Study On The Effect Of Composition Regulation On The Structure And Properties Of Organic-Inorganic Perovskite

The generation and separation of photoexcited states to form stable and long-lived charge carriers,and the transfer and transport of carriers are the core processes related to several important research fields and emerging technologies,such as natural photosynthesis,solar photovoltaic devices,photocatalysis and organic semiconductor optoelectronic devices.Organic-inorganic composite perovskite material(OIHPs)has highly designable structure,controllable scale and diversity of component selection,which provides a broad platform for the study of charge separation and transport between multi-components.However,for LD OIHP,the need to dissociate excitons with large binding energy and insulating long-chain organic ligands hindering charge transfer are the main challenges hindering the generation of free carriers at room temperature.The introduction of larger size ?-conjugated organic cations can not only effectively prevent the erosion of water and oxygen,so as to stabilize the crystal structure of OIHPs.The optoelectronic properties of different optoelectronic devices can also be regulated by changing the crystal structure and regulating the electronic interaction between components to achieve the needs of different optoelectronic devices.In addition to organic cations,halogen atoms in the inorganic framework affect bonding and crystal structure by changing electronegativity and atomic radius,thus providing an additional convenient means to regulate the interaction between components.The main contents of this thesis are as follows:1.Halogen-manipulated interfacial charge transport of ?-conjugated molecule-lead halide hybridsFour kinds of single crystals(C23H26N3O4)Pb(I1-nBrn)3(0