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Yaqi Tang and Christopher R. McNeill All-polymer solar cells utilizing low band gap polymers as donor and acceptor Journal of Polymer Science Part B: Polymer Physics 51

Version of Record online: 18 DEC 2012 | DOI: 10.1002/polb.23233

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The two low band gap polymers poly{[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′']dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]} (PTB7) and poly{[N,N-9-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,59-(2,29-bithiophene)} (P(NDI2OD-T2)) are successfully paired as donor and acceptor in polymer/polymer blend solar cells. A power conversion efficiency of 1.1% is achieved with a peak external quantum efficiency of 18% at 680 nm. Structural characterization of PTB7/P(NDI2OD-T2) blends reveals a favorable microstructure with 9.5-nm thick P(NDI2OD-T2) crystals embedded in an amorphous PTB7 matrix with a lack of larger, mesoscale phase separation.

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