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A reversible positive and negative photoconductivity behavior modulated by polarization effect.

A reversible positive and negative photoconductivity behavior modulated by polarization effect.

Authors :
Tang, Zhenhua
Lai, Xi-Cai
Fang, Junlin
Feng, Leyan
Yao, Di-Jie
Zhang, Li
Jiang, Yan-Ping
Liu, Qiu-Xiang
Tang, Xin-Gui
Zhou, Yi-Chun
Gao, Ju
Source :
Applied Physics Letters; 12/9/2024, Vol. 125 Issue 24, p1-7, 7p
Publication Year :
2024

Abstract

Negative photoconductive devices exhibit a significant reduction in conductivity under illumination, enabling high-contrast optical modulation and promising great potential in optics. In this study, an ITO/BFCO/TiO<subscript>2</subscript>/FTO device was simply fabricated through a synergistic application of sol-gel and magnetron sputtering techniques. Interestingly, the ferroelectric polarization can be reversibly modulated by a low bias voltage in the ITO/BFCO/TiO<subscript>2</subscript>/FTO device, thereby exhibiting bipolar voltage dependent reversible behavior of positive and negative photoconductivity. This mechanism has been discussed, where the combined effect of illumination and applied voltage induces internal polarization reversal in Bi<subscript>2</subscript>FeCrO<subscript>6</subscript>, leading to a transition in the resistance state from low to high. This transition results in an elevation of the energy band, thereby impeding the migration of charge carriers. Additionally, femtosecond laser transient absorption spectroscopy reveals redshift in the initial absorption peak, indicating changes in the band structure induced by illumination, crucial for understanding carrier dynamics in a non-equilibrium state. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00036951
Volume :
125
Issue :
24
Database :
Complementary Index
Journal :
Applied Physics Letters
Publication Type :
Academic Journal
Accession number :
181644778
Full Text :
https://doi.org/10.1063/5.0248034