| Growing global energy consumption, which has resulted in serious environmental issues, is impelling the requests and investigations about clean and renewable energy resources for development of a sustainable society. Solar energy, as a clean and continual energy sources, compared with traditional fossil fuel energy,provides a good choice for the development.Converting solar energy directly into electricity is the most feasible technology. Perovskite solar cells (PSC), as a new generation of sustainable photovoltaic devices, have the property of low cost, easy processing and environmental benign. Based on report of the National Renewable Energy Laboratory, organic-inorganic hybrid materials has become the most hot topic in the word.In these materials, organic-inorganic hybrid perovlsite is the core object of study.The certified PCE of perovskite solar cells increased gradually from 12 to 22% in a short time which has approached to the monocrystalline silicon solar cells. Now most research group in the word trying to improve the PCE of perovskite solar cells by research and development new type of perovskite materials, improve the layer of the light absorption (layer of perovskite crystal ), change the microcosmic structure of activity layer and the most important research direction is that modified the mesoporous metal oxide layer, perovskite layer, hole-transporting material layer(HTM) by using some organic materials. In our article, to improve the performance of PSC devices, interfacing engineering a very important method was used to improve performance of TiO2 which could conduct the electric charge. In order to understanding the relationship between structure and properties about small molcures,we have designed and prepared some series porphyin dyes, investigated their performance in the following areas:(1) An overview of the renewable energy resources, solar energy, solar cells, dye-sensitized solar cells and photosensitizers.(2)Based on the thought and idea of Dye-sensitized solar cells, study the relationship between small molecules of D-π-A type and cells’ properties. In these chapter we designed and synthesized 4-(2-aminoethyl)benzoic acid, and using organic acid as an electron transmission and anchoring group.The performances of their sensitized solar cells have been investigated by optical, photovoltaic, and electrochemical methods. The the result show that the shorter chain of amino the batter(3)four benzoic acid derivatives with D-π-A structure were introduced into the interfaces of porous TiO2 layer and the perovskite layer. The performance of molecule-modified perovskite solar cells (PSC) was investigated by electrochemical,optical, photovoltaic essays. These small D-π-A molecules could improve their interfacial properties and electron transportation between the layers of perovskite and TiO2 semiconductor of PSC solar cells. Their power conversion efficiency (PCE)depends on both the D-π-A structure and anchoring groups. The additive concentration of HI affects the formation of perovskite and dye loading process as well. The PCE of cells modified with 4-aminosalicylic acids rises evidently 29.7%owing to tridentate anchoring groups. The electrochemical impedance spectroscopies revealed that these small conjugated molecules play a crucial role in the electron transportation of cell and the structure of interfaces... |
PDF Full Text Request