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Polymer solar cells hold the promise to be a low cost, mechanically robust renewable power source, possibly used in building integrated photovoltaics. During the past decades, considerable progress has been made in improving the performance of polymer solar cells, with single-junction power conversion efficiencies (PCEs) of over 11%, through optimizing active layer absorption, energy level matching and morphology.[1, 2] However the acceptor molecules used in the bulk heterojunction (BHJ) of these solar cells are mostly limited to fullerene-based electron acceptors. There is a growing interest to replace fullerene acceptors with polymer acceptors to gain benefits including lower cost, broader light spectrum coverage