外延掺锰铁酸铋薄膜电容器的光电导和光伏效应

doi:10.11896/cldb.19010221

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Abstract Epitaxial Mn-doped BiFeO₃ (BFMO) thin film was directly deposited on SrRuO₃ (SRO) buffered (001)-orientation SrTiO₃ (STO) substrate by radio frequency magnetron sputtering. Using integrated Pt/SRO to be top electrode to form the symmetric SRO/BFMO/SRO capacitor. X-ray diffraction discovers that BFMO film is of good epitaxial structure. Polarization-electric field hysteresis loops and pulsed polarization show that epitaxial SRO/BFMO/SRO capacitor possesses excellently ferroelectric polarization. The increased leakage current density is acquired when the SRO/BFMO/SRO capacitor is illuminated by the purple light of 5 mW/cm² with a wavelength of 404 nm. The leakage current density is 0.14 A/cm² and 0.34 A/cm² at 8 V without and with illumination, and 0.13 A/cm² and 0.33 A/cm² at -8 V without and with illumination, respectively. The ohmic conduction is the dominated leakage mechanism which is not changed by illumination. Photovoltaic effect of the SRO/BFMO/SRO capacitor is mainly controlled by the ferroelectric polarization. Mn doping increases the short circuit current density in photovoltaic effect of the SRO/BFMO/SRO capacitor, compared with that of pure BiFeO₃ film capacitor.

Key words： doping Mn BiFeO₃ thin film photoconductivity photovoltaic effect

Published: 12 March 2020

CLC number:	O484.1
	O482.7

Fund:This work is supported by the Fundamental Research Funds for the Central Universities (2016MS157), and the National Natural Science Foundation of China (11374086), the Natural Science Foundation of Hebei Province (A2018201168).

About author:: Zengwei Pengacquired his master's degree from Hebei University in 2005 and then had been served in College of Science and Technology of North China Electric Po-wer University. Furthermore, he achieved his doctor's degree concerning optical engineering also from Hebei University in 2013. His research area focus on photoinduced conductivity and photovoltaic property of ferroelectric materials. He has published more than 10 academic papers as the first author, including 7 SCI indexed and 4 EI indexed papers. He hosted two Fundamental Research Funds for the Central Universities. He is a reviewer of several academic journals such as Applied Physics Letters, Journal of Applied Physics,Journal of Physics D: Applied Physics,Materials Science in Semiconductor Processing.

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Cite this article:

PENG Zengwei,LIU Baoting. Photoconductivity and Photovoltaic Effect of Epitaxial Mn-doped BiFeO₃ Thin Film Capacitor[J]. Materials Reports, 2020, 34(6): 6010-6014.

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http://www.mater-rep.com/EN/10.11896/cldb.19010221 OR http://www.mater-rep.com/EN/Y2020/V34/I6/6010

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