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Building Block for Organic Photovoltaic Cell Polymers
No.149(December 2012)

2,1,3-Benzothiadiazole is a well-known electron-deficient molecule, which can be conjugated with an electron-rich molecule to form co-polymers with small energy band gaps. Recently, several different co-polymers bearing the benzothiadiazole moiety have been synthesized for organic photovoltaic devices. For instance, Kim et al. have reported the synthesis of the co-polymer, which is generated from an electron-rich phenanthrene moiety and an electron-deficient 2,1,3-benzothiadiazole moiety, using 1 as a starting material. According to their results, the bulk heterojunction solar cell composed of this co-polymer and PC71BM gives a power conversion efficiency of 1.12%.

References
- Low-bandgap poly(4H-cyclopenta[def]phenanthrene) derivatives with 4,7-dithienyl-2,1,3-benzothiadiazole unit for photovoltaic cells
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