Fabrication and characterisation of graded index nanostructured TiO₂ compact layers for dye-sensitized solar cell / Mohd Hanapiah Abdullah

Abdullah, Mohd Hanapiah (2015) Fabrication and characterisation of graded index nanostructured TiO₂ compact layers for dye-sensitized solar cell / Mohd Hanapiah Abdullah. PhD thesis, Universiti Teknologi MARA.

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Abstract

A novel graded index nanostructured TiO₂ compact layer (arc- TiO₂) had been successfully deposited on Indium tin oxide (ITO) substrate by long-throw radiofrequency (RF) magnetron sputtering. The main aims of the arc-Ti0 2 compact layer were to serve as an antireflective compact layer that could reduce reflection losses, improve the photo-response of dye molecules, and prevent electron recombination in a dye-sensitized solar cell (DSSC) application. The employment of the TiO₂ compact layer in the DSSC was carefully optimised in term of RF power and thickness of the arc- TiO₂ film. Meanwhile, the desired characteristics were systematically investigated by means of UV-absorption spectra, incident photon to current efficiency (IPCE), open-circuit voltage decay (OCVD) and electrochemical impedance spectroscopy (EIS). The average transmittance of the IT0 /arc-Ti0 2 conducting substrate in the region from 400 nm to 1000 nm was approximately 85%. Corresponding average reflectance difference that was recorded in comparison to the bare ITO was 2.5 %. The red-shift behaviour of the transmittance-peak was actually due to the formation of a new hybrid band energy structure of 3.1 eV resulting from the tin (Sn) diffusion in the ITO film that shifted the absorption edge of the substrate. This had favoured the absorption characteristics and photo-response of N719 dye. Hence, the consistency of peaks between the transmittance spectra of the substrate with the corresponding IPCE spectra of the DSSC cell was improved…

Item Type: Thesis (PhD)
Creators:
CreatorsEmail
Abdullah, Mohd HanapiahUNSPECIFIED
Divisions: Faculty of Electrical Engineering
Item ID: 18325
Uncontrolled Keywords: Fabrication; Characterisation; Graded index; Nanostructured; Dye-sensitized solar cell
Last Modified: 27 Sep 2018 03:11
Depositing User: Staf Pendigitalan 5
URI: http://ir.uitm.edu.my/id/eprint/18325

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