Effects of surface ligands on the charge memory characteristics of CdSe/ZnS nanocrystals in TiO2 thin film

Kang, Seung-Hee; Kumar, Ch. Kiran; Lee, Zonghoon; Radmilovic, Velimir; Kim, Eui-Tae
November 2009
Applied Physics Letters;11/2/2009, Vol. 95 Issue 18, p183111
Academic Journal
Charge memory characteristics have been systematically studied based on colloidal CdSe/ZnS nanocrystal quantum dots (QDs) embedded in ∼50 nm-thick TiO2 film. Ligand-capped QDs showed negligible electron charging effect, implying that the electron affinity of QDs was significantly decreased by surface dipole layer surrounding QDs. In contrast, the hole charging was affected by the carrier injection blocking effect of the surface ligands. Efficient electron and hole charging characteristics were realized by removing the surface ligands via H2 plasma treatment.


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