Highly Efficient Polymer Solar Cells Based On The Structure Of Metal Resonant Microcavity

In the world, the energy problem is the source of conflict between different countries. Due to the traditional energy source drying up, more and more people start to research and use solar energy which is well-resourced and environmental friendly. In recent years, polymer solar cells has become the focus of development in the field of solar cells for its low-cost, flexibility and lightweight.The paper elaborates the classification of solar cells, development history and status of polymer solar cells, the basic principle of solar cells, important parameters and the cell structures. In traditional polymer solar cells, indium tin oxide (ITO) is exclusively used as transparent electrodes due to its excellent transparency. However, ITO transparent electrodes have some drawbacks such as brittle nature, lower conductivity compared to metal electrodes and high costs due to scarcity of the indium element. Therefore, in the paper we study and use the multi-layer structure of WO3/Au/WO3 as the transparent electrode to replace the traditional ITO electrode. The paper presented a new Au-Al mental microcavity structure of polymer solar cells which used in P3HT:ICBA and PCDTBT:PC7oBM two kinds of devices, and completed the design of structure and the preparation. By testing the prepared cells, the device with microcavity structure can enhance the Jsc and the PCE. By stimulating the performance of devices with transfer matrix method (TMM), the stimulation results matched with testing results. It proved that the experiment design reasonable and effective.The Au-Al metal microcavity structure solar cells can reduce the production cost, and can improve the efficiency significantly. It has a reference value for the practical application and commercial production of polymer solar cells.