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Molecular weight dependent vertical composition profiles of PCDTBT:PC??BM blends for organic photovoltaics.

ABSTRACT: We have used Soxhlet solvent purification to fractionate a broad molecular weight distribution of the polycarbazole polymer PCDTBT into three lower polydispersity molecular weight fractions. Organic photovoltaic devices were made using a blend of the fullerene acceptor PC??BM with the molecular weight fractions. An average power conversion efficiency of 5.89% (peak efficiency of 6.15%) was measured for PCDTBT blend devices with a number average molecular weight of Mn = 25.5 kDa. There was significant variation between the molecular weight fractions with low (Mn = 15.0 kDa) and high (Mn = 34.9 kDa) fractions producing devices with average efficiencies of 5.02% and 3.70% respectively. Neutron reflectivity measurements on these polymer:PC??BM blend layers showed that larger molecular weights leads to an increase in the polymer enrichment layer thickness at the anode interface, this improves efficiency up to a limiting point where the polymer solubility causes a reduction of the PCDTBT concentration in the active layer.

SUBMITTER: Kingsley JW 

PROVIDER: S-EPMC4055896 | biostudies-other | 2014

REPOSITORIES: biostudies-other

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Molecular weight dependent vertical composition profiles of PCDTBT:PC₇₁BM blends for organic photovoltaics.

Kingsley James W JW   Marchisio Pier Paolo PP   Yi Hunan H   Iraqi Ahmed A   Kinane Christy J CJ   Langridge Sean S   Thompson Richard L RL   Cadby Ashley J AJ   Pearson Andrew J AJ   Lidzey David G DG   Jones Richard A L RA   Parnell Andrew J AJ  

Scientific reports 20140613

We have used Soxhlet solvent purification to fractionate a broad molecular weight distribution of the polycarbazole polymer PCDTBT into three lower polydispersity molecular weight fractions. Organic photovoltaic devices were made using a blend of the fullerene acceptor PC₇₁BM with the molecular weight fractions. An average power conversion efficiency of 5.89% (peak efficiency of 6.15%) was measured for PCDTBT blend devices with a number average molecular weight of Mn = 25.5 kDa. There was signif  ...[more]

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