Optical Absorption of Proton Irradiated Colloidal CdSe/ZnS Core/Shell Nanocrystals

The excitonic transition observed in the optical absorption spectra of CdSe/ZnS core/shell nanocrystals is investigated as a function of 2 MeV proton irradiation dose. Samples of three different nanocrystal diameters were prepared by embedding the nanocrystals into a UV curable resin. The integrated...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2010-10, Vol.57 (5), p.2929-2932
Main Authors: Narsingi, K Y, Shibin Li, Manasreh, M O, Weaver, B D
Format: Article
Language:English
Subjects:
Absorption
Cadmium selenides
Excitation
Excitation spectra
Excitons
Infrared photodetector
Intermetallics
Irradiation
Nanocrystals
Photovoltaic cells
Proton irradiation
Protons
quantum dot
Radiation effects
rapid thermal annealing
Shells
Temperature measurement
Zinc sulfides
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Summary:The excitonic transition observed in the optical absorption spectra of CdSe/ZnS core/shell nanocrystals is investigated as a function of 2 MeV proton irradiation dose. Samples of three different nanocrystal diameters were prepared by embedding the nanocrystals into a UV curable resin. The integrated area of the exciton peak is obtained after irradiating the samples with several irradiation fluences ranging between 1.0×10 13 cm -2 to 9.5×10 15 cm -2 . The results indicate that nanocrystals with larger diameter (~4.40 nm) are more irradiation tolerant while the excitonic transition is completely degraded in nanocrystals with diameter of ~2.10 nm.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2010.2062199