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A maskless synthesis of TiO2-nanofiber-based hierarchical structures for solid-state dye-sensitized solar cells with improved performance

Lookup NU author(s): Dr Stevin Pramana

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

TiO2 hierarchical nanostructures with secondary growth have been successfully synthesized on electrospun nanofibers via surfactant-free hydrothermal route. The effect of hydrothermal reaction time on the secondary nanostructures has been studied. The synthesized nanostructures comprise electrospun nanofibers which are polycrystalline with anatase phase and have single crystalline, rutile TiO2 nanorod-like structures growing on them. These secondary nanostructures have a preferential growth direction [110]. UV-vis spectroscopy measurements point to better dye loading capability and incident photon to current conversion efficiency spectra show enhanced light harvesting of the synthesized hierarchical structures. Concomitantly, the dye molecules act as spacers between the conduction band electrons of TiO2 and holes in the hole transporting medium, i.e., spiro-OMeTAD and thus enhance open circuit voltage. The charge transport and recombination effects are characterized by electrochemical impedance spectroscopy measurements. As a result of improved light harvesting, dye loading, and reduced recombination losses, the hierarchical nanofibers yield 2.14% electrochemical conversion efficiency which is 50% higher than the efficiency obtained by plain nanofibers. © 2014 Sabba et al.; licensee Springer.


Publication metadata

Author(s): Sabba D, Agarwala S, Pramana SS, Mhaisalkar S

Publication type: Article

Publication status: Published

Journal: Nanoscale Research Letters

Year: 2014

Volume: 9

Issue: 1

Online publication date: 10/01/2014

Acceptance date: 26/12/2013

Date deposited: 06/04/2017

ISSN (print): 1931-7573

ISSN (electronic): 1556-276X

Publisher: SpringerOpen

URL: https://doi.org/10.1186/1556-276X-9-14

DOI: 10.1186/1556-276X-9-14


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