Design And Optimization Of Novel Counter Electrodes For Dye-sensitized Solar Cells

With the development of human society, fossil resources are of increasing depletion, accompanied by serious environmental pollution. In order to seek the path of sustainable development, inexhaustible solar energy has become a key breakthrough in solving future problems and environmental issues. As an important part of the DSSC, counter electrode (CE) has directly impact on power conversion efficiency (PCE)of the DSSCand further commercialization. The design of high-performance, low-cost CE has become a worldwide hotspot in recent years. There are two aspects of the research on CE in our work:(1) Anovel TiO2-PEDOT:PSS/PEDOT:PSS/glass CE was design and fabricated.The TiO2 dopedPEDOT:PSS layer with high catalytic can take place of Pt layer while the high conductive PEDOT:PSS layer instead FTO conductive layer, greatly reducing the cost of the battery. The novelCE was prepared successfully, and the DSSC based on it has a good performance. The PCE of the DSSC with novel CE is 4.67%, which achieved 93% efficiency of Pt-based DSSC (5.11%).(2) The fabrication of TiO2-PEDOT:PSS/PEDOT:PSS/plastic CE was based on the preparation of novel TiO2-PEDOT:PSS/PEDOT.PSS/glass CE. The flexible ITO-PEN substrates were used to take place of FTO or glass in order to achieve roll-to-roll fabrication. The maximum PCE of new device with flexible CE was 4.50%. By further optimization, such as adjusting the annealing temperature on the CE, weight ratio of P25, the efficiencies of solar cells can be further improved.Finally, mesoporous anodic aluminum oxide membranes were prepared by electrochemical deposition method, and aluminum nanopits were achieved after corrosion of aluminum oxide membranes. Aluminum nanopits have strong light scatter properties which can enhance the light absorption of semiconductor and improve the PCE of solar cells.Since aluminum film has good mechanical flexibility and low-cost, it makes that the special aluminum substrate are expected to become one of the best substrate for new generation of flexible solar cells...