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Enhancement of photoelectrochemical performance of CdSe sensitized seeded TiO2 films

  • F. Joudi
  • W. Chakhari
  • R. Ouertani
  • J. Ben Naceur
  • R. Chtourou
Article
  • 45 Downloads

Abstract

In this work, we highlight the effect of TiO2 seed layer (SL) on the photoelectrochemical performances of CdSe/TiO2 photoanodes (PAs). TiO2 thin films were prepared by spin coating starting from a sol gel solution containing TiO2 nanopowder, then sensitized with electrodeposited CdSe nanoparticles. Structural, optical and photoelectrochemical properties of the CdSe/TiO2 PAs with and without the SL were investigated. Charge accumulation processes and charge transfer characteristics were identified by electrochemical impedance spectroscopy. The introduction of the compact TiO2 SL was found to significantly increase the electron transport. The photocurrent density produced by the CdSe/TiO2/SL PA reached 0.95 mA/cm2, about two times higher than that performed by the CdSe/TiO2 PAs. This enhancement might be attributed to a substantial decrease of the leakage current induced by a better crystallization of TiO2 thin films as well as a higher sensitizing effect of the CdSe nanoparticles.

Abbreviations

PEC

Photoelectrochemical

SL

Seed layer

PAs

Photoanodes

FTO

Fluorine-doped tin oxide

ITO

Indium-doped tin oxide

XRD

X-ray diffraction

SEM

Scanning electron microscope

LSV

Linear sweep voltammogram

Jsc

Short-circuit current density

J–V

Photocurrent density–voltage

VOC

Open circuit voltage

FF

Fill factor

η

Energy conversion efficiency

J–t

Photocurrent–time

EIS

Electrochemical impedance spectroscopy

Notes

Acknowledgements

This work is supported by the Ministry of Higher Education and Scientific Research of Tunisia.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • F. Joudi
    • 1
    • 3
  • W. Chakhari
    • 1
    • 3
  • R. Ouertani
    • 2
  • J. Ben Naceur
    • 1
  • R. Chtourou
    • 1
  1. 1.Laboratoire de Nanomatériaux et Systèmes pour les Energies RenouvelablesCentre de Recherches et des Technologies de l’EnergieHammam LifTunisia
  2. 2.Laboratoire de photovoltaiqueCentre de Recherches et des Technologies de l’EnergieHammam LifTunisia
  3. 3.Faculté des sciences de TunisUniversité Tunis-El ManarTunisTunisia

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