Investigation Of Cracked Template Electrode For Dye-sensitized Solar Cells

With the trend of miniaturization and flexibility of electronic terminals,the Internet of things and wearable devices are booming,which puts forward the requirements for flexible transparent conductive thin films and flexible solar cells.The widely used ITO can not meet the development requirements due to its brittleness and cost,while the existing flexible photovoltaic has high demands for light or it is difficult to maintain photoelectric stability in the environment.Dye-sensitized solar cells（DSSCs）are considered as an effective way to solve the self-powering problem of flexible terminals because of their relatively low cost,simple preparation process and good environmental stability,which can work normally even in poor illumination environment.The flexibility of dye-sensitized solar cells is easier to achieve than other kinds of cells,with emphasis on the flexibility of the electrodes on both sides.This work refine the process parameters of self-assembly method with cracks,and the flexible grid electrode was prepared by electroless plating method,which is suitable for the backlight dye-sensitized solar cells to replace transparent conductive oxides（TCO）and platinum.Titanium foil is used as the photo-anode base instead of TCO to further reduce costs.The main contents of this dissertation are summarized as follows:1.The crack precursor solution was prepared with different diluents and acrylic resin emulsion,and then the film was spun.The difference of crack modes were compared,and ethanol was the best.Using ethanol as diluent to investigate the effects of rotating speed and drying temperature on the average crack width,average crack spacing and crack area ratio.A method was proposed to control the crack width and spacing independently to control the crack area ratio,and the empirical formula was summarized,The mechanism of crack growth is also analyzed.2.By depositing copper layer on the crack template,the preparation of PET-based flexible copper mesh electrodes was achieved.Comparing and analyzing the advantages and disadvantages of electroless plating and magnetron sputtering,it is found that electroless plating has low requirements for equipment,low cost of growth and timeconsuming,but poor conductivity and filter problems.3.Titanium dioxide film with high surface roughness was prepared on titanium foil by high temperature sintering method for photoanode,and copper sulfide nanosheet clusters with large specific surface area were successfully prepared by low temperature solvent thermal reaction for counter electrode,which were assembled with N719 dye and iodine-based electrolyte to form backlight dye-sensitized solar cells.The performance of solar cells was tested and the effects of electroless plating and magnetron sputtering were analyzed.