Photovoltaic properties of poly(benzothiadiazole-thiophene-co-bithiophene) as donor in polymer solar cells

作者: Guangjin Zhao , Youjun He , Chang He , Haijun Fan , Yun Zhao

DOI: 10.1016/J.SOLMAT.2010.10.007

关键词: ThiopheneChemical engineeringSide chainPolymer solar cellPolymer chemistryMaterials scienceElectron donorElectron acceptorMonomerOrganic solar cellAcceptor

摘要: Abstract We report the photovoltaic properties of a D–A copolymer, poly(benzothiadiazole-thiophene-co-bithiophene) (PBTTbT), containing donor (D) unit oligothiophene with hexyl side chain and acceptor (A) 2,1,3-benzothiadiazole (BT) methyl chain. The geometry, electronic absorption spectroscopic bithiophene-benzothiadiazole-thiophene monomer (M1) polymer were investigated theoretically by density functional theory (DFT) method for deep understanding relationship structure polymer. Polymer solar cells (PSCs) fabricated PBTTbT as an electron blended [6,6]-phenyl-C71-butyric acid ester (PC 70 BM) acceptor. power conversion efficiency (PCE) PSC is 0.87% optimized PBTTbT:PC BM weight ratio 1:3, under illumination AM 1.5, 100 mW/cm 2 . With additive 1% 1,8-dioctanedithiol thermal annealing at 130 °C 15 min, PCE device was improved to 1.98%. improvement ascribed better morphology active layer annealing.

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