Electrostatic blocking barrier as an effective strategy to inhibit electron recombination in DSSCs

Guimarães, Robson Raphael; Parussulo, André L.A.; Matias, Tiago A.; Toma, Henrique E.; Araki, Koji

doi:10.1016/j.electacta.2017.09.096

Cited by 24 publications

(19 citation statements)

References 27 publications

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“…The curves j-V provide all the photovoltaic parameters to calculate the energy conversion efficiency (ƞ), using Equation 2, where j sc corresponds to the short-circuit current (when the potential is zero), V oc the open circuit potential (when the current is zero), P in the incident power, and FF the fill factor. 7, 4,13 Table 1 shows the photoelectrochemical parameters extracted from the curves 6 ƞ (%) = In the Table 1 the result could be suggested, since as observed in the UV VIS spectra, the dyes analyzed here presented the characteristic of absorbing energy only in the visible light region. 8 Regarding the fill factor, it can be seen that the highest value found was FF = 0.56 for the Curcuma Longa dye.…”

Section: Resultsmentioning

confidence: 78%

“…The intermediate arc is the most studied in solar cells because it provides information about the TiO 2 / dye / electrolyte interface. 4 It is verified that for the system produced with the beta dye, there is an enormous resistance related to the passage of the electron through the external circuit, until finding the counter electrode, making difficult the formation of the electric current, as evidenced by the curves of j-V, where a value of ɳ= 0.16 % was found to energy conversion. 30 For the cell produced with the Curcuma Longa dye, the resistance at the anode interface was much lower than the beta dye, consequently generating cells with better current density, due the less resistance to current flow.…”

Section: Resultsmentioning

confidence: 93%

“…Dye-sensitized systems (DSSC) have been developed by Gratzel in 1991, and have been studied by researches of the whole world, due good efficiency. 3,4,5 The operation of the DSSC (Fig -1) is based in sunlight absorption by the photo sensitizer, which gets excited and injects electrons from the photoexcited state into the conduction band of semiconductor. 6 To complete the circuit, the dye must be regenerated by electron transfer from a redox species in a solution which is the reduced at the counter electrode.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Study of Curcuma Longa and Beta Extracted Dye Applied on Dye Sensitized Solar Cells

Ayoub¹,

Tractz²,

Dias³

et al. 2019

Rev. Virtual Quim.

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Estudo Comparativo Corante Extraído de Curcuma Longa e Beta Aplicado em Células Solares Sensibilizadas por Corantes Resumo: As células solares sensibilizadas por corante (DSSC) mostraram vantagens, como um método alternativo para reduzir a emissão de gases poluentes e baixos custos de produção. Alguns corantes naturais podem ser aplicados em DSSC, uma vez que possuem moléculas fotossensíveis, como flavonóides e terpenos, presentes na composição cromofórica e nos grupos auxocromos. Esses grupos podem absorver energia do sol gerando células com diferentes parâmetros, devido à estrutura química da molécula. O objetivo deste trabalho é produzir e caracterizar células solares de TiO 2 , com corantes naturais extraídos de Curcuma Longa e Beta, verificando quais apresentam melhores parâmetros fotoquímicos. As técnicas de caracterização empregadas foram: Espectroscopia UV-VIS, Potencial Circuito Aberto em função do tempo (Voc), Fotocronoamperometria (j-t), Curvas de densidade de corrente em função do potencial (j-V) e Espectroscopia de Impedância Eletroquímica (EIS). Os resultados indicaram que a célula produzida com Curcuma Longa é menos resistente ao fluxo de corrente e com maior revestimento sob a superfície do TiO 2 , com parâmetros fotovoltaicos de j = 0,860 mA cm-2 ; Voc = 0,535 V; FF = 0,560 e ɳ = 0,260 %.

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Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparative Study of Curcuma Longa and Beta Extracted Dye Applied on Dye Sensitized Solar Cells

Ayoub¹,

Tractz²,

Dias³

et al. 2019

Rev. Virtual Quim.

