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With the rapid development of industry and technology, human’s life become better and better. However, the non-renewable energy sources (coal, oil, natural gas) are sharply decreasing, so people need to find other source replace non-renewable energy sources. Thereby lots of new energy sources appear, such as solar, wind, nuclear and so on. Among them, because solar energy is inexhaustible, in recent years solar cells become the focus of the study.Solar cells could be divided into inorganic and organic in material. Inorganic cells are mature, but it has some shortcomings, like high cost, complicated process and so on. Therefore, people begin study organic solar cells, which have many advantages such as low cost, simple production process and so on. Organic solar cells could be divided into small molecule and polymer in material, and polymer solar becomes one of the focuses in the field.This thesis focuses on the mechanism of polymer solar cells and experiments in order to increase the power conversion efficient.The main contents are as follows:1. Through studying the loss mechanism, polymer solar cells based on MEH-PPV:PCBM as active layer was studied. The optimal blend ratio and solvent were found.2. The performance of polymer solar cells based on PEDOT:PSS as anode modification layer was studied.3. The performance of polymer solar cells based on magnesium oxide(MgO) as cathode buffer layer was studied.The main results are as follows:1. Different blend ratio could directly affect the separation of donor and acceptor and short-circuit current density and power conversion efficient, optimal ratio is 1:4 and Power conversion efficient is up to 2.758%.2. The devices by different solvent had different performance, Chlorobenzene is best.3. Though PEDOT:PSS as anode modification layer could increase performance, absorption coefficient would decrease because it block sunlight.4. By drawing the study on organic light-emitting device (OLED), MgO could be the cathode buffer layer and the potential well structure of MgO and BCP could effectively block hole while the cathode could collect the electron.
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