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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

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Published on: May 29, 2018

Tunable persistent photoresponse in reduced PMN-PT crystals.

M R Tolosa¹, J M Ferreyra¹, Manuel Villafuerte¹

¹Laboratorio de Física del Sólido, INFINOA (CONICET-UNT), Facultad de Ciencias Exactas y Tecnología, Universidad Nacional de Tucumán, 4000 San Miguel de Tucumán, Argentina.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|June 18, 2026

Summary

Thermal annealing in oxygen-deficient atmospheres triggers persistent photoconductivity (PPC) in PMN-PT crystals. Increasing annealing time decreases PPC, with models explaining carrier dynamics under varying UV intensities and recombination effects.

Keywords:

PMN-PT photoconductivity piezoelectric

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Area of Science:

Materials Science
Condensed Matter Physics
Solid State Chemistry

Background:

Persistent photoconductivity (PPC) is a phenomenon where conductivity remains elevated after illumination ceases.
Understanding PPC in ferroelectric crystals like PMN-PT is crucial for optoelectronic applications.

Purpose of the Study:

To investigate the induction and characteristics of UV-induced persistent photoconductivity (PPC) in commercial PMN-PT crystals.
To explore the influence of thermal annealing in oxygen-deficient atmospheres on PPC properties.
To model the time-dependent behavior of PPC under various UV intensities.

Main Methods:

Commercial PMN-PT crystals were subjected to thermal annealing in an oxygen-deficient atmosphere.
The time-dependent persistent photoconductivity (PPC) response was measured under UV illumination.
Photoconductivity data were analyzed using theoretical models incorporating carrier photogeneration, recombination, and surface effects.

Main Results:

Persistent photoconductivity (PPC) was successfully triggered by UV light in annealed PMN-PT crystals.
PPC decreased with increasing annealing time.
At low UV intensities, a model of competing photogeneration and recombination fit the data. At high intensities, an overshoot and negative PC were observed, explained by dominant radiative recombination and deep traps.
Surface band bending effects were also identified as influencing the PPC response.

Conclusions:

Thermal annealing in oxygen-deficient atmospheres is an effective method to induce UV-PPC in PMN-PT.
The observed PPC behavior is governed by a complex interplay of carrier dynamics, recombination mechanisms (including radiative recombination), deep traps, and surface effects.
The developed models provide a framework for understanding and predicting PPC in these materials under different conditions.