Time resolved photoelectrochemistry with size-quantized PbS adsorbed on gold

The electronic structure and decay dynamics of a long-lived photoexcited st ate in PbS quantum dots (QD), adsorbed as a monolayer on a gold electrode, were studied by a time resolved photoelectrochemical technique, intensity-m odulated photocurrent spectroscopy (IMPS). By scanning the Fermi level of t he gold, we found that the excited state consists of an electron in a deep trap and a hole in the HOMO. The rate constants of photoinduced electron tu nneling between the dots and the electrode and between the dots and the ele ctrolyte were determined. It was found that the trapped charge carrier has a lower tunneling probability than the free charge carrier, indicating that distance is the determining parameter for electron tunneling. (C) 2000 Els evier Science S.A. All rights reserved.