Electron transfer in quantum-dot-sensitized ZnO nanowires: ultrafast time-resolved absorption and terahertz study.
Photoinduced electron injection dynamics from CdSe quantum dots to ZnO nanowires is studied by transient absorption and time-resolved terahertz spectroscopy measurements. Ultrafast electron transfer from the CdSe quantum dots to ZnO is proven to be efficient already on a picoseconds time scale (τ = 3-12 ps). The measured kinetics was found to have a two-component character, whose origin is discussed in detail. The obtained results suggest that electrons are injected into ZnO via an intermediate charge transfer state.
Department of Chemical Physics, Lund University, Box 124, 22100 Lund, Sweden.
Karel
K
Žídek
Kaibo
K
Zheng
Carlito S
CS
Ponseca
Maria E
ME
Messing
L Reine
LR
Wallenberg
Pavel
P
Chábera
Mohamed
M
Abdellah
Villy
V
Sundström
Tõnu
T
Pullerits