# Giant Enhancement in Ferroelectric Polarization under Illumination

## TL;DR

This study demonstrates a significant optical enhancement of ferroelectric polarization and dielectric properties in PLBZT ceramics under illumination, revealing potential for optoelectronic applications.

## Contribution

It reports a novel large polarization increase in PLBZT ferroelectrics under light, a phenomenon not previously documented in similar materials.

## Key findings

- 200-300% increase in polarization under illumination
- Large switchable open circuit voltage (~2 V)
- Significant change in conduction current density

## Abstract

We report optical enhancement in polarization and dielectric constant near room temperature in Pb0.6Li0.2Bi0.2Zr0.2Ti0.8O3 (PLBZT) electro-ceramics; these are doubly substituted members of the most important commercial ferroelectric PbZr0.2Ti0.8O3 (PZT:20/80). Partial (40%) substitution of equal amounts of Li+1 and Bi+3 in PZT: 20/80 retains the PZT tetragonal structure with space group P4mm. Under illumination of white light and weak 405-nm near-ultraviolet laser light (30 mW), an unexpectedly large (200-300%) change in polarization and displacement current was observed. Light also changes the dc conduction current density by one to two orders of magnitude with a large switchable open circuit voltage (Voc ~ 2 V) and short circuit current (Jsc ~ 5x10-8 A). The samples show a photo-current ON/OFF ratio of order 6:1 under illumination of weak light.

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Source: https://tomesphere.com/paper/1706.08038