Different Conditions On The Polymer Solar Cells Performance

Polymer solar cells due to it’s low manufacturing cost, flexibility, could be large areamanufactured and produced with low pollution,have been extensively researched with a greatfavor, now have been advocated to be alternatives as inorganic cells.This article introducesthe theory of polymer solar cells, commonly used materials, as well as productionmethod,reserching different conditions on the cell performance so as to achieve a better cellperformance parameters, mainly the following aspects of the work:Firstly, the conditions on the substrate and the active layer of the polymer cell.First,produce a PET substrate and a glass substrate of different types of cells, PET substrate/ITO/PEDOT:PSS/P3HT:PCBM/LiF/Al and glass substrate/ITO/PEDOT:PSS/P3HT:PCBM/LiF/Al two different strucure cells, through the I-V curve measurement we get informationthat the cell performance parameters of the glass substrate is superior to the flexible PETsubstrate cells. Then produced five cells, respectively, analyze two aspects of the active layerwhich is thickness and annealing conditions. Considering only the active layer thickness, theactive layer thickness of100nm hold the best performance,whose energy conversionefficiency is2.03%; again anlaze between the annealing and the after annealing, we foundthat after annealing achieve the best conversion efficiency which is2.25%.Secondly, base on the previous reserch, change the single solvent of the active layer totwo mixed solvents. Among this experiment,produce six cells, of which active layer isdifferent ratio of chloroform and chlorobenzene, device structure is ITO/PEDOT:PSS/P3HT:PCBM/LiF/Al,through the measurement we get I-V curve datas and AFM images. After datasand AFM images measurement,we find when the active layer solvent’ratio of chlorobenzeneand chloroform achieve1:4, the performance of the cell achieve the best power conversionefficiency of2.73%.Thirdly, study a new type material PCDTBT, researching hole transport layer PEDOT tosolar cells’ active layer with PCDTBT and PC70BM, Also research the effect of electrontransport layer LiF on solar cell performance. First, produce four different PEDOT thickness cells, discover that during PEDOT thickness with80nm,cell efficiency reach thebest,achieving5.38%, when add a LiF layer between the active layer with the aluminumelectrode layer,cell efficiency also increase, the efficiency reach5.61%.