Journal
ELECTROCHIMICA ACTA
Volume 242, Issue -, Pages 337-343Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.05.024
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)
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Funding
- CSIR under TAPSUN program [FLEXISOLAR [NWP-54]]
- IUSSTF joint center for the student exchange program on the project 3D engineered electrodes for electrochemical energy storage [22-2012/2013-14]
- CSIR
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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 cm(2) after modifying the TiO(2)photoanode with size-selective (ca. 2 nm) N, F,S-codoped graphene quantum dots (NFS-GQDs) that exhibit a photoluminescence 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 V-oc 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. (C) 2017 Elsevier Ltd. All rights reserved.
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