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Naphtho[1,2-c:5,6-c]bis(1,2,5-thiadiazole) (NT) was a very promising building block as a strong acceptor for the D-A structure polymers.1 Compared with 2,1,3-benzothiadiazole (BT),NT has an enlarged planar aromatic structure containing two fused BT rings,which facilitates stronger interchain packing of the resulting polymers and enhances the carrier mobility,and consequently leads to a high power conversion efficiencies (PCE).