Picosecond carrier dynamics induced by coupling of wavefunctions in a Si-nanodisk array fabricated by neutral beam etching using bio-nano-templates

Takayuki Kiba, Yoshiya Mizushima, Makoto Igarashi, Seiji Samukawa, Akihiro Murayama

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The picosecond carrier dynamics in a closely packed Si-nanodisk (Si-ND) array with ultrathin potential barrier fabricated by neutral beam etching using bio-nano-templates was investigated by time-resolved photoluminescence (PL). The PL decay curves were analyzed as a function of photon energy by the global fitting method. We show three spectral components with different decay times, where the systematic energy differences of the spectral peaks are clarified: 2.03 eV for the fastest decaying component with a decay time τ = 40 ps, 2.02 eV for τ = 300 ps, and 2.00 eV for τ = 1.6 ns. These energy separations ranging from 10 to 30 meV among the emissive states can be attributed to the coupling of wavefunctions of carriers between neighboring NDs.

Original languageEnglish
Article number587
Pages (from-to)1-5
Number of pages5
JournalNanoscale Research Letters
Volume7
DOIs
Publication statusPublished - 2012

Keywords

  • Bio-nano-templates
  • Carrier dynamics
  • Neutral beam etching
  • Silicon nanostructures
  • Time-resolved photoluminescence

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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