Effect of mixture ratio on the performance of MDMO-PPV:PCBM bulk heterojunction solar cells: A numerical study

This paper presents a systematic numerical simulation of variation of blending ratio and cathode work function dependence of poly(2-methoxy-5-(3′,7′-dimethyloctyloxy)-para-phenylene vinylene) (MDMO-PPV):phenyl-C61-butyric acid methyl ester (PCBM) bulk heterojunction (BHJ) solar cells performance for MDMO-PPV concentration between 0 and 100mol percentage and cathode work function interval 3.7–4.7eV. From our studies it became evident that the open-circuit voltage (Voc), short-circuit current (Jsc) and fill factor (FF) decrease with the increasing cathode work function. It is shown that Jsc increases almost linearly with the increasing MDMO-PPV concentration from 0 to 60mol%, and then decreases. With the increasing of MDMO-PPV concentration, FF augments gradually to 76.56% and then plunges to 19.53%. It is also demonstrated that when MDMO-PPV is larger than 45mol%, the enhancing MDMO-PPV mol percentage is detrimental for the device performance.