Kundu, S. and Sarojinijeeva, P. and Karthick, R. and Anantharaj, G. and Bera, R. and Anandan, S. and Patra, A. and Ragupathy, P. and Selvaraj, M. and Jeyakumar, D. and Vijayamohanan, K. Pillai (2017) Enhancing the Efficiency of DSSCs by the Modification of TiO2 Photoanodes using N, F and S, co-doped Graphene Quantum Dots. Electrochim Acta, 242. pp. 337-343. ISSN 0013-4686

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Abstract

We report an enhanced power conversion efficiency (PCE) of 11.7%�0.2 and a fill factor (FF) of 71% for dye-sensitized solar cells (DSSC) with an active area of 0.16 cm2 after modifying the TiO2photoanode with size-selective (ca. 2 nm) N,F,S-codoped graphene quantum dots (NFS-GQDs) that exhibit a photo- luminescence quantum yield (PLQY) of 70%. An upward shift in the Fermi level has been observed, perhaps responsible for the improved performance along with the possibility of preventing the back electron transfer from TiO2. Mott Schottky analysis indicates a shift (52 mV)in the flat band potential, which is directly related to the Voc of the system. Detailed characterization (IPCE, TCSPC etc) indicates the important role of hetero atoms in facilitating the enhanced performance. Thus, our results suggest that the incorporation of size controlled, hetero atom doped GQDs can enhance the efficiency of DSSCs enabling more opto-electronic applications.

Item Type:	Article
Uncontrolled Keywords:	Dye sensitised solar cell (DSSC);Photoluminiscence quantum yield (PLQY);Power conversion efficiency (PCE);Electrochemical Impedance Spectroscopy(EIS); Graphene Quantum Dots (GQDs);Incident photon-to-current efficiency (IPCE);Time-correlated single-photon counting (TCSPC)
Subjects:	Solar Energy Electrochemical Materials Science Electrochemical Power Sources
Divisions:	UNSPECIFIED
Depositing User:	Dr. N Meyyappan
Date Deposited:	15 May 2019 09:42
Last Modified:	15 May 2019 09:42
URI:	http://cecri.csircentral.net/id/eprint/3227

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