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′]dithiophene-Based Donor–Acceptor Polymers with New Polymerization and 2D Conjugation Extension Pathways: A Potential Donor Building Block for High Performance and Stable Inverted Organic Solar CellsChakravarthi, Nallan; Gunasekar, Kumarasamy; Kim, Chang Su; Kim, Dong-Ho; Song, Myungkwan; Park, Young Geun; Lee, Jin Yong; Shin, Yurim; Kang, In-Nam; Jin, Sung-Ho · Macromolecules · 2015