Synthesis Of Organic Conjugated Polymer Covalently Grafted Graphene And Research On Solar Cells

As a common photoelectric conversion device,solar cell can store and use sunlight,so it can alleviate the problem of non-renewable energy shortage to a certain extent,which has attracted the attention of researchers.At the present stage,although the photoelectric conversion rate of the inorganic solar cells with high-purity silicon as the material has reached 21%,due to the high cost,serious environmental pollution and low product qualification rate,scientists have turned their attention to the organic solar cells.Organic solar cells have the advantages of low cost,easy preparation and large-scale production.At present,organic solar cells have achieved 18%photoelectric conversion.However,organic solar energy also has shortcomings:first,the power conversion efficiency of the polymer solar cells is lower than the inorganic solar cells;second,the cycle stability of the battery is poor.Graphene has the advantages of high transmittance,easy to adjust band gap and good flexibility.In order to solve the problem about organic solar cell,researchers introduced graphene and its derivatives into organic solar materials.The introduction of graphene and its derivatives plays an important role in the research and development of materials in organic solar cell.The main content of this paper is to study and explore the synthesis and application of covalently grafted graphene.We synthesized a new graphene grafted material by Stille coupling method,and found that the new graphene grafted material can improve the dispersion of graphene composite in organic solvent,and the optical and electrical properties of the material can meet the requirements of ternary organic solar cell hybrid materials.Then we applied the new graphene grafted material to the ternary organic solar cell,and analyzed the influence of the new graphene grafted material on the device performance.In the first chapter introduced that the application and development of graphene and its derivatives in organic solar cells.In the second chapter,the preparation of graphene and brominated graphene is described,and the graphene oxide,graphene and brominated graphene are tested and analyzed.In the third chapter,the synthesis of D-π-A organic conjugated polymer and its covalently grafted graphene material with fluorine ring as donor is described,and a series of tests are focused on the new graphene grafted material.It is found that the new graphene grafted material can meet the requirements of ternary organic solar cell materials in optical and electrical properties.Finally,it is applied to the organic solar cell devices,and the corresponding detection and analysis are carried out to realize the application of the new graphene graft material in the organic solar cell.In the fourth chapter described the synthesis and characterization of D-π-A organic conjugated polymer with carbazole as donor and its grafted material with covalently grafted graphene.