The Study On Interface Properties Between Transparent Conductive Film And Active Layer On The Performance Of PSCs

Solar energy is a real sense of green energy because it distributed on earth widely andinexhaustible. Compared with conventional solar cells, polymer solar cells with a low cost, lightweight, which was easily manufactured for large area. It also can be made flexible and forspecial shape components. Due to these advantanges, the polymer solar cells becomes one of themost popular researches areas in rencent years.In this paper, we study the interface properties between transparent conductive films andactive layer on performance of polymer solar cells.Based on the polymer system of ITO/PEDOT:PSS/P3HT:PCBM/LiF/Al, we doped withpolar organic solvent of dimethyl sulfoxide (DMSO) and high boiling point organic slovent ofethylene glycol into PEDOT:PSS. We found that the conductivity of PEDOT:PSS films wassignificantly improved. When the doping concentration of DMSO and ethylene glycol bothreached to 10wt%, the film's conductivity was improved 2 and 3 orders of magnitude comparedwith the undoped films respectively. Both of them were appiled in polymer solar cells, the diviceof doped DMSO improved the short-circuit current density from 8.04 mA/cm2 to 11.05 mA/cm2,with the efficiency of 4.45%.With the system of different transparent conductive film (TCO), we studied the interfaceproperties between TCO and active layer on performance of polymer solar cells. It was foundthat the TCO with a variety of morphologies, high transmittance, smooth surface, and a goodohmic contact conditions with the active layer can improve the performance of device. Weacquired the divice properties based on the FTO substrate, Which was the Voc of 0.62 V, Jsc of9.02 mA/cm², FF of 63%, yeilying the effiency of 3.51%. In order to form the vacuum dipole layer, we added the meltal oxides WO3 between the electrode and active layer. This increased thebuilt-in electric field of the divice and improved the performance accordingly of polymer solarcells.Then we study the interface properties between transparent conductive films as cathode andactive layer on performance of the trans configuration polymer solar cells. Based on the ITO andFTO as the substrate, we studied the variation of the performance with different inter-layerbetween the active layer and cathode. The study found that both TiO₂ and ZnO can effectivelyprevent the hole into the cathode while the electronic was propitious to the cathode. With thesystem of FTO/TiO₂/P3HT:PCBM/Ag and ITO/ZnO/P3HT:PCBM/Ag, the modification and theelectrode layer can be matched reasonably.