© Copyright 1999 by the American Chemical Society
VOLUME 103, NUMBER 32, AUGUST 12, 1999
LETTERS Multiple-Exponential Electron Injection in Ru(dcbpy)2(SCN)2 Sensitized ZnO Nanocrystalline Thin Films John B. Asbury, YongQiang Wang, and Tianquan Lian* Department of Chemistry, Emory UniVersity, Atlanta, Georgia 30322 ReceiVed: May 19, 1999; In Final Form: June 28, 1999
We have studied the electron injection dynamics of Ru(dcbpy)2(SCN)2 sensitized ZnO nanocrystalline thin films by femtosecond mid-IR absorption spectroscopy. Upon 400 nm excitation of the sensitizer, nonexponential electron injection kinetics from the sensitizer MLCT excited state to ZnO were observed by probing the absorption of injected electrons in the 2000 to 1900 cm-1 region on the
