Abstract: The highly efficient solar cells based on the blend of MEH-PPV{poly[2-methoxy-5-(2'-ethylhexoxy)]-1,4-phenylene vinylene} as a donor and PCBM[1-(3-methoxycarbonyl)-propyl-1-1-phenyl-(6,6)C₆₁] as an acceptor were fabricated. We obtained an open circuit voltage of 0.8 V, short circuit current density of 5.06 mA/cm² and fill factor of 48.1% under 100 mA/cm² air-mass 1.5 solar simulator illumination, yielding a 1.93% power conversion efficiency. There was not chemistry reaction between MEH-PPV and PCBM from their UV-Vis chart. The intense PL of MEH-PPV was, however, almost completely quenched, implying the excitons are effectively separated on the interface of donor and acceptor and transported in bicontinuous path. We alse analyzed physical meaning of the I-V curve chart under illumination and dark condition, discussed the charge transport between MEH-PPV and PCBM, and studied the diversification of solar cells performance at different light intensity. With the increase of incident light intensity, the short circuit current density of the solar cells enhanced, open circuit voltage increased slowly, the parallel resistance and the fill factor descended, series resistance did not change distinctly.

Key words: Solar cell, Polymer, Electronic donor material, Electronic acceptor material