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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
Published on: March 27, 2018
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Bulk Photovoltage Effect in Ferroelectric BaTiO3
Yong Liu1, Xun Wang1, Fengtao Fan1
1State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Dalian116023, China.
The Journal of Physical Chemistry Letters
|November 23, 2022
Summary
Investigating ferroelectric semiconductors for solar energy, this study distinguishes between shift and ballistic mechanisms. These mechanisms drive charge separation in opposite directions, offering new methods for understanding ferroelectric bulk photovoltage effects.
Area of Science:
- Materials Science
- Solid-State Physics
- Renewable Energy
Background:
- Ferroelectric semiconductors exhibit unique charge separation and photovoltaic effects, crucial for solar energy conversion.
- Understanding the bulk photovoltage effect, particularly utilizing nonthermalized carriers, is a key research area.
- Distinguishing between concurrent shift and ballistic mechanisms in ferroelectrics remains challenging.
Purpose of the Study:
- To develop an approach for differentiating surface photovoltage contributions from shift and ballistic mechanisms in ferroelectric semiconductors.
- To investigate the distinct effects of shift and ballistic mechanisms on charge separation in ferroelectrics.
- To provide methods for clarifying these mechanisms in ferroelectric materials.
Main Methods:
- Utilized a tetragonal ferroelectric Barium Titanate (BaTiO3) single crystal as a model system.
- Employed surface photovoltage measurements to analyze charge separation dynamics.
- Applied monochromatic superband illumination to probe the photovoltage response.
Main Results:
- Demonstrated that shift and ballistic mechanisms induce distinct effects on charge separation.
- Observed that both mechanisms contribute to charge separation in opposite directions.
- Quantified the charge separation magnitude for both mechanisms under specific illumination conditions.
Conclusions:
- The study successfully provides methods to distinguish between shift and ballistic mechanisms in ferroelectrics.
- The findings highlight the opposing yet comparable charge separation directions driven by these mechanisms.
- This research advances the understanding of bulk photovoltage effects in ferroelectric semiconductors for solar energy applications.
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