Study on Transient Spectrum Based on Charge Transfer of Semiconductor Quantum Dots

With the increasing energy crisis and the concept of green sustainable development, quantum dot materials have become a hot spot in the academic and industrial fields of chemistry because of their unique characteristics. Ultrafast spectroscopy can be widely used for the dynamic behavior of various carriers and the relaxation process of materials in the picosecond or femtosecond time scale. The most typical of these is the time-resolved transient absorption spectroscopy, which combines steady-state spectral absorption techniques with transient pump-detection techniques for a wide range of applications. Based on this, this paper uses the femtosecond pulse as the excitation source, the ZnSe/CdS core-shell structure quantum dot as the donor, and the TiO2 film as the metal oxide molecule as the acceptor, through steady-state and transient absorption techniques, 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.