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Enhancing the Efficiency of DSSCs by the Modification of TiO 2 Photoanodes using N, F and S, co-doped Graphene Quantum Dots
- Source :
- Electrochimica Acta. 242:337-343
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
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 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 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.
- Subjects :
- Photoluminescence
Materials science
business.industry
Graphene
General Chemical Engineering
Fermi level
Doping
Energy conversion efficiency
Quantum yield
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
law.invention
Dye-sensitized solar cell
symbols.namesake
law
Quantum dot
Electrochemistry
symbols
Optoelectronics
0210 nano-technology
business
Subjects
Details
- ISSN :
- 00134686
- Volume :
- 242
- Database :
- OpenAIRE
- Journal :
- Electrochimica Acta
- Accession number :
- edsair.doi...........7686236b8914442210d131ee65e23cad