Photogenerated Exciton Dissociation in Highly Coupled Lead Salt Nanocrystal Assemblies

Joshua J. Choi, Justin Luria, Byung-Ryool Hyun, Adam C. Bartnik, Liangfeng Sun, Yee-Fun Lim, John A. Marohn, Frank W. Wise, Tobias Hanrath

Research output: Contribution to journalArticlepeer-review

167 Scopus citations

Abstract

Internanocrystal coupling induced excitons dissociation in lead salt nanocrystal assemblies is investigated. By combining transient photoluminescence spectroscopy, grazing incidence small-angle X-ray scattering, and time-resolved electric force microscopy, we show that excitons can dissociate, without the aid of an external bias or chemical potential gradient, via tunneling through a potential barrier when the coupling energy is comparable to the exciton binding energy. Our results have important implications for the design of nanocrystal-based optoelectronic devices. © 2010 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)1805-1811
Number of pages7
JournalNano Letters
Volume10
Issue number5
DOIs
StatePublished - May 12 2010
Externally publishedYes

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