Electron and hole transfer from indium phosphide quantum dots.
Electron- and hole-transfer reactions are studied in colloidal InP quantum dots (QDs). Photoluminescence quenching and time-resolved transient absorption (TA) measurements are utilized to examine hole transfer from photoexcited InP QDs to the hole acceptor N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD) and electron transfer to nanocrystalline titanium dioxide (TiO2) films. Core-confined holes are effectively quenched by TMPD, resulting in a new approximately 4-ps component in the TA decay. It is found that electron transfer to TiO2 is primarily mediated through surface-localized states on the InP QDs.
Blackburn
J L
JL
National Renewable Energy Laboratory, Golden, Colorado 80401, USA.
Selmarten
D C
DC
Ellingson
R J
RJ
Jones
M
M
Micic
O
O
Nozik
A J
AJ