Study On Design,Fabrication And Photovoltaic Performance Of High Efficiency Organic Solar Cells

Organic solar cells(OSCs)has many advantages,such as wide material source,lightweight,simple preparation,large preparation area and so on.It is a photovoltaic technology which has great appropriate potential.In order to make OSCs practically come true,the recent research focus is its CPE further improvment.OSCs consists of electrode material,active sleeve material and boundary layer material.Regulation for active sleeve material and boundary layer material plays an important role in OSCs power conversion efficiency(CPE)elevation.Suited active sleeve material can broaden the range of light absorption,and increase the efficiency of exciton separation.Suited boundary layer material can effectively restrain exciton recombination,and decrease the contact resistance of active sleeve/electrode boundary.1.Traditional active sleeve binary blends by one electron donor and one electron acceptor.In order to overcome the weaknesses of binary blend active sleeve,especially the limit on the light absorption range.In this study,we developed a ternary blend active sleeve.On the base of PTB7:PC71BM binary blend system,we added a home-made micromolecule third ingredient to broad active sleeve light absorption range,and we implemented substantial improvement in organic solar CPE.In this essay,we compounded a series of micromolecule third ingredients.In those ingredients,the micromolecule FTR had the widest light absorption range.After mixing 15% w/w FTR into PTB7:PC71BM binary blend system,CPE increased from 7.0% to 8.3%.We found that,after mixing FTR into PTB7:PC71BM binary blend system,there was an electron transfer between FTR and PTB7,which could significantly improve the short circuit current of the cell.The after FTR mixing,not only between PTB7 and PC71 BM,but also between PTB7 and FTR there were active sleeve's exciton molecules.This could conspicuously increase decollement of exciton,and improved the development of the filling factor.The improvement of the short circuit current and filling factor caused the conspicuous elevation of CPE.2.Boundary layer material includes transmission electronics boundary layer material and transmission hole-boundary layer material.Among them,the development of transmission hole-boundary layer material is lagging.At present,the commercialization product is only PEDOT:PSS.PEDOT:PSS has acidity and hydroscopicity which go against the long-term stabilization of wares.Specifically,isolated PSS and strong anisotropy PEDOT can limit the transmission and collection of charge,which go against the improvement of cell's CPE.For the weakness of PEDOT:PSS,in this essay,we developed a series of new pH neutral conjugated polyelectrolytes(CPEs)typical hole-transporting boundary layer materials.The result of CPE test showed that,our CPEs could speed the conformation of ohmic contact between active sleeve and electrode to increase the open circuit voltage of the cell;it had high and adqulis conductivity which could improve the efficiency of hole extraction and decreased exciton recombination to improve cell's short circuit current and filling factor;it had characteristic of pH neuter which could enhance the stability of wares.If you used our CPEs as a hole-transporting layer,the CPE of the OSCs would be conspicuously improved.