研究目的
Investigating the effect of WO3 as an inorganic hole transport material for carbon electrodes to improve the stability of perovskite solar cells under ambient conditions.
研究成果
The incorporation of WO3 nanoparticles into carbon electrodes significantly improves the stability of perovskite solar cells under ambient conditions without compromising efficiency. The optimal concentration of WO3 was found to be 7.5%, achieving a maximum power conversion efficiency of 10.5% and maintaining ～80% of initial efficiency over 350 hours. Higher concentrations of WO3 (10%) further enhanced stability to 500 hours with minimal efficiency loss. This approach presents a viable pathway toward the development of stable, efficient perovskite solar cells for practical applications.
研究不足
The study is limited by the ambient fabrication conditions, which may introduce variability in the results. The stability tests were conducted over a limited period (up to 500 hours), and longer-term stability under various environmental conditions was not assessed.
1：Experimental Design and Method Selection:
The study involved the sequential fabrication of perovskite solar cells under ambient conditions using mesoporous TiO2/Al2O3/CH3NH3PbI3 layers, with WO3 nanoparticle-embedded carbon electrodes. Different concentrations of WO3 nanoparticles were tested to evaluate their impact on cell stability.
2：Sample Selection and Data Sources:
The samples were prepared with varying concentrations of WO3 (5%, 7.5%, and 10% by volume) in the carbon paste. The performance and stability of these cells were monitored under ambient conditions.
3：5%, and 10% by volume) in the carbon paste. The performance and stability of these cells were monitored under ambient conditions.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a solar simulator for performance testing, SEM for cross-sectional imaging, XRD for phase analysis, and EIS for transport properties analysis. Materials included TiO2, Al2O3, CH3NH3PbI3, WO3 nanoparticles, and carbon paste.
4：Experimental Procedures and Operational Workflow:
The fabrication process involved etching of FTO glass, deposition of compact and mesoporous TiO2 layers, lithium doping, Al2O3 layer deposition, screen printing of the carbon electrode with WO3, and perovskite layer formation. The cells were then characterized for performance and stability.
5：Data Analysis Methods:
The performance was evaluated using J-V characteristics, IPCE spectra, and EIS measurements. Stability was assessed by monitoring the cells under light illumination over time.
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