研究目的
Investigating the non-stoichiometry induced switching behavior of ferroelectric photovoltaic effect in BaTiO3 ceramics.
研究成果
The study demonstrates that non-stoichiometry in BaTiO3 ceramics significantly affects the FPV performance, with a photocurrent direction switching behavior observed between Ti-excess and Ba-excess samples. The widening of grain boundaries in Ba-excess samples suppresses the intrinsic FPV effect, leading to the switching behavior. This provides direct evidence of the critical role of grain boundaries in the FPV effect and suggests potential for developing photovoltaic devices.
研究不足
The study is limited to BaTiO3 ceramics and the specific effects of non-stoichiometry on FPV performance. The findings may not be directly applicable to other ferroelectric materials or different preparation methods.
1：Experimental Design and Method Selection:
The study involved preparing non-stoichiometric BaTiO3 ceramic chips using the tape casting method to investigate the FPV effect.
2：Sample Selection and Data Sources:
Samples with Ba/Ti molar ratios ranging from
3：92 to 05 were prepared. List of Experimental Equipment and Materials:
X-ray diffraction analysis (Rigaku D/Max 2500), scanning electron microscope (SEM, Supra55, Zeiss), transmission electron microscope (TEM, F200, Jeol), high resistance meter (Model HP4339B, Agilent), and an electrochemical workstation (CHI600E, Chenhua) were used.
4：Experimental Procedures and Operational Workflow:
The samples were sintered at 1300–1325 °C for 30 min, coated with semi-transparent gold electrodes, and poled at room temperature before photovoltaic measurements.
5：Data Analysis Methods:
The photovoltaic properties were measured under laser light with a wavelength of 405 nm and intensity of 900 mW cm?2.
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Transmission electron microscope
F200
Jeol
Detailed microstructure analysis
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High resistance meter
HP4339B
Agilent
Testing the resistivity of the samples
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X-ray diffraction analysis
D/Max 2500
Rigaku
Identifying the phase structure of the samples
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Scanning electron microscope
Supra55
Zeiss
Observing the microstructures of the samples
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Electrochemical workstation
CHI600E
Chenhua
Measuring the photovoltaic properties
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