Synergistically improved photovoltaic performances of dye-sensitized solar cells with metal-free organic cosensitizer and hybrid rGO-TiO2 photoanode
The photovoltaic performances of the dye-sensitized solar cells were considerably improved via comprising the device structure with the metal-free organic dye cosensitizer and the hybrid photoanode. The cosensitizer was composed of Eosin Y and Coumarin (EY-CM) dyes, and the hybrid photoanode was con...
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Published in | Dyes and pigments Vol. 209; p. 110892 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
01.02.2023
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Subjects | |
Online Access | Get full text |
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Summary: | The photovoltaic performances of the dye-sensitized solar cells were considerably improved via comprising the device structure with the metal-free organic dye cosensitizer and the hybrid photoanode. The cosensitizer was composed of Eosin Y and Coumarin (EY-CM) dyes, and the hybrid photoanode was constructed with the reduced graphene oxide-anchored titanium dioxide (rGO-TiO2) nanocomposites. Due to the aggregation of highly conductive rGO with semiconductive TiO2, the nanocomposites exhibited the decreased interfacial resistance; hence, the electron transport could be improved in the solid-state medium of the photoanode. Meanwhile, the cosensitization of EY-CM dyes could give rise to the increased photon absorbance at the wide spectral range; and their energy level alignment with rGO-TiO2 could lead to the enhanced hopping conduction of the photo-generated electrons. Furthermore, the configuration of rGO-TiO2/EY-CM allowed us to increase the electron injection lifetime, which could reduce the photocarrier recombination at the photoanode/sensitizer interface. Owing to the synergetic effects from both the rGO-TiO2 hybrid photoanode and the EY-CM cosensitizer, the fabricated dye-sensitized solar cell eventually showed the increased power conversion efficiency up to ∼6.14% under 1-Sun illumination with 100 mW/cm2.
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•The DSSCs were fabricated in the form of the hybrid photoanode/cosensitizer scheme.•The hybrid photoanode material of rGO-TiO2 was prepared by the hydrothermal method.•The cosensitizer was configured with double dyes of Eosin Y and Coumarin (EY-CM).•The rGO-TiO2/EY-CM scheme improved both electron lifetime and chemical capacitance.•The proposed scheme synergistically enhanced the photovoltaic performances. |
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ISSN: | 0143-7208 1873-3743 |
DOI: | 10.1016/j.dyepig.2022.110892 |