研究目的
To systematically study the effect of green LPP (SrAl2O4: Eu3+) and its thickness on photoelectric behaviours of dye-sensitized solar cells (DSSCs) and to clarify the role of LPP layer on the photoelectric enhancements.
研究成果
The incorporation of LPP materials into DSSCs significantly enhances their PCE, primarily through back scattering and afterglow effects. The optimal LPP thickness was found to be about 25 μm, leading to a 24.3% improvement in PCE. The DSSCs also demonstrated the ability to generate power in dark conditions, showcasing the potential for all-weather solar cells.
研究不足
The study is limited by the insulativity of SrAl2O4: Eu3+ materials which may affect the fill factor of DSSCs. Additionally, the optimal thickness of LPP layer and its impact on device performance requires further optimization.
1：Experimental Design and Method Selection:
The study involved the design of P25 TiO2/SrAl2O4:Eu3+ long persistence phosphors (LPP) composite photoanodes with different LPP thicknesses. The methodology included the fabrication of composite photoanodes via blade combing with spin coating method, assembly of DSSCs, and performance testing under simulated sunlight and dark conditions.
2：Sample Selection and Data Sources:
Commercial P25 TiO2 powder and SrAl2O4: Eu3+ phosphor powder were used. The thickness of P25 layer was fixed at 12 μm, while LPP thicknesses were varied.
3：List of Experimental Equipment and Materials:
Equipment included a solar simulator, electrochemical workstation, FE-SEM, HR-TEM, XRD, UV-vis spectrophotometer, and PL spectrophotometer. Materials included P25 TiO2 powder, SrAl2O4: Eu3+ phosphor powder, FTO slides, dye N719, and Pt counter electrodes.
4：Experimental Procedures and Operational Workflow:
The procedure involved the preparation of P25 and LPP colloids, coating onto FTO slides, calcination, dye sensitization, assembly of DSSCs, and performance testing.
5：Data Analysis Methods:
Data analysis included J-V curve analysis, EIS analysis, UV-vis and PL spectra analysis, and IPCE measurements.
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