研究目的
Investigating the enhanced stability of α-phase FAPbI3 perovskite solar cells by insertion of 2D (PEA)2PbI4 nanosheets.
研究成果
The inclusion of 2D (PEA)2PbI4 nanosheets in the 3D Cs0.1FA0.9PbI3 perovskite layer effectively prevents the transformation of α-FAPbI3 to δ-FAPbI3, leading to higher quality perovskite thin films with enhanced photovoltaic performance and stability. The devices achieved a high power conversion efficiency of 20.44% and retained 82% of their initial efficiency after 800 hours of aging.
研究不足
The study focuses on the stability and efficiency of MA-free perovskite solar cells but does not extensively explore the scalability of the fabrication process or the long-term stability under varying environmental conditions beyond controlled laboratory settings.
1：Experimental Design and Method Selection:
The study employed a modified one-step method for fabricating perovskite thin films, incorporating 2D (PEA)2PbI4 nanosheets into the 3D Cs0.1FA0.9PbI3 perovskite layer to prevent phase transformation and enhance stability.
2：1FA9PbI3 perovskite layer to prevent phase transformation and enhance stability.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Perovskite layers were prepared with different concentrations of (PEA)2PbI4 nanosheets to investigate their impact on film quality and device performance.
3：List of Experimental Equipment and Materials:
X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis absorption spectroscopy, photoluminescence (PL) spectroscopy, and time-resolved PL (TRPL) were used for characterization.
4：Experimental Procedures and Operational Workflow:
The fabrication involved spin-coating perovskite solution followed by anti-solvent treatment with or without (PEA)2PbI4 nanosheets, thermal annealing, and device assembly.
5：Data Analysis Methods:
Space charge-limited current (SCLC) technique was used to analyze trap-state density, and photovoltaic performance was evaluated through J-V curves and incident photon-to-current conversion efficiency (IPCE) measurements.
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