Polyiodides formation in solvent based Dye Sensitized Solar Cells under reverse bias stress

Agresti, Antonio; Pescetelli, Sara; Gatto, Emanuela; Venanzi, Mariano; Carlo, Aldo Di

doi:10.1016/j.jpowsour.2015.04.038

Cited by 26 publications

(8 citation statements)

References 56 publications

(51 reference statements)

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“… and . The anatase crystal form of both c‐TiO 2 /m‐TiO 2 and c‐TiO 2 /m‐TiO 2 /GO‐Li substrates was verified by means of resonance Raman spectroscopy (Figure S1, Supporting Information) . That, in combination with the absorbance measurements (Figure S2, Supporting Information), ensures a band gap of about 3.2 eV for both the analyzed substrates.…”

Section: Resultsmentioning

confidence: 68%

Efficiency and Stability Enhancement in Perovskite Solar Cells by Inserting Lithium‐Neutralized Graphene Oxide as Electron Transporting Layer

Agresti

Pescetelli

Cinà

et al. 2016

Adv Funct Materials

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187

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wileyonlinelibrary.comthe theoretical values, [ 9 ] further work is needed to increase the fi ll factor (FF) that today remains the bottleneck for the PCE enhancement. In this context, the optimization of interfaces between absorber, carrier transport layers, and electrode contact layers is crucial for an effi cient carrier transport. Thus, to improve the PCE of the PSCs, three main aspects need to be taken into account: the band alignment, the interface structure, and its passivation. [ 9 ] Furthermore, it must be taken into account that the injection times of electrons and holes in PSCs have been measured to be 0.4 and 0.6 ns, respectively, which are still orders of magnitude longer than the hot carrier cooling (or thermalization) time (≈0.4 ps). [ 10 ] Thus, a large amount of the converted photon energy is wasted in the thermalization process and in the carrier trapping. In this context, several materials have been proposed to facilitate electron/ hole extractions, including fullerene, [ 11 ] graphene, [ 12 ] or core/ shell metal nanoparticles. [ 13 ] Although graphene-based materials have been demonstrated to improve the performance and stability of organic and hybrid photovoltaic devices as recently reviewed by Singh and Nalwa, [ 14,15 ] a direct evidence is yet to be obtained regarding their role as a fast electron injector rather than just an electron trapping center. [ 16 ] In this work, to improve the electron extraction from the perovskite absorber into the mesoporous TiO 2 , an additional lithium-neutralized graphene oxide (GO-Li) layer as electron transporting Layer (ETL) is used. GO-Li has been already used as ETL in organic photovoltaic devices by Kakavelakis et al. [ 17 ] The authors demonstrated that the replacement of H atoms in the carboxyl groups of GO by Li atoms can effectively reduce the working function (WF) of GO from 4.9 to 4.3 ± 0.1 eV. Due to low electronegativity and low WF, Li atoms lose their valence electrons to the GO plane, and the resulting positive Li + induces dipoles. This transfer of charge from the metal to the GO leads to a shift in the Fermi level toward the vacuum and a consequent decrease in WF. [ 18 ] Since the WF of GO-Li displays a good match with the Lowest Unoccupied Molecular Orbital (LUMO) level of mesoporous TiO 2 , in this work a new effi cient perovskite solar cell structure is proposed which includes the GO-Li as an interlayer between the TiO 2 and the perovskite harvester. The resulting PSCs exhibit enhanced J SC and FF and reduced Effi ciency and Stability Enhancement in Perovskite Solar Cells by Inserting Lithium-Neutralized Graphene Oxide as Electron Transporting LayerAntonio Agresti , Sara Pescetelli , Lucio Cinà , Dimitrios Konios , George Kakavelakis , Emmanuel Kymakis , and

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Section: Resultsmentioning

confidence: 68%

Efficiency and Stability Enhancement in Perovskite Solar Cells by Inserting Lithium‐Neutralized Graphene Oxide as Electron Transporting Layer

Agresti

Pescetelli

Cinà

et al. 2016

Adv Funct Materials

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187

176

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“…The occurrence of spike in the complex impedance plots may be ascribed to the accumulation of charges at the electrolyte–electrode (blocking electrode) interface, which is commonly described as the double layer capacitive effect ( C dl ). 102 From the Nyquist plots, the bulk resistance, R b , was estimated and used to calculate ionic conductivity ( σ ) of the GPEs. Table 4 exhibits the thickness, t , R b and σ for the GPEs.…”

Section: Resultsmentioning

confidence: 99%

Electrocatalytic and structural properties and computational calculation of PAN-EC-PC-TPAI-I₂gel polymer electrolytes for dye sensitized solar cell application

et al. 2021

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“…Thse chages in TiO2 surface may be responsible of the small conduction band shift observed with impedance. In this context, the coordination between D + and triiodide ions is favored and the formation of Ru(III) intermediates finally leading to Ru(II)(CN) become a possible degradation-induced sub-product [4,35,36]. The interaction between dye and electrolyte accelerates the recombination reaction, that is associated to the decrease in recombination resistance for aged L-12 devices that slowsdown the device's dynamics reflected in a progressive photovoltaic performance reduction [37], as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Stability of dye-sensitized solar cells under extended thermal stress

Yadav

Ravishankar

Pescetelli

et al. 2017

Phys. Chem. Chem. Phys.

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Stability of dye-sensitized solar cells (DSCs) is a key issue and of great interest, since it could be a potential candidate for low cost energy production in order to satisfy the global energy demand. This work provides insight on stability of DSCs, assessed through accelerated aging test at 85 o C, followed by Raman spectroscopy and impedance spectroscopy (IS) measurements. The results from DSCs based on two ruthenium-based dyes Z907, Ru505 and two commercially available electrolytes such as high stability electrolyte (HSE) and solvent-free livion 12 (L-12). The least stable device composed of Z907/HSE retains 30% of its initial efficiency after 4700 hours of thermal stress at 85°C, while the remarkably stable cells Ru505/L-12 retains 96% of its initial efficiency with degradation rate of ~14%/1000 h and ~1%/1000 h respectively. The present findings show a solution to the degradation problem far beyond standard requirements and could generate strong interest in the photovoltaic industry.

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Polyiodides formation in solvent based Dye Sensitized Solar Cells under reverse bias stress

Cited by 26 publications

References 56 publications

Efficiency and Stability Enhancement in Perovskite Solar Cells by Inserting Lithium‐Neutralized Graphene Oxide as Electron Transporting Layer

Efficiency and Stability Enhancement in Perovskite Solar Cells by Inserting Lithium‐Neutralized Graphene Oxide as Electron Transporting Layer

Electrocatalytic and structural properties and computational calculation of PAN-EC-PC-TPAI-I₂gel polymer electrolytes for dye sensitized solar cell application

Stability of dye-sensitized solar cells under extended thermal stress

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Polyiodides formation in solvent based Dye Sensitized Solar Cells under reverse bias stress

Cited by 26 publications

References 56 publications

Efficiency and Stability Enhancement in Perovskite Solar Cells by Inserting Lithium‐Neutralized Graphene Oxide as Electron Transporting Layer

Efficiency and Stability Enhancement in Perovskite Solar Cells by Inserting Lithium‐Neutralized Graphene Oxide as Electron Transporting Layer

Electrocatalytic and structural properties and computational calculation of PAN-EC-PC-TPAI-I2gel polymer electrolytes for dye sensitized solar cell application

Stability of dye-sensitized solar cells under extended thermal stress

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Electrocatalytic and structural properties and computational calculation of PAN-EC-PC-TPAI-I₂gel polymer electrolytes for dye sensitized solar cell application