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Linear bulk photovoltaic effect and phenomenological study in multi-phase co-existing ferroelectric system
Subhajit Pal1, Atal Bihari Swain1, Pranab Parimal Biswas1
1Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India.
Summary
Ferroelectric oxides with co-existing tetragonal and orthorhombic phases show unique photovoltaic effects. Researchers observed enhanced photovoltage near the transition temperature, offering insights for designing better photovoltaic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Ferroelectric materials with multiple co-existing phases can display unusual photovoltaic properties.
- Understanding these anomalous responses is crucial for developing advanced optoelectronic devices.
Purpose of the Study:
- To investigate the photovoltaic response of Ba1-(Bi0.5Li0.5)TiO3 ferroelectric oxides with co-existing tetragonal and orthorhombic phases.
- To elucidate the underlying mechanisms of the observed photovoltaic effects, including the linear bulk-photovoltaic effect.
Main Methods:
- Detailed photovoltaic measurements under 405 nm light illumination.
- Analysis of photocurrent dependence on light intensity and polarization.
- Temperature-dependent photovoltaic studies near the ferroelectric transition temperature (TC).
- Composition-dependent studies to verify a proposed phenomenological model.
Main Results:
- Experimental evidence for a linear bulk-photovoltaic effect was observed, indicated by linear and sinusoidal photocurrent dependencies.
- A two-fold enhancement in photovoltage was detected near the ferroelectric transition temperature (TC).
- The photovoltage behavior was found to correlate inversely with photoconductivity as a function of temperature.
Conclusions:
- The study confirms a linear relationship between the bulk-photovoltaic tensor component and photocurrent, validated by a phenomenological model.
- The findings provide key design parameters for engineering ferroelectric systems with improved photovoltaic characteristics for device applications.
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