Fabrication And Performance Research Of Polymer Solar Cells

Organic photovoltaic cells have the following advantages:low cost, light weight, mechanical flexibility, and easy fabrication; however, efficiency and stability are two main problems impeding their commercial production. Power conversion efficiency (PCE) has been increased to10%over the last decade, but instability is still one of key issues to be tackled with. Devices with the structure ITO/PEDOT:PSS/P3HT:PCBM/Ca/Al were fabricated. Effects of different drying treatments on device performance were systematically investigated. With solvent vapor drying and thermal anneal of the wet layer in the drying process, PCE of the devices was apparently improved compared to a reference device. SEM and AFM shows solvent vapor drying and thermal anneal have a greater impact on the active layer micro-structure than other treatments, leading better polymerization and orientation. This paper summarizes degradation process of organic photovoltaic cells and the influences of light, oxygen, humidity, and temperature on every layer of OSCs. Experiments on light aging of solar cell indicate that devices with different microstructure have different stability, and that solvent vapor drying and thermal annealing devices hold better stability than only thermal annealing ones.