Abstract
The future of third generation Quantum dot sensitized solar cells (QDSSCs) can be optimistic if concerns of charge recombination and stability of cells can be worked upon. In this work, we report the role of Graphene materials in its different dimension in overcoming recombination and enhancing power conversion efficiency (PCE). Composite of Graphene oxide nanoribbons (GNRs) synthesized by oxidative unzipping of multi walled carbon nanotubes (MWCNTs) was used as an effective electron transport layer with TiO2 as photo anode in QDSSCs. The best performing TiO2-GNR showed a significant enhancement in PCE of 3.7% for CdS based quantum dots, apart from increased efficiency reported earlier. Investigation of design of anode material reveals that the enhanced surface area and active sites of partially conducting GNRs facilitated uniform deposition of Titania particles (TiO2) with less aggregation, excellent mobility, presence of organic functional group for anchor of TiO2, its 1D quasi structure add to enhanced electron transport (less resistance).
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