Temperature dependence of time-resolved photoluminescence in closely packed alignment of Si nanodisks with SiC barriers

Takayuki Kiba, Yoshiya Mizushima, Makoto Igarashi, Chi Hsien Huang, Seiji Samukawa, Akihiro Murayama

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

We study the temperature dependence of time-resolved photoluminescence (PL) in closely packed alignment of Si nanodisks (NDs) with SiC barriers, fabricated by neutral beam etching using bio-nano-templates. The PL time profile indicates three decaying components with different decay times. The PL intensities in the two slower decaying components depend strongly on temperature. These temperature dependences of the PL intensity can be quantitatively explained by a three-level model with thermal activation energies of 410 and 490 meV, depending on the PL components. The activation energies explain PL quenching due to thermal escape of electrons from individual NDs. This thermal escape affects the PL decay times above 250 K. Dark states of photo-excited carriers originating from the separate localization of electron and hole into different NDs are elucidated with the localization energies of 70 and 90 meV. In contrast, the dynamics of the fastest PL decaying component is dominated by electron tunneling among NDs, where the PL intensity and decay time are constant for temperature.

Original languageEnglish
Article number223
Pages (from-to)1-7
Number of pages7
JournalNanoscale Research Letters
Volume8
Issue number1
DOIs
Publication statusPublished - 2013

Keywords

  • Bio-nano-templates
  • Neutral beam etching
  • Si nanodisks
  • Time-resolved photoluminescence

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Temperature dependence of time-resolved photoluminescence in closely packed alignment of Si nanodisks with SiC barriers'. Together they form a unique fingerprint.

Cite this