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Quantum-Confined Electron Transitions in CdSe Nanocrystals

Published online by Cambridge University Press:  17 March 2011

D. S. Ginger ,
A. S. Dhoot ,
C. E. Finlayson  and
N. C. Greenham
D. S. Ginger
Affiliation:
Cavendish Laboratory, Madingley Road, Cambridge, CB3 0HE, U.K.
A. S. Dhoot
Affiliation:
Cavendish Laboratory, Madingley Road, Cambridge, CB3 0HE, U.K.
C. E. Finlayson
Affiliation:
Cavendish Laboratory, Madingley Road, Cambridge, CB3 0HE, U.K.
N. C. Greenham
Affiliation:
Cavendish Laboratory, Madingley Road, Cambridge, CB3 0HE, U.K.
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Abstract

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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 642: Symposium J – Semiconductor Quantum Dots II , 2000 , J2.5.1
Copyright
Copyright © Materials Research Society 2001

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References

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