期刊
CHEMICAL PHYSICS
卷 422, 期 -, 页码 272-276出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemphys.2012.09.029
关键词
Semiconductor nanocrystal; Electron-phonon coupling; Resonance Raman
资金
- NSF Grant [CHE-1112192]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1112192] Funding Source: National Science Foundation
Resonance Raman spectra and absolute differential Raman cross-sections have been measured for CdSe nanocrystals in both the wurtzite and zincblende crystal forms at four excitation wavelengths from 457.9 to 514.5 nm. The frequency and bandshape of the longitudinal optical (LO) phonon fundamental is essentially identical for both crystal forms at each excitation wavelength. The LO phonon overtone to fundamental intensity ratio appears to be slightly higher for the wurtzite form, which may suggest slightly stronger exciton-phonon coupling from the Frohlich mechanism in the wurtzite form. The LO fundamental Raman cross-sections are very similar for both crystal forms at each excitation wavelength. (c) 2012 Elsevier B.V. All rights reserved.
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