Synthesis And Photoelectric Properties Of PbS Quantum Dots

In this thesis, PbS quantum dots (QDs) with mean particle size from 4 nm to 15 nm were synthesized with different methods. Meanwhile, the reaction conditions which acting on the particle size of PbS QDs were also studied in the paper. Furthermore, PbS quantum dots were used as sensitizer to fabricate PbS quantum dots-sensitized solar cell.The main three results included in this dissertation are summarized in the following:1,Monodispersion PbS QDs with mean particle size from 4nm to 15nm were fabricated by the colloidal chemistry method using organic sulfide and inorganic sulfide as precursor respectively, in which the particle size distribution is controlled by the processes of fast nucleation at high temperature and slow growth at low temperature. The particle size, morphology and crystalline structures of PbS quantum dots were characterized by TEM, XRD, Vis-NIR spectra, and Photoluminescence.2,Nanocrystalline TiO2 porous thin film and nanocrystalline SnO2 porous thin film were propertied with docter-blad method. Meanwhile, The morphology and crystalline structures were Characterized.3,PbS QDs were connected to the nanocrystalline TiO2 porous thin film and nanocrystalline SnO2 porous thin film with the organic molecules double functional groups to form Photoelectrodes which is used to assemble the PbS QDs sensitized solar cell.Furthermore, The light to electricity conversion efficiency of PbS QDs sensitized solar cell was tested and analyzed.