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In this paper,a simple and non-poisonous "surfactant treatment" method to prepare graphene oxide(GO)in organic solvents with good dispersibility was presented.As the surfactant molecules,didodecyldimethyla-mmonium bromide(DDAB)was attached onto the GO sheets via ionic interactions by mild sonication,the obtained GO∶DDAB nanocomposites were then blended into copolymer Poly(3-hexylthiophene-2,5-diyl)(P3HT)∶[6,6]-Phenyl-C61-butyric acid methyl ester(PC61BM)as the active layer to fabricate bulk-heterojunction(BHJ)organic solar cells ITO/PEDOT∶PSS/P3HT∶PC61BM∶(GO∶DDAB)/Ca/Al.