Synthesis and surface modification of PbSe/PbS core-shell nanocrystals for potential device applications

Jian Xu, Dehu Cui, Ting Zhu, Gary Paradee, Ziqi Liang, Qing Wang, Shengyong Xu, Andrew Y. Wang

Research output: Contribution to journalArticle

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Abstract

We report in this paper the growth of PbS shells over colloidal PbSe nanocrystal quantum dots (NQDs) with monolayer-precision. The technique of successive ion layer adsorption and reaction (SILAR) has been adapted to the growth of high-quality core-shell nanocrystals. The core-shell infrared NQDs were ligand-exchanged with short-chain octylamine, and the photoluminescence efficiency of the surface-engineered core-shell nanoparticles was substantially higher than that of the plain core structures undergoing the same surface processing, which reveals less ligand dependence and enhanced chemical robustness in the core-shell NQDs. The reported results open up the possibility of incorporating semiconductor infrared NQDs in the silicon matrix to develop all-inorganic light-emitting heterojunctions on silicon substrates.

Original languageEnglish (US)
Article number024
Pages (from-to)5428-5434
Number of pages7
JournalNanotechnology
Volume17
Issue number21
DOIs
StatePublished - Nov 14 2006

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All Science Journal Classification (ASJC) codes

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

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