View full text Add to dashboard Cite

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“…Muniz et al 22 proved that TiO 2 anatase presented a higher clustering density and higher surface area per unit volume in relation to the rutile phase and the brookite phase, increasing its use as an electron acceptor. 23,4 In order to evaluate the cell response to the incident light, EIS measurements were performed for the devices in the presence of light, and the results are presented in the Nyquist diagram ( Figure 7).…”

Section: Figures 4 and 5 Shows The X-ray Diffractograms Of Tio 2 And mentioning

confidence: 99%

COMPARATIVE STUDY OF TiO2 AND ZnO APPLICATION IN HYBRID SOLAR CELLS USING COPOLYMER P3OT/P3MT

Larsson

Tractz

Maia

et al. 2019

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Hybrid inorganic-organic solar cells are an attractive alternative energy source because of their low-cost production and ability to make use of a large amount of solar radiation available. This work aims to evaluate different solar cells composed of TiO 2 and ZnO with P3OT/P3MT copolymer. Layers of semiconductor oxides were deposited on transparent fluorine-doped tin oxide (FTO) by spin coating and adsorption in the polymer solution. X-ray diffraction (XRD), scanning electron microscopy (SEM), were used to characterize the fabricated semiconductors and curves of current density vs. potential (j-V), photochronoamperometry (j-t) and electrochemical impedance spectroscopy (EIS) were used to determine their electrical characteristics. The XRD analyses confirmed the crystalline nature of the oxide materials. SEM micrographs showed the spherical morphology of ZnO and the poorly defined agglomerate morphology of TiO 2. The electrochemical measurements proved that the best cell was produced with P3OT/P3MT copolymer and TiO 2 , owing to its lower charge transfer resistance, with the following photovoltaic parameters: V oc = 0.615 V ± 0.004, j sc = 1.545 mA cm-2 ± 0.240, FF = 0.637 ± 0.003, and η = 0.617% ± 0.117.

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“…Most of the high‐efficiency DSSC systems are based on liquid electrolytes . However, problems associated with liquid electrolytes are leakage, flammability, and other electrochemical stability issues.…”

Section: Introductionmentioning

confidence: 99%

Characterization of PMA–TPAI and PVAc–TPAI solid polymer electrolytes and application in dye‐sensitized solar cell

Azmar

Rozana

Winie

2018

J of Applied Polymer Sci

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Poly(methyl acrylate) (PMA)-tetrapropylammonium iodide (TPAI) and poly(vinyl acetate) (PVAc)-TPAI solid polymer electrolytes were prepared by solution casting method. DSC, FTIR, and conductivity results are reported. TPAI interacts with PMA and PVAc to form PMA-TPAI and PVAc-TPAI complexes. Formation of PMA-TPAI and PVAc-TPAI complexes are supported by the DSC and FTIR studies. Linear relationship for the dependence of glass-transition temperature, T g , on salt concentration allows the estimation of the complexation extent between polymer and salt. A greater extent of complexation for PMA with TPAI is observed and correlated with the FTIR results. The conductivities achieved at 15 wt % of TPAI for PMA and PVAc are 2.6 × 10 −11 and 1.3 × 10 −11 S cm −1 , respectively. Higher dielectric constant and lower T g of PMA result in higher number and mobility of ions, which lead to higher conductivity in accordance with σ = enμ. All-solid-state dye-sensitized solar cells (DSSCs) were assembled with PMA-TPAI and PVAc-TPAI electrolytes. DSSC efficiencies achieved for PMA and PVAc are 2.41% and 2.05%, respectively. Better performance of DSSC with PMA electrolyte is attributed to higher short-circuit current density, J sc , and lower recombination loss. Lower J sc , higher recombination loss, and degradation of counter electrode are the reasons for DSSC degradation.

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Electrostatic blocking barrier as an effective strategy to inhibit electron recombination in DSSCs

Cited by 24 publications

References 27 publications

Comparative Study of Curcuma Longa and Beta Extracted Dye Applied on Dye Sensitized Solar Cells

Comparative Study of Curcuma Longa and Beta Extracted Dye Applied on Dye Sensitized Solar Cells

COMPARATIVE STUDY OF TiO2 AND ZnO APPLICATION IN HYBRID SOLAR CELLS USING COPOLYMER P3OT/P3MT

Characterization of PMA–TPAI and PVAc–TPAI solid polymer electrolytes and application in dye‐sensitized solar cell

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