Size and Bandgap Control in the Solution-Phase Synthesis of Near-Infrared-Emitting Germanium Nanocrystals

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Abstract

We present a novel colloidal synthesis of alkyl-terminated Ge nanocrystals based on the reduction of GeI4/GeI2 mixtures. The size of the nanocrystals (2.3-11.3 nm) was controlled by adjusting both the Ge(IV)/Ge(II) ratio and the temperature ramp rate following reductant injection. The near-infrared absorption (1.6-0.70 eV) and corresponding band-edge emission demonstrate the highly tunable quantum confinement effects in Ge nanocrystals prepared using this mixed-valence precursor method. A mechanism is proposed for the observed size control, which relies upon the difference in reduction temperatures for Ge(II) versus Ge(IV).

Original languageAmerican English
Pages (from-to)7459-7466
Number of pages8
JournalACS Nano
Volume4
Issue number12
DOIs
StatePublished - 2010

NREL Publication Number

  • NREL/JA-5900-49850

Keywords

  • bandgap control
  • germanium nanocrystal
  • infrared emission
  • mechanism
  • quantum confinement
  • size control

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