Study Of The Effect Of Nanoparticles Doping On Polymer Solar Cells

Solar energy is one kind of green renewable energy without pollution and transportation. How to utilize it effectively becomes particularly important as the fossil fuels is being run out and human needs more and more energy. Solar cells are devices that convert solar energy into electric energy directly, and considered to be the best way to take use of solar energy. Presently, most of the solar cells for commercial application are inorganic ones made of Si or other inorganic material. On one hand, inorganic solar cells have higher power conversion efficiency with matured technique; on the other hand, the productive process of inorganic solar co nsumes a lot of money and energy, and this is contrary to our original intention. As a result, more and more researchers focus on organic solar cells with great advantage of low-cost, lightweight, large area device, solution processing capability and mechanical flexibility. But the poor power conversion efficiency makes PSCs still faraway from commercial application. So finding the way to increase the power conversion efficiency of organic solar cells effectively becomes the key point of researchers and the goal of this article. This article includes the following parts:1. We reviewed the history of the development of solar cells briefly, and introduced their classification, basic principle and main parameters of polymer solar cells particularly.2. In particular, we introduced the up-conversion effect as well as surface plasmonic resonances effect and their application in polymer solar cells.3. We introduced the preparation and characterization（TEM, AFM and absorption spectrum）of NaYF₄ nanoparticles and Au nanoparticles with different shape and size.4. The main part of experiment:（1） The application of up-conversion material of NaYF₄ nanoparticles in polymer solar cells. NaYF₄ nanoparticles were blended into P3HT: PC61 BM and PSBTBT: PC61 BMsolution respectively, and polymer solar cells using these solutions as active layer material were fabricated. Performance test of fabricated devices with the structure of ITO/TiO₂/Donor: PC61BM: NaYF₄ NPs /Mo O3/Ag were also carried out. The results demonstrated that the doping of NaYF₄ nanoparticles improved the device performance remarkably. The power conversion efficiency（PCE） of devices with P3HT:PC61BMand PSBTBT:PC61BM as active layer improved 22.3% and 24.2% respectively. Moreover, the absorption spectra of active layers with and without NaYF₄ nanoparticles show that the introduction of NaYF₄ nanoparticles increased the light absorption effectively.（2） The application of Au nanorods（Au NRs） in cathode buffer layer of polymer solar cells. Au NRs of different concentrations were doped into the cathode buffer layer of polymer solar cells, and devices with the structure of ITO/Ti O 2（Au NRs） /PCDTBT:PCB71M/Mo O3/Ag were fabricated and done the performance testing. The testing results showed that at the doping concentration of 1.5wt%, the best device performance was obtained with a PCE of 6.72%, which is 15.5% higher than that of the control device without Au NRs doped.（3） The application of Au NRs in active layer of polymer solar cells. Different-concentration Au NRs were blended into PCDTBT : PCB71 Msolution and devices with the structure of ITO/TiO₂/PCDTBT:PCB71M:Au N Rs/Mo O3/Ag were fabricated and characterized. At the doping concentration of 1.5wt%, the best device performance was obtained with a PCE of 6.83%, which is 18.9% higher than that of the control device without Au NRs doped.5. We carried out comprehensive analysis to wards the experimental results and gave the theoretical for the improvement of device PCE.6. Summarize the whole article and look into the distance.