QUANTUM-WELLS WITHIN QUANTUM DOTS, A CDS HGS NANOHETEROSTRUCTURE WITHGLOBAL AND LOCAL CONFINEMENT/

Citation
A. Mews et A. Eychmuller, QUANTUM-WELLS WITHIN QUANTUM DOTS, A CDS HGS NANOHETEROSTRUCTURE WITHGLOBAL AND LOCAL CONFINEMENT/, Berichte der Bunsengesellschaft fur Physikalische Chemie, 102(10), 1998, pp. 1343-1357
Citations number
68
Categorie Soggetti
Chemistry Physical
Journal title
Berichte der Bunsengesellschaft fur Physikalische Chemie
ISSN journal
00059021 → ACNP
Volume
102
Issue
10
Year of publication
1998
Pages
1343 - 1357
Database
ISI
SICI code
0005-9021(1998)102:10<1343:QWQDAC>2.0.ZU;2-0
Abstract
Semiconductor nanocrystals prepared by methods of wet chemistry are si milar to MBE grown quantum dots where the mobility of the charge carri ers is reduced to zero dimensionality. In this paper we summarize the physics of a unique system in which the charge carriers are locally co nfined within a heterogeneous quantum dot. With high resolution electr on microscopy we will show that epitaxial growth ot atomic layer preci sion is possible by methods of solution chemistry leading to CdS quant um dots with embedded HgS quantum wells (QDQWs). The photophysics of t his' system is investigated by time-correlated single photon counting, transient differential absorption and fluorescence line narrowing spe ctroscopies. The results reflect the very complex electronic structure of this new kind of matter which can be explained by an extended effe ctive mass approach.