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Two novel naphtho[1,2‐c:5,6‐c]bis(1,2,5‐thiadiazole) and alkoxylphenyl substituted benzodithiophene based copolymers were developed as the donor materials for polymer solar cells. The resulting copolymers exhibit broad absorption bands in the range of 500–800 nm in thin films and deep highest occupied molecular orbital energy levels of −5.39 eV and −5.36 eV, respectively. The best device performance...
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