  With the increasing energy crisis and the prevalent concept of green
sustainability, quantum dot materials have become a hot spot in the academic
and industrial fields of chemistry. Due to unique, tailor-made photovoltaic
properties based on marked quantum-confined effects, it's necessary to identify
the QD-based charge transfer process connected with a lifetime of stimulated
excitons. Additionally, inorganic nanoparticles with a continuum of electron
states contribute to the consistency between electron dynamics and their
function through complexation with QDs. Ultrafast spectroscopy can be widely
used in this system, the most typical of which is the time-resolved transient
absorption spectroscopy, especially on a femtosecond or picosecond timescale.
In this paper, we used the ZnSe/CdS core-shell quantum dot as the donor, and
the TiO2 film as the metal oxide molecule as the acceptor, through steady-state
and transient absorption techniques. Within, the electron transfer and related
processes between the two composite systems were explored, and the relationship
between the electron transfer rate constant (kBET) and particle size and QD
core size was further studied. Through the research content of this paper, it
is hoped to provide materials for quantum dot sensitization devices with more
controllable features.
