Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/xmlui/handle/100/14794
Title: Plasma modified flexible bucky paper as an efficient counter electrode in dye sensitized solar cells
Authors: ROY, S
BAJPAI, R
JENA, AK
KUMAR, P
KULSHRESTHA, N
MISRA, DS
Issue Date: 2012
Publisher: ROYAL SOC CHEMISTRY
Citation: ENERGY & ENVIRONMENTAL SCIENCE, 5(5)7001-7006
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 H-2 (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 Omega cm(2), respectively.
URI: http://dx.doi.org/10.1039/c2ee03519g
http://dspace.library.iitb.ac.in/jspui/handle/100/14794
ISSN: 1754-5692
1754-5706
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