Determination of the quantum dot band gap dependence on particle size from optical absorbance and transmission electron microscopy measurements

Journal article
(Original article)


Publication Details

Author(s): Segets D, Lukas M, Klupp Taylor R, Scheele M, Zheng H, Alivisatos P, Peukert W
Journal: Acs Nano
Publisher: American Chemical Society
Publication year: 2012
Volume: 6
Journal issue: 10
Pages range: 9021-9032
ISSN: 1936-0851
Language: English


Abstract


This work addresses the determination of arbitrarily shaped particle size distributions (PSDs) from PbS and PbSe quantum dot (QD) optical absorbance spectra in order to arrive at a relationship between band gap energy and particle size over a large size range. Using a modified algorithm which was previously developed for ZnO, we take only bulk absorption data from the literature and match the PSDs derived from QD absorbance spectra with those from transmission electron microscopical (TEM) image analysis in order to arrive at the functional dependence of the band gap on particle size. Additional samples sized solely from their absorbance spectra with our algorithm show excellent agreement with TEM results. We investigate the influence of parameters of the TEM image analysis such as threshold value on the final result. The band gap versus size relationship developed from analysis of just two samples lies well within the bounds of a number of published data sets. We believe that our methodology provides an attractive shortcut for the study of various novel quantum-confined direct band gap semiconductor systems as it permits the band gap energies of a broad size range of QDs to be probed with relatively few synthetic experiments and without quantum mechanical simulations. © 2012 American Chemical Society.


FAU Authors / FAU Editors

Klupp Taylor, Robin Prof.
Professur für Nanostructured Particles
Peukert, Wolfgang Prof. Dr.-Ing.
Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik
Segets, Doris Dr.-Ing.
Exzellenz-Cluster Engineering of Advanced Materials


Additional Organisation
Exzellenz-Cluster Engineering of Advanced Materials


External institutions with authors

California State University (CSUF)
Lawrence Berkeley National Laboratory (LBNL)


Research Fields

C Photonic and Optical Materials
Exzellenz-Cluster Engineering of Advanced Materials
A1 Functional Particle Systems
Exzellenz-Cluster Engineering of Advanced Materials


How to cite

APA:
Segets, D., Lukas, M., Klupp Taylor, R., Scheele, M., Zheng, H., Alivisatos, P., & Peukert, W. (2012). Determination of the quantum dot band gap dependence on particle size from optical absorbance and transmission electron microscopy measurements. Acs Nano, 6(10), 9021-9032. https://dx.doi.org/10.1021/nn303130d

MLA:
Segets, Doris, et al. "Determination of the quantum dot band gap dependence on particle size from optical absorbance and transmission electron microscopy measurements." Acs Nano 6.10 (2012): 9021-9032.

BibTeX: 

Last updated on 2018-08-12 at 20:50