Quantum-confined electron transitions in CdSe nanocrystals

D. S. Ginger*, A. S. Dhoot, C. E. Finlayson, N. C. Greenham

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Proceeding (Non-Journal item)


We present quasi-steady-state photoinduced absorption measurements on thin films of colloidal CdSe nanocrystals. We observe an intense, size-dependent absorption peaking in the mid-infrared when the samples are irradiated with visible light. The absorption is accompanied by a bleach in the visible near the position of the first excitonic absorption and persists with a lifetime of milliseconds at room temperature. We characterize the lifetime of the electron state and its cross-section. We attribute this feature to the 1S-1P transition of a delocalized electron. We report a bleaching of the first excitonic transition in electrically excited nanocrystal-based diode structures, and attribute it to charging of the 1S electron state.

Original languageEnglish
Title of host publicationSemiconductor Quantum Dots II
Publication statusPublished - 2001
EventSemiconductor Quantum Dots II - Boston, MA, United States of America
Duration: 27 Nov 200030 Nov 2000

Publication series

NameMaterials Research Society Symposium - Proceedings
ISSN (Print)0272-9172


ConferenceSemiconductor Quantum Dots II
Country/TerritoryUnited States of America
CityBoston, MA
Period27 Nov 200030 Nov 2000


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