Effect of TiO2/reduced graphene oxide composite thin film as a blocking layer on the efficiency of dye-sensitized solar cells

Ramamoorthy, R.; Maheswari, Govindaraj; Antony, Maggie Dayana; Krishnan, Karthika; Velusamy, Eswaramoorthi; Anandan, Sambandam; Manoharan, Subbaiah; Rayar, Victor Williams

doi:10.1007/s10008-016-3437-7

Cited by 41 publications

(20 citation statements)

References 53 publications

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“…Figure 2 shows the FTIR spectra of the prepared photoanodes. The composition of TiO 2 /rGO for three samples has a broad absorption at wavenumber below 1,000 cm À1 which attributed to the Ti-O-Ti bond and Ti-O-C stretching vibration within the molecules (Raja et al, 2016;Ramamoorthy et al, 2017;Siddick et al, 2018). In addition, the peak at 1638 cm À1 , 1634 cm À1 and 1609 cm À1 represent the skeletal vibration of C = C and O-H (hydroxyl) bonding (Ding et al, 2015;Ramamoorthy et al, 2017) in TiO 2 /rGO, TiO 2 / rGO1Roselle and TiO 2 /rGO1N719 samples, respectively.…”

Section: Resultsmentioning

confidence: 98%

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

Omar

Fakir

Hamdan

et al. 2020

PRT

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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.

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Section: Resultsmentioning

confidence: 98%

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

Omar

Fakir

Hamdan

et al. 2020

PRT

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“…It was revealed that 120 °C rGO-TiO 2 nanocomposites obtained an ideal PCE result of 7.27% with Jsc of 15.74 A/cm 2 , Voc of 0.70 V, Jmp of 12.16 A/cm 2 , Vmp of 0.60, and FF of 0.66. Among these rGO-TiO 2 nanocomposite samples, 120 °C also achieved the highest Voc, which indicated the shifting energy band of sputtered TiO 2 with effective transferring of the photoinjected electrons from excited electron into the conduction band [ 47 ]. Furthermore, this impact would definitely benefit the 120 °C rGO-TiO 2 nanocomposite with the efficient electron lifetime and obtained the highest value of FF .…”

Section: Resultsmentioning

confidence: 99%

Influence of Sputtering Temperature of TiO2 Deposited onto Reduced Graphene Oxide Nanosheet as Efficient Photoanodes in Dye-Sensitized Solar Cells

et al. 2020

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Renewable solar energy is the key target to reduce fossil fuel consumption, minimize global warming issues, and indirectly minimizes erratic weather patterns. Herein, the authors synthesized an ultrathin reduced graphene oxide (rGO) nanosheet with ~47 nm via an improved Hummer’s method. The TiO2 was deposited by RF sputtering onto an rGO nanosheet with a variation of temperature to enhance the photogenerated electron or charge carrier mobility transport for the photoanode component. The morphology, topologies, element composition, crystallinity as well as dye-sensitized solar cells’ (DSSCs) performance were determined accordingly. Based on the results, FTIR spectra revealed presence of Ti-O-C bonds in every rGO-TiO2 nanocomposite samples at 800 cm–1. Besides, XRD revealed that a broad peak of anatase TiO2 was detected at ~25.4° after incorporation with the rGO. Furthermore, it was discovered that sputtering temperature of 120 °C created a desired power conversion energy (PCE) of 7.27% based on the J-V plot. Further increase of the sputtering temperature to 160 °C and 200 °C led to excessive TiO2 growth on the rGO nanosheet, thus resulting in undesirable charge recombination formed at the photoanode in the DSSC device.

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“…The photoluminescence spectra show a weak broad emission band with a maximum intensity at around 350–700 nm. Khalid et al [ 38 ] and Raja et al [ 39 ] reported that emission in that range is characteristic for direct (band–band) or indirect (via a band-gap state) recombination of excited electrons and holes [ 38 ]. The Nd-TiO 2 photocatalysts were characterized by a better separation ability of the photogenerated electrons and holes compared to pristine samples.…”

Section: Resultsmentioning

confidence: 99%

Influence of the preparation method on the photocatalytic activity of Nd-modified TiO₂

Parnicka

Mazierski

Grzyb

et al. 2018

Beilstein J. Nanotechnol.

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Nd-modified TiO2 photocatalysts have been obtained via hydrothermal (HT) and sol–hydrothermal (SHT) methods. The as-prepared samples were characterized by X-ray diffraction (XRD), BET surface area measurements, scanning electron microscopy (SEM), diffuse reflectance spectroscopy (DRS), luminescence spectroscopy and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of the synthesized samples was evaluated by the degradation of phenol in aqueous solution under irradiation with UV–vis (λ > 350 nm) and vis (λ > 420 nm) light, as well as by the degradation of gaseous toluene under irradiation with vis (λmax = 415 nm) light. It was found that Nd-modified TiO2 is an efficient photocatalyst for the degradation of phenol and toluene under visible light. XPS analysis revealed that the photocatalyst prepared via HT method contains a three-times higher amount of hydroxy groups at the surface layer and a two-times higher amount of surface defects than that obtained by the SHT method. The photocatalytic efficiency of phenol and toluene degradation under vis irradiation in the presence of 0.25% Nd-TiO2(HT) reached 0.62 and 3.36 μmol·dm−1·min−1, respectively. Photocatalytic activity tests in the presence of Nd-TiO2 and scavenger confirm that superoxide radicals were responsible for the visible light-induced degradation of the model pollutant in aqueous solution.

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Effect of TiO2/reduced graphene oxide composite thin film as a blocking layer on the efficiency of dye-sensitized solar cells

Cited by 41 publications

References 53 publications

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

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

Influence of Sputtering Temperature of TiO2 Deposited onto Reduced Graphene Oxide Nanosheet as Efficient Photoanodes in Dye-Sensitized Solar Cells

Influence of the preparation method on the photocatalytic activity of Nd-modified TiO₂

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Effect of TiO2/reduced graphene oxide composite thin film as a blocking layer on the efficiency of dye-sensitized solar cells

Cited by 41 publications

References 53 publications

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

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

Influence of Sputtering Temperature of TiO2 Deposited onto Reduced Graphene Oxide Nanosheet as Efficient Photoanodes in Dye-Sensitized Solar Cells

Influence of the preparation method on the photocatalytic activity of Nd-modified TiO2

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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

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

Influence of the preparation method on the photocatalytic activity of Nd-modified TiO₂