|AVS 54th International Symposium|
|Electronic Materials and Processing||Monday Sessions|
|Session:||Semiconductor Nanostructures for Electronics and Optoelectronics I|
|Presenter:||K.M. Whitaker, University of Washington|
|Authors:||K.M. Whitaker, University of Washington
D.R. Gamelin, University of Washington
|Correspondent:||Click to Email|
Conduction band electrons in colloidal ZnO quantum dots have been prepared photochemically. This presentation will describe the use of electron paramagnetic resonance (EPR) spectroscopy to probe the spins of these conduction band electrons. Spectroscopic g-values for 3-7 nm diameter nanocrystals containing single S-shell conduction band electrons have been determined. Room-temperature ensemble spin dephasing times for these electrons were estimated from EPR linewidth analysis. The effects of electron-nuclear hyperfine interactions on T2* were investigated systematically by varying the concentration of 67Zn (I = 5/2) ions synthetically. A clear relationship between T2* and nuclear spin concentration was observed and will be discussed.