PbSe Core, PbSe/PbS and PbSe/PbSexS1-x Core-Shell Nanocrystal Quantum Dots: Properties and Applications

E. Lifshitz, A. Kigel, M. Brumer, L. Etgar, V. Kloper, M. Bashouti, A. Sashchiuk, R. Tennenbaum, M. Sirota, E. Galun, Z. Burshtein, A. Q. Le Quang, I. Ledoux-Rak, J. Zyss

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

Abstract

This chapter details the properties and applications of core-shell nanocrystal quantum dots. It shows the preparation of air-stable PbSe/PbS core-shell and PbSe/PbSexS1-x core-alloyed-shell nanocrystal quantum dots (NQD). The structural characterization showed a continuous growth of the crystallographic plans without a distinct boundary at the core-shell interface due to a close crystallographic matching. Colloidal PbSe NQDs have currently received special interest due to their unique electronic and optical properties. The bulk PbSe semiconductor has a rocksalt crystal structure and a narrow direct band gap with both valence and conduction band maxima being four-fold degenerate at the L-point of the Brillouin zone. However, the absorption and emission spectra of the core-shell structures were red shifted with respect to the relevant core samples, due to a wavefunction spilling into the low barrier shell. Furthermore, the emission spectra are shifted with respect to their absorption bands, merging from a stokes' shift into anti-stokes' shift behavior, depending on the NQDs and shell thickness and composition.

Original languageEnglish
Title of host publicationHandbook of Self Assembled Semiconductor Nanostructures for Novel Devices in Photonics and Electronics
PublisherElsevier Inc.
Pages749-772
Number of pages24
ISBN (Electronic)9780080560472
ISBN (Print)9780080463254
DOIs
StatePublished - 11 Sep 2008
Externally publishedYes

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