Synthesis And Characterization Of Surface Self-assembled Molecules

The organic field effect transistor has the advantages of wide material sources,compatibility with flexible substrates,low-temperature processing,high-volume production,low cost,small size,light weight,low power consumption,and good thermal stability,so it has a very bright application prospects in low-cost,large-area,flexible circuits.In order to obtain high performance organic field effect transistors,designing and developing new organic semiconductor layer materials is a key factor.In order to achieve this goal,the key is to control the solid state structure of the molecule.It is necessary to constantly change the molecular structure.C-HBC organic semiconductor materials have very good film forming properties due to their good self-assembly properties.So they can be used in organic field effect transistors.Polycyclic aromatic hydrocarbons are nice material in organic semiconductors due to their excellent performance in electronic devices.Polycyclic aromatic hydrocarbons can be classified into two types,planar and non-planar,depending on their morphology.Compared with the planar polycyclic aromatic hydrocarbons,the distorted structure makes the material have better self-assembly performance,which can make it arrange very well;then,this non-planar structure leads to the diversification of the contact between the molecules in the crystal thin film and the polycrystalline thin film.Thereby it can improve the charge transport performance of the organic-based device;in addition,in addition,the non-planar structure of these aromatic hydrocarbons can be well-matched for substances with convex structures such as fullerenes,providing a route for the separation and purification of fullerenes.The research work of this dissertation is mainly based on non-planar hexa-benzopyrene?c-HBC?.The main research content is as follows:The first part of the article mainly introduces the research progress of organic field effect transistors,describing the structure,working principle,and applications of the devices,and also focuses on the research status of organic semiconductor materials.The second part of the article mainly describes the synthesis of diolefin HBC,and it successfully combines silicon wafers with trichlorosilane and Karstedt catalysts.Due to its good self-assembly properties,it can be combined with silicon wafers in an orderly manner,so it can be used as a guide in organic semiconductor materials on the surface.From our previous studies,we found that the distorted structure of our c-HBC molecules can form complementary complexes well with C₆₀,so the combination with silica gel can also be used for the separation of C₆₀ and C₇₀.The third part of the article mainly describes the synthesis of double U-shaped HBCs.In order to obtain the expanded c-HBC compounds,the sequence of the reaction was changed to getting the optimizing experimental scheme,and different side chains were introduced.The fourth part of the article mainly describes the synthesis of Z-type c-HBC polymer.In order to obtain better performance organic semiconductor materials,multiple single molecules are bound together by coupling.