The role of the electronic structure and solvent in the dye-sensitized solar cells based on Zn-porphyrins: Theoretical study

Arkan, Foroogh; Izadyar, Mohammad; Nakhaeipour, Ali

doi:10.1016/j.energy.2016.08.027

Cited by 39 publications

(18 citation statements)

References 54 publications

(49 reference statements)

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“…where LHE is the light harvesting efficiency of dyes at a given wavelength(λ), η inj is the electron injection efficiency from excited dyes, and η coll is the electron collection efficiencies of the photoinjected electrons to the FTO electrode. The LHE is related to the light absorbance (A) of the dyes adsorbed on the ZnO surface, i.e., LHE = 1 − 10 −A [30,31]. Thus, the amount of adsorbed dyes should be measured to investigate the effects of the LHE on the J sc value.…”

Section: Photovoltaic Performance Of Dsscs With Zno Nanoflowers and Mmentioning

confidence: 99%

Photovoltaic Performance of Dye-Sensitized Solar Cells Containing ZnO Microrods

et al. 2019

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At an elevated temperature of 90 °C, a chemical bath deposition using an aqueous solution of Zn(NO3)2·6H2O and (CH2)6N4 resulted in the formation of both nanoflowers and microrods of ZnO on F-doped SnO2 glass with a seed layer. The nanoflowers and microrods were sensitized with dyes for application to the photoelectrodes of dye-sensitized solar cells (DSSCs). By extending the growth time of ZnO, the formation of nanoflowers was reduced and the formation of microrods favored. As the growth time was increased from 4 to 6 and then to 8 h, the open circuit voltage (Voc) values of the DSSCs were increased, whilst the short circuit current (Jsc) values varied only slightly. Changes in the dye-loading amount, dark current, and electrochemical impedance were monitored and they revealed that the increase in Voc was found to be due to a retardation of the charge recombination between photoinjected electrons and I3− ions and resulted from a reduction in the surface area of ZnO microrods. A reduced surface area decreased the dye contents adsorbed on the ZnO microrods, and thereby decreased the light harvesting efficiency (LHE). An increase in the electron collection efficiency attributed to the suppressed charge recombination counteracted the decreased LHE, resulting in comparable Jsc values regardless of the growth time.

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Section: Photovoltaic Performance Of Dsscs With Zno Nanoflowers and Mmentioning

confidence: 99%

Photovoltaic Performance of Dye-Sensitized Solar Cells Containing ZnO Microrods

et al. 2019

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“…To investigate the feasibility of the basic processes, such as dye regeneration and electron injection from the flavonoid derivatives to TiO 2 , and the adjustment of HOMO/LUMO energy levels of the studied natural dyes, semiconductors, and electrolyte were investigated by using the NBO analysis (Figure ).…”

Section: Resultsmentioning

confidence: 99%

“…Solar energy as the main renewable energy source provides energy for the living things on the earth through photosynthesis, which is used in portable power suppliers, wireless sensors, satellites, and photovoltaics …”

Section: Introductionmentioning

confidence: 99%

“…absorption spectra, charge transfer, flavonoid, natural dye, photovoltaic 1 | INTRODUCTION Solar energy as the main renewable energy source provides energy for the living things on the earth through photosynthesis, which is used in portable power suppliers, wireless sensors, satellites, and photovoltaics. [1,2] The first dye-sensitized solar cell (DSSC) was improved by O'Regan and Grätzel. [3] DSSCs are engaging due to their low-cost synthesis, working capability under the light conditions, and tunable transparency.…”

Section: Introductionmentioning

confidence: 99%

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Photovoltaic properties of the flavonoid‐based photosensitizers: Molecular‐scale perspective on the natural dye solar cells

Sabagh

Izadyar

Arkan

2020

Int J of Quantum Chemistry

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The molecular modification and the effects of the gas and water media on the ability of some flavonoids as the photosensitizers in the natural dye‐sensitized solar cells were theoretically investigated. According to the results, water increases the electrophilicity of the dyes and weakens the dye/TiO2 coupling, prohibiting the electron injection toward TiO2. A longer path for charge transfer and a less electron‐hole overlap for dihydroxychromens elevate the electron transfer more efficient than trihydroxychromen‐based flavonoids. However, the presence of water molecules within an increment in the OH groups in the flavonoid structures improves their spectroscopic properties, which is related to decrement in the gap of the frontier molecular orbitals and increment in the oscillator strength. Also, such favorable structural effects and influence of the water medium on the polarizability and excited‐state lifetime have emerged. According to the energy conversion efficiency, water is a favorable solvent for dihydroxychromen‐based flavonoids. Finally, different analyses on the structural geometries, excited‐state, lifetime within the kinetics, and dynamics of the photovoltaic processes were performed and discussed.

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“…where LHE(λ), η inj (λ), η coll (λ), and η reg are the light harvesting, electron injection, electron collection, and dye regeneration efficiencies, respectively; e is the elementary charge and Φ ph,AM1.5G is the photon flux in AM 1.5 G conditions of 100 mW/cm 2 [20,21]. The LHE is mostly affected by the light absorbance (A) of the adsorbed dyes, that is LHE = 1 − 10 −A [20,21]. To estimate the effects of LHE on the J sc reduction, we measured the amount of dyes adsorbed on the surface of the TiO 2 photoanode using the Beer-Lambert equation [22][23][24][25].…”

Section: Effects Of Surface Modification On J Scmentioning

confidence: 99%

Enhanced Power Conversion Efficiency of Dye-Sensitized Solar Cells by Band Edge Shift of TiO2 Photoanode

et al. 2020

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By simple soaking titanium dioxide (TiO2) films in an aqueous Na2S solution, we could prepare surface-modified photoanodes for application to dye-sensitized solar cells (DSSCs). An improvement in both the open-circuit voltage (Voc) and the fill factor (FF) was observed in the DSSC with the 5 min-soaked photoanode, compared with those of the control cell without any modification. The UV–visible absorbance spectra, UPS valence band spectra, and dark current measurements revealed that the Na2S modification led to the formation of anions on the TiO2 surface, and thereby shifted the conduction band edge of TiO2 in the negative (upward) direction, inducing an increase of 29 mV in the Voc. It was also found that the increased FF value in the surface-treated device was attributed to an elevation in the shunt resistance.

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The role of the electronic structure and solvent in the dye-sensitized solar cells based on Zn-porphyrins: Theoretical study

Cited by 39 publications

References 54 publications

Photovoltaic Performance of Dye-Sensitized Solar Cells Containing ZnO Microrods

Photovoltaic Performance of Dye-Sensitized Solar Cells Containing ZnO Microrods

Photovoltaic properties of the flavonoid‐based photosensitizers: Molecular‐scale perspective on the natural dye solar cells

Enhanced Power Conversion Efficiency of Dye-Sensitized Solar Cells by Band Edge Shift of TiO2 Photoanode

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