title: A microscopic picture of surface charge trapping in semiconductor nanocrystals.
abstract: Several different compositions of semiconductor nanocrystals are subjected to numerous spectroscopic techniques to elucidate the nature of surface trapping in these systems. We find a consistent temperature-dependent relationship between core and surface photoluminescence intensity and marked differences in electron-phonon coupling for core and surface states based on ultrafast measurements and Resonance Raman studies, respectively. These results support a minimal model of surface charge trapping applicable to a range of nanocrystal systems involving a single surface state in which the trapped charge polarization leads to strong phonon couplings, with transitions between the surface and band edge excitonic states being governed by semiclassical electron-transfer theory.
authors.affiliation: Department of Chemistry, McGill University, Montreal, Quebec H3A 0B8, Canada.
authors.forename: Jonathan
authors.initials: J
authors.lastname: Mooney
authors.forename: Michael M
authors.initials: MM
authors.lastname: Krause
authors.forename: Jonathan I
authors.initials: JI
authors.lastname: Saari
authors.forename: Patanjali
authors.initials: P
authors.lastname: Kambhampati
mesh_terms: D049449:Luminescence; D008853:Microscopy; D053758:Nanoparticles / Q000737:chemistry*; D012666:Semiconductors; D013059:Spectrum Analysis, Raman; D013499:Surface Properties; D013696:Temperature