• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Study of photo-induced atomic processes on semiconductor surfaces by means of femtosecond spectroscopy

Research Project

Project/Area Number 09440115
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅰ(光物性・半導体・誘電体)
Research InstitutionNagoya University

Principal Investigator

TANIMURA Katsumi  Graduate School of Science, Nagoya University, Professor, 大学院・理学研究科, 教授 (00135328)

Co-Investigator(Kenkyū-buntansha) AKIMOTO Ikuko  Graduate School of Science, Nagoya University, Research Associate, 大学院・理学研究科, 助手 (00314055)
ITOH Chihiro  Graduate School of Science, Nagoya University, Research Associate, 大学院・理学研究科, 助手 (60211744)
KANASAKI Junichi  Graduate School of Science, Nagoya University, Research Associate, 大学院・理学研究科, 助手 (80204535)
Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥14,000,000 (Direct Cost: ¥14,000,000)
Fiscal Year 1999: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1998: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 1997: ¥7,900,000 (Direct Cost: ¥7,900,000)
Keywordsreconstructed surface / desorption / photo-induced structural changes / STM / femtosecond spectroscopy / 細構成表面
Research Abstract

The purpose of this project is to make clear the microscopic processes of laser-induced electronic instability on clean semiconductor surfaces. The surfaces of Si(111)-(7x7) and InP(110)-(1x1) in an UHY chamber were excited either by fs-laser pulses for dynamical study or by ns- laser pulses for spectroscopy. Structural changes induced were studied by direct imaging of the atomic structures by scanning tunneling microscope (STM) and by high-sensitive detection of desorbed neutral species. Main results obtained in this project are summarized below.
1) On Si(111)-(7x7), which is a proto-typical example of reconstructed semiconductor surfaces, laser-induced electronic instability is induced by the surface-specific electronic transition at 2.0 eV, followed by non-linear localization to induce bond breaking of adatoms on the surface. Two-hole localization followed by the phonon-kick process has been proposed to be the origin of the instability.
2) On InP(110)-(1x1), which shows quasi-one dime … More nsional atomic and electronic properties, similar laser-induced electronic instability is induced, but with strongly wavelength-dependent morphologies in structural changes. Upon exciting surface specific transitions, P-vacancy strings are generated along [110] direction, while two-dimensional vacancy islands are developed upon bulk-electronic excitation. These characteristics can be ascribed to different properties of photo-generated excited species in surface states and in bulk electronic states ; the former shows one-dimensional nature, while the latter is isotropic in mobility.
3) For studying desorption induced as a result of surface-structural changes, we successfully developed a new method of femtosecond non-resonant ionization spectroscopy (FNRIS) for detecting several neutral species simultaneously with high sensitivity. This method was applied for InP surfaces to show that desorption processes are also strongly super-linear with respect to the excitation intensity, similarly to the case of vacancy formation on the surface. Also, primary product of desorption has been confirmed to be monoatomic P and In atoms for clean (1x1) surface, being consistent with STM observation. Our results obtained in this project is the first demonstration of FNRIS to be a powerful tool for studying desorption from compound semiconductor surfaces. Less

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] K.Tanimura and J.Kanasaki: "Laser-Induced Bond Breaking and Structural Changes on Si(111)-7x7 Surfaces"Applied Surface Science. 127-129. 33-39 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] J.Kanasaki, T.Ishida, K.Ishikawa, and K. Tanimura: "Laser-Induced Electronic Bond Breaking and Desorption of Si Adatoms from the Si(111)-7x7 Surface"Physical Review Letters. 80. 4080-4083 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] J.Kanasaki, K.Iwata, and K.Tanimura: "Translational Energy Distribution of Si Atoms Desorbed by Laser-Induced Electronic Bond Breaking of Adatoms on Si(111)-(7x7)"Physical Review Letters. 82. 644-647 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 金崎順一、谷村克巳: "半導体表面構造の光誘起変化と構成原子の脱離"固体物理. 34. 657-668 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] J.Kanasaki, N.Mikasa, and K.Tanimura: "Laser-Induced Electronic Desorption from InP Surfaces Studied by the Femtosecond Non-resonant Ionization Spectroscopy"Physical Review B. (to be published).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. Tanimura and J. Kanasaki: "Laser-induced bond breaking and structural changes on Si(111)-7x7 surfaces"Appl.Surf.Sci.. 127-129. 33-39 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] J. Kanasaki, T, Ishida, K. Ishikawa, and K. Tanimura: "Laser-induced electronic bond breaking and desorption of Si adatoms on Si(111)-(7x7)"Phys.Rev.Lett.. 80-18. 4080-4083 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] J. Kanasaki, K. Iwata and K. Tanimura: "Translationa energy distribution of Si atoms desorbed by Laser-induced electronic bond breaking of adatoms on Si(111)-(7x7)"Phys.Rev.Lett.. 82-3. 644-647 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] J. Kanasaki and K. Tanimura: "Photo-induced structural changes and desorption from semiconductor surfaces (in Japanese)"Solid State Physics. 34-8. 1-12 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] J. Kanasaki, N. Mikasa, and K. Tanimura: "Laser-induced electronic desorption from InP surfaces studied by the femtosecond non-resonant ionization spectroscopy"Phys.Rev.B. (to be published).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K.Tanimura and J.Kanasaki: "Laser-induced electronic bond breaking and structural changes on semiconductor surfaces"Proceedings of SPIE. 3618. 26-36 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 金崎順一、谷村克巳: "半導体表面構造の光誘起変化と構成原子の脱離"固体物理. 34. 657-668 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] J.Kanasaki: "Translational energy distribution of Si atoms desorved by laser-induced bond breaking of adatoms on Si(111)" Physical Review Letters. 82. 644-647 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Tanimura: "Laser-induced electronic bond breaking and structural changes on semiconductor surfaces" Laser applications in microelectronic and optoelectronic manufacturing IV(proceedings). (in print).

    • Related Report
      1998 Annual Research Report
  • [Publications] J.Kanasaki: "Laser-induced electronic bond breaking of adatoms on Si(111)-7X7" Physical Review Letters. (in print).

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Tanimura: "Laser-induced bond breaking and structural changes on Si(111)-7X7 surfaces" Applied Surface Science. ( in print).

    • Related Report
      1997 Annual Research Report

URL: 

Published: 1997-04-01   Modified: 2020-05-15  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi