A Re-Examination of the Size-Dependent Absorption Properties of CdSe Quantum Dots

Jasieniak, J, Smith, L, Van Embden, J, Mulvaney, P and Califano, M 2009, 'A Re-Examination of the Size-Dependent Absorption Properties of CdSe Quantum Dots', Journal of Physical Chemistry C, vol. 113, no. 45, pp. 19468-19474.


Document type: Journal Article
Collection: Journal Articles

Title A Re-Examination of the Size-Dependent Absorption Properties of CdSe Quantum Dots
Author(s) Jasieniak, J
Smith, L
Van Embden, J
Mulvaney, P
Califano, M
Year 2009
Journal name Journal of Physical Chemistry C
Volume number 113
Issue number 45
Start page 19468
End page 19474
Total pages 7
Publisher American Chemical Society
Abstract We investigate the size-dependent optical absorption coefficients of CdSe nanocrystals at both the band-edge and high within the absorption profile. The absorption properties in both of these regions must be selfconsistent to ensure accuracy of the measured coefficients. By combining transmission electron microscopy and inductively coupled plasma-optical emission spectroscopy, we map out the optical absorption properties and establish reliable size-dependent band-edge calibration curves. The measured absorption properties are compared to a simple 0D confinement model, to classical theory based on light absorption by small particles in a dielectric medium and to state-of-the-art atomistic semiempirical pseudopotential modeling. The applicability of these newly established calibration curves is demonstrated by analyzing the nucleation and growth kinetics of CdSe nanocrystals in solution.
Subject Mechanical Engineering not elsewhere classified
Keyword(s) SEMICONDUCTOR NANOCRYSTALS
EXTINCTION COEFFICIENT
SURFACE STOICHIOMETRY
STIMULATED-EMISSION
OPTICAL-PROPERTIES
CROSS-SECTION
SOLAR-CELLS
NUCLEATION
GROWTH
CDTE
DOI - identifier 10.1021/jp906827m
Copyright notice © 2009 American Chemical Society
ISSN 1932-7447
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