Observation of Long Relaxation from Fe0(3d8) to Fe+(3d7) by Electron Spin Resonance Measurement

Takeshi Ishiyama, Toshinobu Hiramatsu, Yoshifumi Yamashita, Yoichi Kamiura

Research output: Contribution to journalArticlepeer-review


We studied the change in the 3d-shell configurations of Fe in B-doped Si under illumination by electron spin resonance (HSR) measurement. ESR signals originating from Fei+(3d7) and Fe i0(3d8) were observed in Fe- and B-doped Si. The ESR signal of Fei+(3d7) disappeared and the signal intensity of Fei0(3d8) increased under illumination. These changes of the ESR signals under illumination were caused by the change in the charge state from Fei+(3d7) to Fei0(3d8) due to the capture of an electron. Subsequently, the process of recovery from Fei0(3d 8) to Fei+(3d7) due to the capture of a hole was observed after the light was turned off. We found that the relaxation time from Fei0(3d8) to Fe i+(3d7) was approximately 30 s at 8 K. This was much longer than the lifetime of a free hole.

Original languageEnglish
Pages (from-to)9-11
Number of pages3
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number1
Publication statusPublished - Jan 2004


  • 3d-electron
  • Charge state
  • Electron spin resonance
  • Fe
  • Silicon

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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