Origin of Negative Photoconductivity at the Interface of Ba0.8Sr0.2TiO3/LaMnO3/Ba0.8Sr0.2TiO3 Heterostructures

被引：0
作者：
Chibirev, Aleksei O. [1 ]
Leontyev, Andrei, V [1 ]
Kabanov, Viktor V. [2 ]
Mamin, Rinat F. [1 ]
机构：
[1] FRC Kazan Sci Ctr RAS, Zavoisky Phys Tech Inst, Kazan 420029, Russia
[2] Jozef Stefan Inst, Dept Complex Matter, Ljubljana 1000, Slovenia
来源：
NANOMATERIALS | 2022年 / 12卷 / 21期
基金：
俄罗斯科学基金会;
关键词：
ferroelectric heterostructures; photoconductivity; thin films; screening; THERMAL-CONDUCTIVITY; ELECTRON-GAS; BATIO3;
D O I：
10.3390/nano12213774
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The study of Ba0.8Sr0.2TiO3/LaMnO3/Ba0.8Sr0.2TiO3 heterostructures on a MgO substrate with Ba0.8Sr0.2TiO3 ferroelectric films revealed the occurrence of a metallic character of the temperature behavior of the resistance at a temperature less than 175 K. This behavior is associated with an increased charge concentration at the interface due to a discontinuity in the ferroelectric polarization at the interface between the films. At these temperatures, the effect of negative photoconductivity is observed under uniform illumination with the light of a selected spectral composition event on the surface of the ferroelectric film. The combined exposure to green and infrared light led to an addition of the effects. As a result, a cumulative effect was observed. The effect of metallic conductivity is due to the discontinuity of ferroelectric polarization. Therefore, we explain that the partial screening of the ferroelectric polarization by photogenerated charge carriers causes a reduction in the carrier concentration at the interface. Measurements in the Kelvin mode of atomic force microscopy showed that illumination influences the surface charge concentration in a similar way; this observation confirms our hypothesis.
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页数：10
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