Universal length dependence of rod-to-seed exciton localization efficiency in type i and quasi-type II CdSe@CdS nanorods

Kaifeng Wu, Lawrence J. Hill, Jinquan Chen, James R. McBride, Nicholas G. Pavlopolous, Nathaniel E. Richey, Jeffrey Pyun, Tianquan Lian

Research output: Contribution to journalArticle

55 Scopus citations

Abstract

A critical step involved in many applications of one-dimensional seeded CdSe@CdS nanorods, such as luminescent solar concentrators, optical gains, and photocatalysis, is the localization of excitons from the light-harvesting CdS nanorod antenna into the light-emitting CdSe quantum dot seed. We report that the rod-to-seed exciton localization efficiency decreases with the rod length but is independent of band alignment between the CdSe seed and CdS rod. This universal dependence can be well modeled by the competition between exciton one-dimensional diffusion to the CdSe seed and trapping on the CdS rod. This finding provides a rational approach for optimizing these materials for their various device applications.

Original languageEnglish (US)
Pages (from-to)4591-4599
Number of pages9
JournalACS Nano
Volume9
Issue number4
DOIs
StatePublished - Apr 28 2015

Keywords

  • CdSe@CdS
  • exciton diffusion
  • exciton localization
  • luminescent solar concentrator
  • nanoheterostructure
  • nanorods

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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    Wu, K., Hill, L. J., Chen, J., McBride, J. R., Pavlopolous, N. G., Richey, N. E., Pyun, J., & Lian, T. (2015). Universal length dependence of rod-to-seed exciton localization efficiency in type i and quasi-type II CdSe@CdS nanorods. ACS Nano, 9(4), 4591-4599. https://doi.org/10.1021/acsnano.5b01245