Abstract: The various structure solar cells based on the blend of MEH-PPV(poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene) )and PCBM(1-(3-methoxycarbonyl)-propyl-1-1-phenyl-(6,6)C61) )as acceptor were fabricated. A mechanism of the influence of device structure on device performance was analyzed in detail. The result showed an increase of open circuit voltage and improvement of electric charge transport owing to the inserting of PEDOT:PSS (4083)(poly(3,4-ethylene dioxythiophene:poly(styrene sulphonic acid)). We also raised the short-circuit electric current and fill factor of device adopting LiF/Al negative electricity structure, and obtained an open circuit voltage of 0.8 V, short circuit current density of 3.40 mA·cm^-2 and fill factor of 52.1% under 100 mA·cm^-2 air-mass 1.5 solar simulator illumination, yielding a 1.43%power conversion efficiency. The influence of different solvents on device performance was studieds. The results showed that 1,2-dichlorobenzene was advantageous to the formation of good body heterojunction, and the performance of the corresponding device was excellence. We also analyzed the mechanism of the solvent influence on the device performance by light and dark I-V curve, photosensitivity, AFM, and gave some reasonable explainations.

Key words: Solar cell, Polymer, Performance