Using nanowires to extract excitons from a nanocrystal solid

August Dorn, David B. Strasfeld, Daniel K. Harris, Hee Sun Han, Moungi G. Bawendi

Research output: Contribution to journalArticlepeer-review

Abstract

Synthetic methods yielding highly uniform colloidal semiconductor nanocrystals with controlled shapes and sizes are now available for many materials. These methods have enabled geometrical control of optical properties, which are difficult or impossible to achieve in conventional bulk solids. However, incorporating nanocrystals efficiently into photodetectors remains challenging because of the low charge carrier mobilities typical of nanocrystal solids. Here we present an approach based on exciton energy transfer from CdSe/CdS core/shell nanocrystals to embedded CdSe nanowires. By combining the wide electronic tunability of nanocrystals with the excellent one-dimensional charge transport characteristics obtainable in nanowires, we are able to increase photocurrent extraction from a nanocrystal solid by 2-3 orders of magnitude. Furthermore, we correlate local device morphology with optoelectronic functionality by measuring the local photocurrent response in a scanning confocal microscope. We also discuss how nancocrystal/nanowire hybrid devices could be used in particle detector systems.

Original languageEnglish (US)
Pages (from-to)9028-9033
Number of pages6
JournalACS Nano
Volume5
Issue number11
DOIs
StatePublished - Nov 22 2011
Externally publishedYes

Keywords

  • CdSe
  • FRET
  • cadmium selenide
  • energy transfer
  • nanocrystal
  • nanowire

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Using nanowires to extract excitons from a nanocrystal solid'. Together they form a unique fingerprint.

Cite this