Experimental Study On Performance Optimization Of Chlorophyll Derivative Dye-sensitized Solar Cells

Solar photovoltaic power generation is an attractive,sustainable and environmentally friendly way in utilizing solar energy.Currently,in the field of solar photovoltaic technology,the dye-sensitized solar cell?DSSC?has been rapidly developed due to its low cost,simple production process,simple structure and wide range of applications.In this paper,as the research background,dye-sensitized solar cells is based on the use of chlorophyll derivatives,anthocyanins,carotenoids natural dye as a dye sensitizer,respectively.The production process of the photoanode?to N719 as a dye?,the different sensitization conditions and the different sensitization methods,affecting the photoelectric properties of DSSC,are studied on the optimization design and experimental research.The fabrication process is designed and determined under the default condition of the photoanode as the basic condition for the optimization design of the photoanode manufacturing process in this paper.And then,a single factor influence research was carried out on the active area of the photoanode,the thickness of TiO₂ film,adding scattering layer,film sintering temperature of TiO₂ film,chemical treatment method and concentration.Finally,the optimal fabrication process of TiO₂ film electrode was confirmed as follows:the active area of the photoanode is 0.4cm×0.4cm,the thickness of TiO₂ film is 19?m,and the scattering layer is added,the sintering temperature of TiO₂film electrode is T₁=525?,T₂=500?,and with 0.1 mol/L TiCl₄ aqueous solution for chemical processing.Selecting optimal TiO₂ film electrode prepared in the Lab as the photoanode and the chlorophyll derivative Chl-CuNa with best optoelectronic properties as a dye,the different sensitization conditions affecting optoelectronic properties of DSSC were studied experimentally,such as:the sensitizing dye solvent,the sensitization concentration,sensitization pH value,sensitization temperature,the time of sensitizing under the light,sensitization time,the electrode background color.The results showed that the performance of Chl-CuNa alcohol aqueous solution?the volume ratio of absolute ethanol to deionized water was 3:1?was optimal,the optimal dilution ratio of Chl-CuNa was 1:2,the best sensitization pH=8,the best sensitization temperature is30?.The sensitization effect is best in the dark environment,and the result is optimal when the electrode using a mirror backgrond.Chl-CuNa,anthocyanidins and carotenoid dyes were selected as dye sensitizers,and a single pigment dye sensitization study of photoanode was carried out.Anthocyanidins dyes?black wolfberry,blueberry,litchi pericarp?,Lutein-type dyes?yellow chrysanthe-mum,yellow silk chrysanthemum?and Chl-CuNa with excellent photoelectric properties respectively were selected as dye sensitizers,and hybridly sensitizing photoanode was studied,keeping each group with two types of solution and two types of solution with equal volume;selecting Chl-CuNa as one layered dye solution,anthocyanidins dyes and lutein-type dyes with excellent optoelectronic properties as another layered dye,according to the order and reverse order to layeredly sensitize the photoanode.The results showed that when mixing sensitized DSSC,the optimal combination of dyes was blue and blueberry,the efficiency was 1.11%.When DSSC is sensitized layeredly,the optimal sequential dye combination was Chl-CuNa-yellow silk chrysanthemum,the efficiency of1.00%,the best reverse order layered dye combination is yellow silk chrysanthemum-Chl-CuNa,with an efficiency of 0.85%.The research contents of this paper have some guiding significances for the optimizaton,popularization and application of natural dye-sensitized solar cells.