Mapping the spatial distribution of charge carriers in quantum-confined heterostructures

Andrew M. Smith, Lucas A. Lane, Shuming Nie

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)


Quantum-confined nanostructures are considered 'artificial atoms' because the wavefunctions of their charge carriers resemble those of atomic orbitals. For multiple-domain heterostructures, however, carrier wavefunctions are more complex and still not well understood. We have prepared a unique series of cation-exchanged HgxCd1xTe quantum dots (QDs) and seven epitaxial core-shell QDs and measured their first and second exciton peak oscillator strengths as a function of size and chemical composition. A major finding is that carrier locations can be quantitatively mapped and visualized during shell growth or cation exchange simply using absorption transition strengths. These results reveal that a broad range of quantum heterostructures with different internal structures and band alignments exhibit distinct carrier localization patterns that can be used to further improve the performance of optoelectronic devices and enhance the brightness of QD probes for bioimaging.

Original languageEnglish
Article number4506
JournalNature Communications
Publication statusPublished - Jul 31 2014
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Biochemistry,Genetics and Molecular Biology
  • General Physics and Astronomy


Dive into the research topics of 'Mapping the spatial distribution of charge carriers in quantum-confined heterostructures'. Together they form a unique fingerprint.

Cite this