Journal of Materials Science

, Volume 53, Issue 17, pp 12441–12454 | Cite as

A facile electrochemical–hydrothermal synthesis and characterization of zinc oxide hierarchical structure for dye sensitized solar cell applications

Energy materials
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Abstract

A facile hierarchical microstructured ZnO thin films consisting of microspheres and nanorods were deposited on zinc oxide–titanium oxide (ZnO–TiO2) seeded FTO substrate by applying a two-step chemical techniques. At first, ZnO microsphere was electrochemically deposited on ZnO–TiO2 seeded FTO substrate by varying the deposition potentials in the range of − 1.1 to − 1.3 V. Followed by, the nanorods were hydrothermally grown on the optimized ZnO microsphere (ZnO electrodeposited at − 1.3 V). SEM displays the ZnO microsphere and nanorod for films deposited by electrodeposition of − 1.3 and hydrothermal technique, respectively. The suppression of ZnO growth along the (0001) orientation is noticed due to electrostatic absorption of citrate ions. TEM images confirm the hexagonal structure of microstructures and nanorods oriented along the lateral and c-axis growth direction, respectively. The appearance of high-intensity XRD peaks, Raman E2 (high) mode and UV emission confirms the hierarchical structure possessing a higher crystalline nature with lesser atomic defects. The hierarchical structure has high dye absorption, light absorption and scattering ability. The efficiency (η) of dye sensitized solar cells (DSSCs) consisting microsphere and hierarchical structures is found to be 3.13 and 4.64%, respectively. The DSSC consisting of hierarchical structure has the higher charge transfer recombination resistance (Rrec) and electron lifetime (τr) than other DSSC.

Notes

Acknowledgements

Author T.Marimuthu [Student ID: 201213-BSR-10183-2] wishes to thank University Grants Commission (UGC), New Delhi, for providing the financial support through UGC-BSR scheme to characterize the deposited micro- and nanostructures.

Compliance with ethical standards

Conflict of interest

The authors declared that they have no conflict of interest.

Supplementary material

10853_2018_2524_MOESM1_ESM.doc (2.1 mb)
Supplementary material 1 (DOC 2144 kb)

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Copyright information

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

Authors and Affiliations

  1. 1.Advanced Materials and Thin Film Lab, Department of PhysicsAlagappa UniversityKaraikudiIndia
  2. 2.Electrochemical Materials Science DivisionCSIR-Central Electrochemical Research InstituteKaraikudiIndia

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