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D‐A Conjugated Polymers Based on Tetracyclic Acceptor Units: Synthesis and Application in Organic Solar Cells
Author(s) -
Chen Jianhua,
Liao Qiaogan,
Ye Gang,
He Dan,
Du Xiaoyan,
Zhu Weiguo,
Liao Jianhe,
Xiao Zuo,
Ding Liming
Publication year - 2013
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201300294
Subject(s) - conjugated system , thiophene , copolymer , monomer , polymer chemistry , polymer , chemistry , organic solar cell , energy conversion efficiency , polymer solar cell , condensation , acceptor , materials science , photochemistry , organic chemistry , physics , optoelectronics , thermodynamics , condensed matter physics
Two electron‐deficient tetracyclic monomers, 6,9‐dibromo‐7,8‐bis(octyloxy)‐11H‐indeno[2,1‐b] quinoxalin‐11‐one ( M1 ) and 1,3‐bis(5′‐bromo‐4′‐hexylthiophen‐2‐yl)‐9H‐indeno[1,2‐b]thieno[3,4‐e]pyrazin‐9‐one ( M2 ), are synthesized through condensation of ninhydrin with aromatic diamines in good yields. Copolymerization of M1 with thiophene (Th) and dithieno[3,2‐b:2′,3′‐d]silole (DTS), and M2 with DTS affords three new D–A conjugated copolymers, P1 – P3, respectively . The optical, electrochemical, and photovoltaic properties of P1–P3 are investigated. P3 exhibits a broad absorption (300–1100 nm) and a low bandgap of 1.24 eV. Solar cells based on P3 /[6,6]‐phenyl C71 butyric acid methyl ester (PC 71 BM) blends afford a power conversion efficiency of 1.93% and a very broad spectral response (300–1020 nm).