Combination of Cation Exchange and Quantized Ostwald Ripening for Controlling Size Distribution of Lead Chalcogenide Quantum Dots

Matthew Beard, Changwang Zhang, Yong Xia, Zhiming Zhang, Zhen Huang, Linyuan Lian, Xiangshui Miao, Daoli Zhang, Jianbing Zhang

Research output: Contribution to journalArticlepeer-review

44 Scopus Citations

Abstract

A new strategy for narrowing the size distribution of colloidal quantum dots (QDs) was developed by combining cation exchange and quantized Ostwald ripening. Medium-sized reactant CdS(e) QDs were subjected to cation exchange to form the target PbS(e) QDs, and then small reactant CdS(e) QDs were added which were converted to small PbS(e) dots via cation exchange. The small-sized ensemble of PbS(e) QDs dissolved completely rapidly and released a large amount of monomers, promoting the growth and size-focusing of the medium-sized ensemble of PbS(e) QDs. The addition of small reactant QDs can be repeated to continuously reduce the size distribution. The new method was applied to synthesize PbSe and PbS QDs with extremely narrow size distributions and as a bonus they have hybrid surface passivation. The size distribution of prepared PbSe and PbS QDs are as low as 3.6% and 4.3%, respectively, leading to hexagonal close packing in monolayer and highly ordered three-dimensional superlattice.

Original languageAmerican English
Pages (from-to)3615-3622
Number of pages8
JournalChemistry of Materials
Volume29
Issue number8
DOIs
StatePublished - 25 Apr 2017

Bibliographical note

Publisher Copyright:
© 2017 American Chemical Society.

NREL Publication Number

  • NREL/JA-5900-67789

Keywords

  • PbS
  • PbSe
  • quantum dot surface chemistry
  • quantum dot synthesis
  • quantum dots

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