Long-lived delocalized electron states in quantum dots: A step-scan Fourier transform infrared study

Authors
Shim, M Shilov, SV Braiman, MS Guyot-Sionnest, P
Citation
M. Shim et al., Long-lived delocalized electron states in quantum dots: A step-scan Fourier transform infrared study, J PHYS CH B, 104(7), 2000, pp. 1494-1496
Citations number
23
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF PHYSICAL CHEMISTRY B
ISSN journal
15206106 → ACNP
Volume
104
Issue
7
Year of publication
2000
Pages
1494 - 1496
Database
ISI
SICI code
1520-6106(20000224)104:7<1494:LDESIQ>2.0.ZU;2-5
Abstract
Visible light-induced IR absorption in colloidal CdSe quantum dots is obser ved by step-scan FTIR spectroscopy. Size dependence and the effect of surfa ce modification are investigated. The introduction of surface hole trap sta tes enhances and prolongs the IR absorption in photoexcited quantum dots. O ur measurements reveal long-lived (>1 ms) delocalized electron states in 6 nm average diameter dots capped with thiocresol.