10.1021/jp909466b.s002
Marcelo Alves-Santos
Marcelo
Alves-Santos
Rosa Di Felice
Rosa Di
Felice
Guido Goldoni
Guido
Goldoni
Dielectric Functions of Semiconductor Nanoparticles from the Optical Absorption Spectrum: The Case of CdSe and CdS
American Chemical Society
2010
spectroscopic data
data sets
CdSe
bulk dielectric function
absorption spectrum
NP dielectric function
Dielectric Functions
absorption spectra
absorption edge
energy range
Semiconductor Nanoparticles
Optical Absorption Spectrum
CdS NPs
iterative procedure
semiconductor nanoparticles
2010-03-11 00:00:00
Dataset
https://acs.figshare.com/articles/dataset/Dielectric_Functions_of_Semiconductor_Nanoparticles_from_the_Optical_Absorption_Spectrum_The_Case_of_CdSe_and_CdS/2785183
We propose a new method to extract the complete size-dependent complex dielectric function ε(<i>E</i>) of semiconductor nanoparticles (NPs) from spectroscopic data. Typical experimental absorption spectra are available in a limited energy range near the absorption edge. We show that this limitation can be overcome by matching the NP dielectric function with the bulk dielectric function at high energies beyond the experimental range. Thus, using the Kramers−Krönig relations that link the real and imaginary parts, it is possible to extract the complete ε(<i>E</i>) of the NP. This is achieved through an iterative procedure that systematically improves the trial ε(<i>E</i>) until the absorption spectrum of the NP is accurately reproduced in the experimental range. Here we describe the methodology and we obtain the ε(<i>E</i>) of CdSe and CdS NPs of selected sizes from published data sets.