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Chemical, optical and photovoltaic properties of TiO2/reduced graphene oxide photoanodes sensitized with Roselle and N719 dyes for dye-sensitized solar cell application

Azimah Omar (HICoE, UMPEDAC, University of Malaya – City Campus, Kuala Lumpur, Malaysia)
Muhamad Saipul Fakir (HICoE, UMPEDAC, University of Malaya – City Campus, Kuala Lumpur, Malaysia)
Khairus Syifa Hamdan (HICoE, UMPEDAC, University of Malaya – City Campus, Kuala Lumpur, Malaysia)
Nurul Hidayah Rased (HICoE, UMPEDAC, University of Malaya – City Campus, Kuala Lumpur, Malaysia)
Nasrudin Abd. Rahim (HICoE, UMPEDAC, University of Malaya – City Campus, Kuala Lumpur, Malaysia and Renewable Energy Research Group, King Abdulaziz University, Jeddah, Saudi Arabia)

Pigment & Resin Technology

ISSN: 0369-9420

Article publication date: 8 April 2020

Issue publication date: 5 June 2020

256

Abstract

Purpose

The purpose of this paper is to investigate the chemical, optical and photovoltaic properties of titanium dioxide/reduced graphene oxide (TiO2/rGO) photoanodes immersed in natural Roselle and synthetic (N719) dyes for dye-sensitized solar cell (DSSC) application.

Design/methodology/approach

TiO2 mixed with rGO were doctor-bladed on fluorine doped tin oxide (FTO) glass substrate. The chemical and optical properties of TiO2/rGO photoanodes immersed in Roselle and N719 dyes were characterized using Fourier-transformed infrared (FTIR) and ultraviolet–visible (UV–vis) spectroscopies, respectively. The DSSC’s photovoltaic performances were tested using Visiontec Solar I-V tester at standard illumination of AM1.5 and irradiance level of 100 mW/cm2.

Findings

The presence of anthocyanin dye from Roselle flower was detected at 604 nm and 718 nm. TiO2/rGO+Roselle dye sample revealed the smallest energy gap of 0.17 eV for ease of electron movement from valence band to conduction band. The TiO2/rGO-based DSSC fabricated with Roselle dye had a power conversion efficiency, ƞ of 0.743 per cent higher than TiO2/rGO photoanode sensitized with N719 dye (0.334 per cent). The obtained J-V curves were analyzed by a single-diode model of Lambert W-function and manual optimization to determine the internal electrical parameters of the DSSC. The average and uncertainty values of Jsc and ƞ were evaluated at different Rsh range of 1362 Ω to 32 k Ω.

Research limitations/implications

Rs values were kept constant during optimization work.

Originality/value

New ideality factor of TiO2/rGO-based DSSC was re-determined around 0.9995.

Keywords

Citation

Omar, A., Fakir, M.S., Hamdan, K.S., Rased, N.H. and Rahim, N.A. (2020), "Chemical, optical and photovoltaic properties of TiO2/reduced graphene oxide photoanodes sensitized with Roselle and N719 dyes for dye-sensitized solar cell application", Pigment & Resin Technology, Vol. 49 No. 4, pp. 315-324. https://doi.org/10.1108/PRT-08-2019-0072

Publisher

:

Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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