Study Of Polymer Solar Cells Based On The Modification Of PEDOT:PSS Anode Modified Layer

In recent years, studies have shown that the polymer solar cells(PSCs) has become the focus of research at home and abroad depending on its low cost, the small proportion, easy machining, being able to flexible, and many other advantages.After years of effort, the organic polymer solar cells have improved significantly in the material, the structure of the battery and the interface design, etc. And the laboratory photoelectric power conversion efficiency(PCE) has reached 10%., however, the device stability of organic polymer solar cells has not been well solved, which is the restrict its industrialization.The reasons which influence the stability of polymer solar cells including the corrosion of PEDOT:PSS transparent electrode, decomposition of PEDOT:PSS due to absorbing water, oxidation of low work function of the electron injection layer, light degradation of organic material itself, etc. Based on the current organic polymer cells problems, this work choosing the appropriate rich sulfonic acid root organic materials to replace or modify PEDOT:PSS anode layer, which greatly improve the life and efficiency of polymer solar cells.PEDOT:PSS is a kind of commonly hole-transporting materials used in solar cells. However, PEDOT:PSS,which has strong acidity and water absorbability, will directly affect the stability of solar cells. Therefore, this study proposed the adoption of sulfonated polyether ether ketone (SPEEK) and total fluoride sulfonic acid ester (Nafion),which is rich of sulfonic acid root, to replace or modify PEDOT: PSS to improve the performance of a series of polymer solar cells.Using the sulfonated polyether ether ketone (SPEEK), total fluoride sulfonic acid ester (Nafion) as anode modification of polymer solar cells, the organic polymer solar cells shows good performance, in device structure adopting standard P3HT donor, PC6oBM receptor structure. Comparing with the PEDOT:PSS as hole transport layer of the device, the efficiency decreases, but the stability of the device is improved. In AM 1.5 G 1000 w/m2 standard light intensity, SPEEK and Nafion, the polymer solar cells get the power conversion efficiency of 3.64%and 4.01% respectively based on the P3HT donor, PC60BM receptor system. In addition,the reverse structure of polymer solar cells using Nafion as hole transport layer based on P3HT donor and PC60BM receptor system also achieved a photoelectric conversion efficiency of 3.70%.Using Nafion doped PEDOT:PSS as new hole transport layer, in standard P3HT donor, PC60BM receptor device structure systeam, not only has good stabilization and also get a higher photoelectric conversion efficiency, comparing with using standard PEDOT:PSS. Though Nafion modified doped processing, the modified film presents obvious nano-scale phase separation, and the corresponding solar cells based on P3HT donor, PC60BM receptor structure get a photoelectric conversion efficiency of 4.63% in AM 1.5 G 1000 w/m2 standard light intensity, comparing with the unmodified processing device, the efficiency has an increase of 14%. At the same time, the stable skeleton structure of Nafion membrane formed in the film, makes the stability of the solar cells device significantly improved.