Quantum-confined electron transitions in CdSe nanocrystals

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

*Awdur cyfatebol y gwaith hwn

Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddTrafodion Cynhadledd (Nid-Cyfnodolyn fathau)

Crynodeb

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.

Iaith wreiddiolSaesneg
TeitlSemiconductor Quantum Dots II
TudalennauJ2.5.1-J2.5.6
Cyfrol642
StatwsCyhoeddwyd - 2001
DigwyddiadSemiconductor Quantum Dots II - Boston, MA, Unol Daleithiau America
Hyd: 27 Tach 200030 Tach 2000

Cyfres gyhoeddiadau

EnwMaterials Research Society Symposium - Proceedings
ISSN (Argraffiad)0272-9172

Cynhadledd

CynhadleddSemiconductor Quantum Dots II
Gwlad/TiriogaethUnol Daleithiau America
DinasBoston, MA
Cyfnod27 Tach 200030 Tach 2000

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