall carbon nanotube (SWNT) films called bucky papers (BPs). BP was irradiated with microwave plasma, created using a mixture of Ar (1%) and H2 (99%) gases, for 2 h. Raman scattering measurements revealed that no significant defects were created in the SWNTs as a result of the treatment. Plasma-treated BP (P-BP) developed vertically oriented, micron sized, pillar-like structures on its surface, while its base was still a dense random mesh of SWNTs. This unique flexible film had a larger accessible surface area and better catalytic properties. The plasma treatment improved the efficiency of BP-based DSSCs from 2.44% to 4.02%, which is comparable to Pt thin film (4.08%). The P-BP based solar cell operated with an open circuit voltage of 0.73 V and a fill factor of 0.70. It also had much higher efficiencies than films of randomly oriented plasma treated SWNTs. Using electrochemical impedance spectroscopy, the charge transfer resistances of P-BP and Pt were found to be 1.46 and 1.73 Ω cm2, respectively.

Graphical abstract: Plasma modified flexible bucky paper as an efficient counter electrode in dye sensitized solar cells

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Publication details

The article was received on 21 Dec 2011, accepted on 17 Feb 2012 and first published on 20 Feb 2012


Article type: Paper
DOI: 10.1039/C2EE03519G
Citation: Energy Environ. Sci., 2012,5, 7001-7006
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    Plasma modified flexible bucky paper as an efficient counter electrode in dye sensitized solar cells

    S. Roy, R. Bajpai, A. K. Jena, P. Kumar, N. kulshrestha and D. S. Misra, Energy Environ. Sci., 2012, 5, 7001
    DOI: 10.1039/C2EE03519G

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