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

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Title: Impact of enhanced ferroelectric polarization through La doping on photovoltaic properties of BiFeO3 thin films on HOPG.
Authors: Ahn, Yoonho1,2 (AUTHOR) yhahn@koreatech.ac.kr, Son, Jong Yeog3 (AUTHOR) jyson@khu.ac.kr
Source: Journal of the American Ceramic Society. Apr2025, Vol. 108 Issue 4, p1-11. 11p.
Subjects: Thin films, Pyrolytic graphite, Band gaps, Surface structure, Ferroelectric thin films, Ferroelectricity
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. [ABSTRACT FROM AUTHOR]
Copyright of Journal of the American Ceramic Society is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
  Group: Ti
  Data: Impact of enhanced ferroelectric polarization through La doping on photovoltaic properties of BiFeO<subscript>3</subscript> thin films on HOPG.
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  Data: <searchLink fieldCode="AR" term="%22Ahn%2C+Yoonho%22">Ahn, Yoonho</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> yhahn@koreatech.ac.kr</i><br /><searchLink fieldCode="AR" term="%22Son%2C+Jong+Yeog%22">Son, Jong Yeog</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> jyson@khu.ac.kr</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+American+Ceramic+Society%22">Journal of the American Ceramic Society</searchLink>. Apr2025, Vol. 108 Issue 4, p1-11. 11p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Thin+films%22">Thin films</searchLink><br /><searchLink fieldCode="DE" term="%22Pyrolytic+graphite%22">Pyrolytic graphite</searchLink><br /><searchLink fieldCode="DE" term="%22Band+gaps%22">Band gaps</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+structure%22">Surface structure</searchLink><br /><searchLink fieldCode="DE" term="%22Ferroelectric+thin+films%22">Ferroelectric thin films</searchLink><br /><searchLink fieldCode="DE" term="%22Ferroelectricity%22">Ferroelectricity</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of the American Ceramic Society is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1111/jace.20358
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 11
        StartPage: 1
    Subjects:
      – SubjectFull: Thin films
        Type: general
      – SubjectFull: Pyrolytic graphite
        Type: general
      – SubjectFull: Band gaps
        Type: general
      – SubjectFull: Surface structure
        Type: general
      – SubjectFull: Ferroelectric thin films
        Type: general
      – SubjectFull: Ferroelectricity
        Type: general
    Titles:
      – TitleFull: Impact of enhanced ferroelectric polarization through La doping on photovoltaic properties of BiFeO3 thin films on HOPG.
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            NameFull: Ahn, Yoonho
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          Name:
            NameFull: Son, Jong Yeog
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            – D: 01
              M: 04
              Text: Apr2025
              Type: published
              Y: 2025
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              Value: 108
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              Value: 4
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            – TitleFull: Journal of the American Ceramic Society
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