{"title":"Impact of enhanced ferroelectric polarization through La doping on photovoltaic properties of BiFeO3 thin films on HOPG","authors":"Yoonho Ahn, Jong Yeog Son","doi":"10.1111/jace.20358","DOIUrl":null,"url":null,"abstract":"<p>BiFeO<sub>3</sub> (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/cm<sup>2</sup>. Photovoltaically, the 5 mol% La-doped BFO thin film exhibited an open-circuit voltage (<i>V</i><sub>oc</sub>) of 0.46 V and the highest short-circuit current (<i>J</i><sub>sc</sub>) of 0.38 mA/cm<sup>2</sup>. The 10 mol% La-doped BFO thin film achieved the highest <i>V</i><sub>oc</sub> of 0.57 V with a <i>J</i><sub>sc</sub> of 0.35 mA/cm<sup>2</sup>, 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.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 4","pages":""},"PeriodicalIF":3.5000,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the American Ceramic Society","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/jace.20358","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
引用次数: 0
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 (Voc) of 0.46 V and the highest short-circuit current (Jsc) of 0.38 mA/cm2. The 10 mol% La-doped BFO thin film achieved the highest Voc of 0.57 V with a Jsc 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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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:
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