Journal
APPLIED SURFACE SCIENCE
Volume 424, Issue -, Pages 157-163Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.02.040
Keywords
Graphene nanomaterials; Flexible counter electrode; Dye-sensitized solar cells
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Funding
- National Science Centre [DEC-2013/09/B/ST8/02943]
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In this paper, new cost-effective platinum-free and flexible counter electrodes (CEs) for dye-sensitized solar cells (DSSCs) were reported. The ITO/PET CEs were produced using graphene films synthesized by CVD method and graphene flakes with addition PEDOT: PSS or PEDOT: PSS/PVP. The influence of mechanical stress arising from the bending of a flexible substrate on morphology, resistance of CEs as well as electrical properties of DSSCs was analyzed. The testing of these electrodes in DSSCs have demonstrated a power conversion efficiency of up to 3.95% to compare with the power conversion efficiency of 4.39% for DSSC with a standard Pt-based CE. After 100 bending cycles the electrodes demonstrated power conversion efficiency in range the 2.37-3.23% to compare with the power conversion efficiency of 2.08% for DSSC with a standard Pt-based CE. HRTEM investigation confirms the crystallographic structure of graphene. The obtained results demonstrate the possibility of replacing expensive platinum in DSCC by using graphene-based counter electrode. (C) 2017 Elsevier B.V. All rights reserved.
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