研究目的
Investigating the ferroelectric, photoelectric, and photovoltaic properties of pure (Bi0.5Na0.5)TiO3 (BNT) and 0.3(Bi0.5Na0.5)TiO3-0.7BiFeO3 (0.3BNT-0.7BFO) ceramics under visible light illumination.
研究成果
The study demonstrates that pure BNT exhibits a ferroelectric photovoltaic effect under visible light illumination, while 0.3BNT-0.7BFO shows a strain-induced flexo-photovoltaic effect. The differences in photovoltaic behavior are attributed to distinctions in domain structures and local strain states. These findings contribute to the understanding of photovoltaic mechanisms and suggest potential applications in multifunctional photoelectric devices.
研究不足
The study is limited by the specific compositions of BNT and 0.3BNT-0.7BFO ceramics investigated and the conditions under which the measurements were taken. The potential for optimization in material composition and experimental conditions to enhance photovoltaic effects is noted.
1：Experimental Design and Method Selection:
The study involves the preparation of BNT and 0.3BNT-0.7BFO ceramics via conventional solid-state reaction methods, followed by characterization of their phase structures, morphologies, and microstructures using XRD, SEM, and TEM. The ferroelectric properties were measured using a ferroelectric test system and PFM. Photoelectric and photovoltaic properties were measured using a high precision electrometer under various light conditions.
2：3BNT-7BFO ceramics via conventional solid-state reaction methods, followed by characterization of their phase structures, morphologies, and microstructures using XRD, SEM, and TEM. The ferroelectric properties were measured using a ferroelectric test system and PFM. Photoelectric and photovoltaic properties were measured using a high precision electrometer under various light conditions.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The samples were prepared from stoichiometrically weighed starting materials (Bi2O3, Na2CO3, TiO2, and Fe2O3) and processed through calcination, milling, and sintering.
3：List of Experimental Equipment and Materials:
Equipment includes XRD (Rigaku, MinFlex 600), SEM (SU-8010), TEM (Tecnai F20), UV-VIS-NIR spectrometer (PerkinElmer Lambda 950), ferroelectric test system (TF Analyzer 2000E), PFM (SPA 400), and high precision electrometer (Keithley 6517B). Materials include Bi2O3, Na2CO3, TiO2, Fe2O3, and polyvinyl alcohol.
4：Experimental Procedures and Operational Workflow:
The ceramics were prepared, characterized, and then subjected to ferroelectric and photovoltaic measurements under controlled conditions.
5：Data Analysis Methods:
Data analysis involved geometric phase analysis (GPA) on HRTEM images, UV-visible absorption spectra analysis, and evaluation of photovoltaic performance under various light intensities and wavelengths.
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