The powder sample was synthesized by a one-step method. 35DCzPPy (210 mg) and CuI (30 mg) were put into 10 mL chlorobenzene and stirred for 24 h at 80 °C to form a yellow-green suspension, then centrifuged at 9000 r.p.m. for 3 min to collect the precipitate. It was further washed three times by chlorobenzene and then dried at 50 °C in a N2-filled glove box.
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