TiO2/Graphene Quantum Dots core-shell based photo anodes with TTIP treatment- A perspective way of enhancing the short circuit current

Solar Cell with TiO2-Graphene Quantum core/shell heterostructure synthesized by surface functionalization route is used for the present study. The structural properties of Graphene Quantum Dots (GQDs) coated TiO2 are confirmed by XRD, Raman, SEM, TEM and mapping analysis. Energies of the Highest Occ...

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Bibliographic Details
Published in:Solar energy materials and solar cells 2020-02, Vol.205, p.110239, Article 110239
Main Authors: Peter, I. John, Rajamanickam, N., Vijaya, S., Anandan, S., Ramachandran, K., Nithiananthi, P.
Format: Article
Language:English
Subjects:
Charge transfer
Circuits
Core-shell
Energy conversion efficiency
Graphene
Graphene quantum dots
Heterostructures
Mapping
Molecular orbitals
Photoanodes
Photovoltaic cells
Quantum dots
Short circuit currents
Solar cell
Solar cells
Spectroscopy
Surface functionalization
Titanium
Titanium dioxide
TTIP treatment
Vacuum
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Summary:Solar Cell with TiO2-Graphene Quantum core/shell heterostructure synthesized by surface functionalization route is used for the present study. The structural properties of Graphene Quantum Dots (GQDs) coated TiO2 are confirmed by XRD, Raman, SEM, TEM and mapping analysis. Energies of the Highest Occupied Molecular Orbital (HOMO) and Lowest Unoccupied Molecular Orbital (LUMO) of the GQDs against vacuum are determined using cyclic voltammetry technique and ultraviolet photo electron spectroscopy. When compared to the bare devices, J-V characteristics of the GQDs incorporated solar cell show an enhancement in efficiency around 38% and Jsc of 48%. Moreover, TiO2-GQD (TG 10) device pre and post treated with Titanium Tetra Isopropoxide (TTIP) shows the highest power conversion efficiency (PCE) of 5.1% which is ~65% enhancement when compared to untreated TG 10 based cell. This enhancement is due to higher light harvesting capacity, reduction in charge transfer resistance (Rct) at the interface, increase in life time of carriers and increase in charge transfer rates. •Surface functionalization route is used to make TiO2-GQDs core shell nanostructure.•Occurrence of GQDs† on TiO2 are confirmed from Raman and TEM‡ measurements.•Determination of HOMO and LUMO levels through Cyclic Voltametry technique.•TTIP treated TiO2-GQDs cell shows an enhancement in η~65% compared to untreated cell.
ISSN:0927-0248
1879-3398
DOI:10.1016/j.solmat.2019.110239