Energetics of photoinduced electron-transfer reactions decided by quantum confinement

Gregory D. Scholes, Marcus Jones, Sandeep Kumar

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

The photophysics of linear CdSe-CdTe nanorod heterostructures are reported. Charge-transfer emission and absorption bands are identified. Analysis of these bands reveals the factors governing photoinduced electron transfer from CdTe to CdSe, and it is thereby shown how quantum confinement effects decide the thermodynamic parameters of the Marcus-Hush theory. An important finding is the very small reorganization energy associated with the nuclear degrees of freedom (∼20 meV in toluene), which seems to be a characteristic of these nanoscale donor-acceptor systems and differentiates them from most analogous molecular systems. Therefore Marcus "inverted region" behavior is found to be typical for these systems. By analyzing the mixing between the CdTe exciton and the charge-transfer states for one sample, we find the electronic coupling matrix element that promotes the charge separation to be ∼50 meV.

Original languageEnglish (US)
Pages (from-to)13777-13785
Number of pages9
JournalJournal of Physical Chemistry C
Volume111
Issue number37
DOIs
StatePublished - Sep 20 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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