Direct observation of vacancy in silicon using sub-Kelvin ultrasonic measurements

Terutaka Goto, Hiroshi Yamada-Kaneta, Yasuhiro Saito, Yuichi Nemoto, Koji Sato, Koichi Kakimoto, Shintaro Nakamura

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8 Citations (Scopus)


We carried out sub-Kelvin ultrasonic measurements for observation of vacancies in crystalline silicon. The longitudinal elastic constants of non-doped and B-doped floating zone (FZ) silicon crystals in commercial base revealed low-temperature elastic softening below 20 K. The applied magnetic fields turns the softening of the B-doped FZ silicon to a temperature-independent behavior, while the fields up to 16 T at base temperature 20 mK make no effect on the softening of the non-doped FZ silicon. This result means that the vacancy accompanying the non-magnetic charge state V0 in the non-doped silicon and the magnetic V+ in the B-doped silicon is responsible for the low-temperature softening through the Jahn-Teller effect. The direct observation of the vacancy using the sub-Kelvin ultrasonic measurements advances point defects controlling in silicon wafers and semiconductor devices.

Original languageEnglish
Pages (from-to)233-239
Number of pages7
JournalMaterials Science and Engineering: B
Issue number2-3 SPEC. ISS.
Publication statusPublished - Oct 15 2006

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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