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Electric-field modulated photovoltaic effect of ferroelectric double-perovskite Bi2FeMnO6films
Applied Physics Letters ( IF 4 ) Pub Date : 2021-09-09 , DOI: 10.1063/5.0059637
Jianjun Lin 1 , Peng Shen 1 , Yuan Liu 1 , Fangyu Yue 1 , Ye Chen 1 , Zhiyong Zhou 2 , Pingxiong Yang 1 , Junhao Chu 1, 3 , Chun-Gang Duan 1 , Lin Sun 1
Affiliation  

Ferroelectric perovskite oxide materials for photovoltaics (PV) have received considerable attention for their switchable PV responses and above-bandgap photovoltages as a type of new-generation PV device. Relatively large bandgap and low photocurrent remain major problems for their PV applications. Herein, we report the PV response of ferroelectric double-perovskite Bi2FeMnO6 (BFMO) thin films. It was found that the photocurrent density (Jsc) of a Sn:In2O3 (ITO)/BFMO/SrRuO3 (SRO) thin film device is two orders of magnitude higher than that of BiFeO3, and its power conversion efficiency is about 430 times larger than that of BiFeO3 under AM 1.5G illumination. The built-in electric field near the BFMO/SRO interface, which represents the Schottky contact, leads to the separation of photon-generated carriers. More importantly, the electric poling treatment on the BFMO device can manipulate significantly the magnitude of Jsc, which is independent of the polarization direction. This electric-field modulated PV effect in the poled BFMO device originates from the modulation of the Schottky barrier height at the BFMO/SRO interface. The redistribution of oxygen vacancies after electric poling treatment is mainly responsible for the modulation of the Schottky barrier height.

中文翻译:

铁电双钙钛矿Bi2FeMnO6薄膜的电场调制光伏效应

用于光伏 (PV) 的铁电钙钛矿氧化物材料因其可切换的光伏响应和高于带隙的光电压作为一种新一代光伏器件而受到广泛关注。相对大的带隙和低光电流仍然是其光伏应用的主要问题。在此,我们报告了铁电双钙钛矿 Bi 2 FeMnO 6 (BFMO) 薄膜的 PV 响应。结果发现,光电流密度(Ĵ SC部分Sn):在2 Ó 3(ITO)/ BFMO /的SrRuO 3(SRO)薄膜器件是两个数量级比的BiFeO的更高3,并且其功率转换效率比BiFeO 3大约430倍在 AM 1.5G 照明下。BFMO/SRO 界面附近的内置电场(代表肖特基接触)导致光生载流子的分离。更重要的是,BFMO 器件上的电极化处理可以显着控制J sc的大小,这与极化方向无关。极化 BFMO 器件中的这种电场调制 PV 效应源于 BFMO/SRO 界面处肖特基势垒高度的调制。电极化处理后氧空位的重新分布主要负责调节肖特基势垒高度。
更新日期:2021-09-10
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