Effect of Cations in Coadsorbate on Charge Recombination and Conduction Band Edge Movement in Dye-Sensitized Solar Cells

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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Using Orbital Symmetry to Minimize Charge Recombination in Dye-Sensitized Solar Cells

Angewandte Chemie ◽

10.1002/ange.201205184 ◽

2012 ◽

Vol 125 (3) ◽

pp. 1007-1009 ◽

Cited By ~ 1

Author(s):

Emanuele Maggio ◽

Natalia Martsinovich ◽

Alessandro Troisi

Keyword(s):

Solar Cells ◽

Dye Sensitized Solar Cells ◽

Charge Recombination ◽

Orbital Symmetry ◽

Dye Sensitized ◽

Sensitized Solar Cells

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Bis-tridentate Ru(ii) sensitizers with a spatially encumbered 2,6-dipyrazolylpyridine ancillary ligand for dye-sensitized solar cells

RSC Advances ◽

10.1039/c7ra07379h ◽

2017 ◽

Vol 7 (67) ◽

pp. 42013-42023 ◽

Cited By ~ 7

Author(s):

Ting-Kuang Chang ◽

Yun Chi

Keyword(s):

Solar Cells ◽

Dye Sensitized Solar Cells ◽

Charge Recombination ◽

Ancillary Ligand ◽

Dye Sensitized ◽

Dye Loading ◽

Sensitized Solar Cells

The sensitizer TF-tBu_C3F7 has shown the highest overall efficiencies of JSC = 18.47 mA cm−2, VOC = 767 mV, FF = 0.71 and PCE = 10.05% under simulated one sun irradiation, due to the fine balance between dye loading and reduced charge recombination.

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New insights into electrolyte-component biased and transfer- and transport-limited charge recombination in dye-sensitized solar cells

RSC Advances ◽

10.1039/c5ra15658k ◽

2015 ◽

Vol 5 (103) ◽

pp. 84959-84966 ◽

Cited By ~ 5

Author(s):

Dong-Li Gao ◽

Yi Wang ◽

Ping Zhang ◽

Li-Min Fu ◽

Xi-Cheng Ai ◽

...

Keyword(s):

Solar Cells ◽

Electron Density ◽

Dye Sensitized Solar Cells ◽

Charge Recombination ◽

High Electron ◽

High Electron Density ◽

Dye Sensitized ◽

Electrolyte Component ◽

Sensitized Solar Cells

Charge recombination takes place, respectively, within the frameworks of transfer- and transport-limited recombination mechanisms, at low and high electron density.

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Effect of TiO2 surface treatment on electron transfer in dye-sensitized solar cells

Functional Materials Letters ◽

10.1142/s1793604722510122 ◽

2022 ◽

Author(s):

Suping Jia ◽

Tong Cheng ◽

Huinian Zhang ◽

Hao Wang ◽

Caihong Hao

Keyword(s):

Solar Cells ◽

Electron Transport ◽

High Efficiency ◽

Surface Defects ◽

Dye Sensitized Solar Cells ◽

Charge Recombination ◽

Defect States ◽

Transport Pathway ◽

Dye Sensitized ◽

Sensitized Solar Cells

Defect states in the TiO2 nanoparticles can cause severe charge recombination and poor electron-transport efficiency when used as a photoanode in dye-sensitized solar cells (DSSCs). Herein, we report a simple and practical way to passivate the surface defects of TiO2 through hydrothermal treating with acetic acid and H2SO4, introducing a high percentage of 101 facets and sulfonic acid functional groups on the TiO2 surface. A high efficiency of 8.12% has been achieved, which is 14% higher than that of untreated TiO2 under the same condition. EIS results prove that the multiacid-treated TiO2 can promote electron transport and reduce charge recombination at the interface of the TiO2 and electrolyte. This work provides an efficient approach to engineer the electron-transport pathway in DSSCs.

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