Heavily doped semiconductor nanocrystal quantum dots

David Mocatta, Guy Cohen, Jonathan Schattner, Oded Millo*, Eran Rabani, Uri Banin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Doping of semiconductors by impurity atoms enabled their widespread technological application in microelectronics and optoelectronics. However, doping has proven elusive for strongly confined colloidal semiconductor nanocrystals because of the synthetic challenge of how to introduce single impurities, as well as a lack of fundamental understanding of this heavily doped limit under strong quantum confinement. We developed a method to dope semiconductor nanocrystals with metal impurities, enabling control of the band gap and Fermi energy. A combination of optical measurements, scanning tunneling spectroscopy, and theory revealed the emergence of a confined impurity band and band-tailing. Our method yields n- and p-doped semiconductor nanocrystals, which have potential applications in solar cells, thin-film transistors, and optoelectronic devices.

Original languageEnglish
Pages (from-to)77-81
Number of pages5
JournalScience
Volume332
Issue number6025
DOIs
StatePublished - 1 Apr 2011

Funding

FundersFunder number
Seventh Framework Programme203413

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