Size dependence of second harmonic generation in CdSe nanocrystal quantum dots

Michal Jacobsohn, Uri Banin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Second harmonic generation in CdSe nanocrystal quantum dots is observed by Hyper-Rayleigh scattering. The size dependence of the first hyperpolarizibility β was investigated for the nanocrystals in solution. The value of β per nanocrystal decreases with size down to approximately 13 Å in radius. An increase is observed with further size reduction. The unit cell normalized second harmonic coefficient, β, shows a substantial systematic enhancement in small diameters. The observed size dependence of the second harmonic generation is explained assuming two contributions. The first is a bulklike contribution, from the noncentrosymmetric nanocrystal core, and the second, a contribution from the nanocrystal surface. The latter contribution is most significant in small nanocrystals with a substantial proportion of surface atoms. This result suggests that the second harmonic generation technique may be used as a probe of nanocrystal surfaces, in analogy to its common use as a probe of bulk surfaces.

Original languageAmerican English
Pages (from-to)4-5
Number of pages2
JournalJournal of Physical Chemistry B
Volume104
Issue number1
DOIs
StatePublished - 13 Jan 2000

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