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Bulk heterojunction organic solar cells(OSCs) based on the blend of poly(2-methoxy-5(2’-ethyl-hexyloxy)-1,4-phenylenevinylene(MEH-PPV) and [6,6]-phenyl C61 butyric acid methyl ester(PCBM) with different weight ratios(from 1:3 to 1:5) have been fabricated