Improved performance of dye-sensitized solar cell based on TiO 2 photoanode with FTO glass and film both treated by TiCl 4

Li, Jinlun; Zhang, Haiyan; Wang, Wenguang; Qian, Yannan; Li, Zhenghui

doi:10.1016/j.physb.2016.07.021

Cited by 17 publications

(11 citation statements)

References 36 publications

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“…The second is the explicit inclusion of the TiO 2 (e – ) lifetime as a function of the number of injected electrons and hence the incident photon flux, as highlighted by τ(Φ). The absolute value of V OC is dependent on many experimental variables, such as surface pretreatments − and electrolyte additives; − however, the derivative with respect to the incident photon flux provides direct information on the reaction order according to eq . To test the validity of eq , DSSCs comprised of an N719 (the dicarboxyate salt of cis -Ru(dcb) 2 (NCS) 2 , where dcb is 4,4′-(CO 2 H) 2 -2,2′-bipyridine) sensitized mesoporous TiO 2 thin film with a 100 mM LiClO 4 , 250 mM TBAI, where TBA + is tetrabutylammonium, and 50 mM I 2 CH 3 CN electrolyte were constructed. The DSSCs were light-soaked under 1 sun illumination until the i – V characteristics of the cell were time-insensitive, typically 15–30 min.…”

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confidence: 99%

Evidence for First-Order Charge Recombination in Dye-Sensitized Solar Cells

Barr

Meyer

2017

ACS Energy Lett.

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Charge recombination between electrons injected into TiO2 (TiO2(e–)s) and acceptors at the dye-sensitized electrolyte interface have been quantified by measurement of the open-circuit photovoltage, V OC, as a function of the incident photon flux. Literature reports indicate that the order of the reaction with respect to TiO2(e–)s is less than unity, typically 0.5–0.85. Herein, an alternative model is proposed and tested that incorporates a characteristic temperature T 0 to model the density of acceptor states and photon flux-dependent TiO2(e–) lifetimes to account for shorter lifetimes at higher concentrations. Tests of this model with standard dye-sensitized solar cells based on the ditetrabutylammonium salt of cis-Ru(dcb)2(NCS)2 (N719, where dcb is 4,4′-(CO2H)2-2,2′-bipyridine) sensitizers in iodide/iodine acetonitrile electrolytes under 0.1–5 sun illumination revealed a reaction that is first-order in TiO2(e–)s with T 0 = 1150 K. The first-order reactivity is consistent with an underlying TiIV/III redox reaction, and the kinetic data under 1 sun illumination suggests recombination to molecular iodine, I2. Other implications for solar energy conversion and quantitative analysis of dye-sensitized solar cells are discussed.

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confidence: 99%

Evidence for First-Order Charge Recombination in Dye-Sensitized Solar Cells

Barr

Meyer

2017

ACS Energy Lett.

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“…The discontinuous homogeneity of C-N-TiO 2 films observed in Figures 5 and 8 might have induced short circuits during the solar cell energy conversion test, consequently resulting in low efficiency of 9% of C-N-TiO 2 compared to the reference. In comparison with the literature, the performance of C-N-TiO 2 solar cell with 9% conversion efficiency was much higher than the values reported in previous investigations [77][78][79]. Besides, Dong et al [80] used hydrothermal protocol to synthesize TiO 2 and Ag-doped TiO 2 (Ag-TiO 2 ) nanoparticles that were used in the dye-sensitized solar cell (DSSC) application.…”

Section: Discussionmentioning

confidence: 82%

Spin Coating Immobilisation of C-N-TiO2 Co-Doped Nano Catalyst on Glass and Application for Photocatalysis or as Electron Transporting Layer for Perovskite Solar Cells

et al. 2020

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Producing active thin films coated on supports resolves many issues of powder-based photo catalysis and energy harvesting. In this study, thin films of C-N-TiO2 were prepared by dynamic spin coating of C-N-TiO2 sol-gel on glass support. The effect of spin speed and sol gel precursor to solvent volume ratio on the film thickness was investigated. The C-N-TiO2-coated glass was annealed at 350 °C at a ramping rate of 10 °C/min with a holding time of 2 hours under a continuous flow of dry N2. The C-N-TiO2 films were characterised by profilometry analysis, light microscopy (LM), and scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS). The outcomes of this study proved that a spin coating technique followed by an annealing process to stabilise the layer could be used for immobilisation of the photo catalyst on glass. The exposure of C-N-TiO2 films to UV radiation induced photocatalytic decolouration of orange II (O.II) dye. The prepared C-N-TiO2 films showed a reasonable power conversion efficiency average (PCE of 9%) with respect to the reference device (15%). The study offers a feasible route for the engineering of C-N-TiO2 films applicable to wastewater remediation processes and energy harvesting in solar cell technologies.

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“…The reason is that the hydrolysis of TiCl4 produces the TiO2 layer, increasing the semiconductor's surface area [35,36]. The flow of electrons and dyes absorbed in semiconductors will increase with increased connection between particles and semiconductor surface area, pushing up the Jsc value and DSSC efficiency [36][37][38].…”

Section: Sem Testingmentioning

confidence: 99%