研究目的
Investigating the effects of surface modification of TiO2 photoanodes with Na2S on the photovoltaic properties of dye-sensitized solar cells (DSSCs).
研究成果
The Na2S modification of TiO2 photoanodes led to an improvement in both the Voc and FF of DSSCs, resulting in an increased power conversion efficiency. The negative shift of the TiO2 conduction band edge and the elevation in shunt resistance were identified as key factors contributing to the enhanced performance.
研究不足
The study focused on the effects of Na2S modification on TiO2 photoanodes for DSSCs, with potential limitations in the scalability of the modification process and the long-term stability of the modified photoanodes.
1：Experimental Design and Method Selection:
The study involved modifying TiO2 films by soaking them in an aqueous Na2S solution to prepare surface-modified photoanodes for DSSCs. The effects of this modification on the photovoltaic performance were studied.
2：Sample Selection and Data Sources:
Commercial products were used for DSSC fabrication, including F-doped SnO2 (FTO) glass, TiO2 paste, N719 dye, and iodide-based electrolytes.
3：List of Experimental Equipment and Materials:
Equipment included a VG Multilab ESCA 2000 apparatus for XPS and UPS analyses, a CompactStat potentiostat for photocurrent and voltage measurements, and a PEC-L01 solar simulator system.
4：Experimental Procedures and Operational Workflow:
TiO2 films were soaked in an aqueous Na2S solution, rinsed, dried, and then used to fabricate DSSCs. The photovoltaic properties were characterized under AM 1.5 illumination.
5：5 illumination. Data Analysis Methods:
5. Data Analysis Methods: UV–visible absorption and UPS valence band spectra were measured to estimate the band gap energy and valence band edge energy. Electrochemical impedance spectroscopy (EIS) was used to estimate electron lifetime and charge transport.
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F-doped SnO2 (FTO) glass
TCO22-7
Solaronix
Used as a substrate for the photoanode in DSSCs.
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TiO2 paste
Ti-nanoxide T/SP
Solaronix
Used for the photoanode in DSSCs.
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TiO2 paste for the scattering layer
Ti-nanoxide R/SP
Solaronix
Used for the scattering layer in DSSCs.
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N719 dye
Ruthenizer 535-bisTBA
Solaronix
Used as a sensitizer in DSSCs.
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Hot-melt adhesive
SX1170-60PF
Surlyn
Used in the fabrication of DSSCs.
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Iodide-based electrolytes
AN-50
Solaronix
Used as electrolytes in DSSCs.
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Platinum paste
PT-1
Dyesol-Timo JV
Used for the Pt counter electrode in DSSCs.
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Sodium sulfide
Sigma-Aldrich
Used as a surface modifier for TiO2 photoanodes.
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