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Molecular weight is an important factor determining the morphology and performance of all‐polymer solar cells. Through the application of direct arylation polycondention, a series of batches of a fluorinated naphthalene diimide‐based acceptor polymer are prepared with molecular weight varying from Mn = 20 to 167 kDa. Used in conjunction with a common low bandgap donor polymer, the effect of acceptor...
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