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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 area of the exciton peak is obtained after irradiating the samples with several irradiation fluences ranging between 1.0×1013 cm-2 to 9.5×1015 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.