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2013 Fiscal Year Final Research Report

Photovoltaic effects and photocarrier dynamics driven by depolarization field in ferroelectric semiconductors

Research Project

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Project/Area Number 24740202
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Condensed matter physics I
Research InstitutionKyoto University

Principal Investigator

YAMADA Yasuhiro  京都大学, 化学研究所, 特定准教授 (50532636)

Project Period (FY) 2012-04-01 – 2014-03-31
Keywords強誘電体 / 光起電力 / 時間分解分光 / 光電流
Research Abstract

Ferroelectric materials possess macroscopic polarization without external field. The spontaneous polarization in ferroelectrics causes bulk-photovoltaic effects: charge separation of photoexcited carriers occurs due to depolarization field, which results in photovoltage along the spontaneous polarization. In this study, the photocarrier recombination and relaxation dynamics in ferroelectric semiconductor BiFeO3 thin films by means of time-resolved transient absorption and photocurrent spectroscopy. This study revealed that photocarriers are trapped into shallow impurity state and the trapped carriers have long lifetimes. The long-lived carriers are related to the large photovoltage in BiFeO3 thin films.

  • Research Products

    (11 results)

All 2014 2013 2012 Other

All Journal Article (4 results) (of which Peer Reviewed: 4 results) Presentation (6 results) Remarks (1 results)

  • [Journal Article] Spatial density profile of electrons near the LaAlO3/SrTiO3 heterointerface revealed by time-resolved photoluminescence spectroscopy2014

    • Author(s)
      Y. Yamada, H. K. Sato, Y. Hikita, H. Y. Hwang, and Y. Kanemitsu
    • Journal Title

      Appl. Phys. Lett.

      Volume: 104 Pages: 151907 (4pages)

    • DOI

      10.1063/1.4872171

    • Peer Reviewed
  • [Journal Article] Photocarruer recombination and localization dynamics of LaAlO3^/SrTiO3 heterostructures2014

    • Author(s)
      Y. Yamada, H. K. Sato, Y. Hikita, H. Y. Hwang, and Y. Kanemitsu
    • Journal Title

      Proc. SPIE

      Volume: 8987 Pages: 898710 (7pages)

    • DOI

      10.1117/12.2038785

    • Peer Reviewed
  • [Journal Article] Measurement of transient photoabsorption and photocurrent of ^BiFeO3 ^<th>in films : Evidence for long-lived trapped photocarriers2014

    • Author(s)
      Y. Yamada, T. Nakamura, S. Yasui, H. Funakubo, and Y. Kanemitsu
    • Journal Title

      Phys. Rev. B

      Volume: 89 Pages: 035133 (5pages)

    • DOI

      10.1103/PhysRevB.89.035133

    • Peer Reviewed
  • [Journal Article] Measurement of the Femtosecond Optical Absorption of LaAlO3/SrTiO3 Heterostructures : Evidence for an Extremely Slow Electron Relaxation at the Interface2013

    • Author(s)
      Y. Yamada, H. K. Sato, Y. Hikita, H. Y. Hwang, and Y. Kanemitsu
    • Journal Title

      Phys. Rev. Lett.

      Volume: 111 Pages: 047403 (5pages)

    • DOI

      10.1103/PhysRevLett.111.047403

    • Peer Reviewed
  • [Presentation] 強誘電体BiFeO3における長寿命伝導キャリアの観測2013

    • Author(s)
      中村透,山田泰裕,安井伸太郎,舟窪浩,金光義彦
    • Organizer
      第24回光物性研究会
    • Place of Presentation
      大阪市立大学
    • Year and Date
      20131213-14
  • [Presentation] Ultrafast Photoresponses in Ferroelectric BiFeO3 Thin Films2013

    • Author(s)
      T. Nakamura, Y. Yamada, S. Yasui, H. Funakubo, and Y. Kanemitsu
    • Organizer
      2013 JSAP-MRS Joint Symposia
    • Place of Presentation
      Kyoto, Japan
    • Year and Date
      20130916-20
  • [Presentation] Dynamics of photogenerated carriers in ferroelectric BiFeO3 thin films2013

    • Author(s)
      T. Nakamura, Y. Yamada, S. Yasui, H. Funakubo, and Y. Kanemitsu
    • Organizer
      The 18th International Conference on Electron Dynamics in Semiconductors, Optoelectronics and Nanostructures (EDISON 18)
    • Place of Presentation
      Shimane, Japan
    • Year and Date
      20130722-26
  • [Presentation] 白色ポンプ・プローブ法によるBiFeO3薄膜の過渡吸収ダイナミクス2013

    • Author(s)
      中村透,山田泰裕,安井伸太郎,舟窪浩,金光義彦
    • Organizer
      第60回応用物理学会春季学術講演会
    • Place of Presentation
      神奈川工科大学
    • Year and Date
      20130327-30
  • [Presentation] 過渡吸収分光による強誘電体BiFeO_3の光キャリアダイナミクス2012

    • Author(s)
      中村透,山田泰裕,安井伸太郎,舟窪浩,金光義彦
    • Organizer
      第23回光物性研究会
    • Place of Presentation
      大阪市立大学
    • Year and Date
      20121207-08
  • [Presentation] 過渡吸収分光による強誘電体BiFe_<1-x>CoxO_3薄膜の光キャリアダイナミクス2012

    • Author(s)
      中村透,山田泰裕,安井伸太郎,舟窪浩,金光義彦
    • Organizer
      日本物理学会2012年秋季大会
    • Place of Presentation
      横浜国立大学
    • Year and Date
      20120918-21
  • [Remarks]

    • URL

      http://www.scl.kyoto-u.ac.jp/~opt-nano/NIP/

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Published: 2015-06-25  

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