Improving The Efficiency Of Organic Solar Cells Using Nanoparticles

Nowadays as energy shortage becoming a serious problem, human being are paying more and more attention to the development and utilization of solar energy. Organic solar cells with the advantages of easy to get, cheap, simple preparation technique, environmental stability and flexible, have great potential in application. But the low power conversion efficiency has been the bottleneck for further development. Scientists from all over the world are focusing on how to improve the efficiency of organic solar cell. At the same time, nanomaterials, especially gold nanoparticles, with their unique optical characteristics surface plasmon resonance effect, received extensive attention in recent years.In this thesis, the optical properties of gold nanoparticles were applied in organic solar cell system. A new way that made use of the optical properties of nanomaterials to improve the efficiency of organic solar cells was proposed and studied in detail.Organic solar cells with MEH-PPV:PCBM/P3HT:PCBM as photosensitive layer were studied respectively. First, gold nanospheres (Au NSs) were added to the buffer layer. The impact of different particle sizes and different particle concentrations were studied, and proved that this method could work in photovoltaic devices with different materials, Then, a new coating method PEG coating method was proposed. The stability of Au NS was improved with PEG coating layer. And it also had both water soluble and oil soluble characteristics after being coated; At last,Au NSs coated with PEG were added into the photosensitive layer and the different particle concentrations were studied.