Jump to main content
Jump to site search

Issue 44, 2013
Previous Article Next Article

Enhancement of power conversion efficiency of dye-sensitized solar cells by co-sensitization of zinc-porphyrin and thiocyanate-free ruthenium(ii)-terpyridine dyes and graphene modified TiO2 photoanode

Author affiliations

Abstract

A combination of a meso substituted zinc-porphyrin with two pyridyl groups and two benzoate groups at cis positions to each other (POR) with a mononuclear ruthenium(II) complex containing a 2,6-bis(1-methylbenzimidazol-2-yl)pyridine ligand and a carboxylic acid functionalized terpyridine ligand (SPS-G3) has been used as co-sensitizing system for the fabrication of dye-sensitized solar cells (DSSCs). The POR/SPS-G3 co-sensitized solar cell with a TiO2 photoanode displays enhanced short circuit current, open circuit voltage, and fill factor values (Jsc = 16.18 mA cm−2, Voc = 0.64 V, FF = 0.71, respectively), resulting in an overall power conversion efficiency (PCE) of 7.35%, which is superior to that for the DSSCs based on the individual dyes POR and SPS-G3. This is attributed to the improved light harvesting efficiency of the POR/SPS-G3 co-sensitizing system, which is evidenced by the incident photon-to-current efficiency (IPCE) spectrum of the co-sensitized solar cell. Further improvement of the PCE value of the co-sensitized solar cell (up to 8.15%) has been achieved by using a graphene modified TiO2 (G-TiO2) photoanode, instead of a pure TiO2 photoanode. Based on dark current measurements and electrochemical impedance spectra (EIS), the increased PCE value of the solar cell with the G-TiO2 photoanode can be attributed to suppression of charge recombination at the photoanode/dye/electrolyte interface and enhancement of electron transport in the photoanode. These results are in accordance with the longer electron lifetime exhibited by the G-TiO2 photoanode.

Graphical abstract: Enhancement of power conversion efficiency of dye-sensitized solar cells by co-sensitization of zinc-porphyrin and thiocyanate-free ruthenium(ii)-terpyridine dyes and graphene modified TiO2 photoanode

Back to tab navigation

Publication details

The article was received on 22 May 2013, accepted on 04 Sep 2013 and first published on 06 Sep 2013


Article type: Paper
DOI: 10.1039/C3RA42537A
RSC Adv., 2013,3, 22412-22420

  •   Request permissions

    Enhancement of power conversion efficiency of dye-sensitized solar cells by co-sensitization of zinc-porphyrin and thiocyanate-free ruthenium(II)-terpyridine dyes and graphene modified TiO2 photoanode

    G. D. Sharma, D. Daphnomili, K. S. V. Gupta, T. Gayathri, S. P. Singh, P. A. Angaridis, T. N. Kitsopoulos, D. Tasis and A. G. Coutsolelos, RSC Adv., 2013, 3, 22412
    DOI: 10.1039/C3RA42537A

Search articles by author

Spotlight

Advertisements