研究目的
To enhance the performance of all-inorganic lead halide perovskite-based photodetectors by reducing surface defects and improving charge carrier mobility through a quasi core?shell technique.
研究成果
The quasi core?shell technique significantly reduces defects and the recombination of charge carriers in CsPbBr3 perovskite, leading to enhanced device performance. The photodetector showed a maximum specific detectivity of 1.7 × 1013 Jones with an ultra-high responsivity of 19 A W?1 at a low bias of ?1.5 V under 3 mW cm?2 405 nm illumination.
研究不足
The study focuses on FAI salt doping and does not conclusively rule out other salts that may produce similar results. The effect of FAI-salt doping on bulk polycrystalline film CsPbBr3 needs further detailed study.
1：Experimental Design and Method Selection:
A simple solution-processed route to synthesize quasi core?shell CsPbBr3-formamidinium iodide (FAI) colloidal quantum dots (CQDs) was employed. The ligand exchange was finely controlled to apply these CQDs as the active layer for photodetectors.
2：Sample Selection and Data Sources:
CsPbBr3 CQDs were synthesized and treated with FAI to form quasi core?shell structures. The presence of FAI on CsPbBr3 was confirmed by Fourier transform infrared spectroscopy.
3：List of Experimental Equipment and Materials:
The photodetector structure was ITO/ZnO (100 nm)/CsPbBr3 (150 nm)/Au. The performance was measured under 405 nm illumination.
4：Experimental Procedures and Operational Workflow:
The CsPbBr3 CQDs films were prepared layer-by-layer, and ligand-exchange was performed by dip-coating into FAI-ethyl acetate solution. The photodetector's performance was evaluated under various conditions.
5：Data Analysis Methods:
The performance of the photodetectors was assessed based on photosensitivity, responsivity, and specific detectivity. The crystallinity and surface defects of the CQDs were analyzed using XRD and SEM.
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