Controlled placement of colloidal quantum dots in sub-15 nm clusters

Vitor R. Manfrinato, Darcy D. Wanger, David B. Strasfeld, Hee Sun Han, Francesco Marsili, Jose P. Arrieta, Tamar S. Mentzel, Moungi G. Bawendi, Karl K. Berggren

Research output: Contribution to journalArticlepeer-review

Abstract

We demonstrated a technique to control the placement of 6 nm-diameter CdSe and 5 nm-diameter CdSe/CdZnS colloidal quantum dots (QDs) through electron-beam lithography. This QD-placement technique resulted in an average of three QDs in each cluster, and 87% of the templated sites were occupied by at least one QD. These QD clusters could be in close proximity to one another, with a minimum separation of 12 nm. Photoluminescence measurements of the fabricated QD clusters showed intermittent photoluminescence, which indicates that the QDs were optically active after the fabrication process. This optimized top-down lithographic process is a step towards the integration of individual QDs in optoelectronic and nano-optical systems.

Original languageEnglish (US)
Article number125302
JournalNanotechnology
Volume24
Issue number12
DOIs
StatePublished - Mar 29 2013
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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