Impact of enhanced ferroelectric polarization through La doping on photovoltaic properties of BiFeO3 thin films on HOPG

IF 3.8 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Journal of the American Ceramic Society Pub Date : 2025-01-02 DOI:10.1111/jace.20358

Yoonho Ahn, Jong Yeog Son

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Abstract

BiFeO₃ (BFO) thin films are well-known for their multiferroic and photovoltaic properties, driving extensive research into potential applications. Highly ordered pyrolytic graphite (HOPG) substrates, with a graphene-like surface structure, provide an ideal platform for assessing the impact of graphene electrodes. This study investigates the photovoltaic properties of ITO/BFO/HOPG devices with La-doped BFO thin films at concentrations of 5, 10, and 15 mol%. The polycrystalline BFO thin films exhibited a preferential (111) orientation, with the 10 mol% La-doped thin films demonstrating optimal crystallinity and the highest remanent polarization of 50.8 µC/cm². Photovoltaically, the 5 mol% La-doped BFO thin film exhibited an open-circuit voltage (V_oc) of 0.46 V and the highest short-circuit current (J_sc) of 0.38 mA/cm². The 10 mol% La-doped BFO thin film achieved the highest V_oc of 0.57 V with a J_sc of 0.35 mA/cm², likely because of enhanced ferroelectric polarization. In contrast, the 15 mol% La-doped BFO thin film showed a reduced band gap but diminished photovoltaic performance. The minimal variation in the band gap (within 0.1 eV) suggests that the improved photovoltaic performance is primarily driven by increased polarization resulting from enhanced tetragonality.

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La掺杂增强铁电极化对HOPG上BiFeO3薄膜光伏性能的影响

BiFeO3 （BFO）薄膜以其多铁性和光伏特性而闻名，推动了对潜在应用的广泛研究。高度有序的热解石墨（HOPG）衬底具有类似石墨烯的表面结构，为评估石墨烯电极的影响提供了理想的平台。本研究考察了掺杂浓度分别为5%、10%和15% mol%的BFO薄膜的ITO/BFO/HOPG器件的光伏性能。多晶BFO薄膜表现出优先（111）取向，其中掺杂10 mol% la的薄膜结晶度最佳，剩余极化率最高，为50.8µC/cm2。在光电性能方面，掺la含量为5 mol%的BFO薄膜开路电压（Voc）为0.46 V，最高短路电流（Jsc）为0.38 mA/cm2。10 mol% la掺杂的BFO薄膜Voc最高，为0.57 V， Jsc为0.35 mA/cm2，这可能是由于铁电极化增强所致。相比之下，掺15mol % la的BFO薄膜带隙减小，但光伏性能下降。带隙的最小变化（0.1 eV以内）表明，光电性能的提高主要是由四边形增强导致的极化增加驱动的。

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.