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Synthesis and Photovoltaic Characterization of Dithieno[3,2‐b:2′,3′‐d]thiophene‐Derived Narrow‐Bandgap Polymers
Author(s) -
Zhu Enwei,
Ni Bin,
Zhao Baofeng,
Hai Jiefeng,
Bian Linyi,
Wu Hongbin,
Tang Weihua
Publication year - 2014
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.201300669
Subject(s) - polymer , thiophene , band gap , materials science , polymer solar cell , condensation polymer , polymer chemistry , energy conversion efficiency , homo/lumo , suzuki reaction , absorption (acoustics) , chemical engineering , molecule , optoelectronics , organic chemistry , chemistry , aryl , composite material , alkyl , engineering
Three novel dithieno[3,2‐b:2′,3′‐d]thiophene‐based low‐bandgap polymers are synthesized by a Suzuki–Miyaura coupling reaction or by direct arylation polycondensation. The polymers present a high molecular weight (26–32 kDa) and narrow polydiversity (1.3–1.7). With a highest occupied molecular orbital (HOMO) energy level around −5.20 eV, these polymers exhibit a narrow bandgap of 1.75–1.87 eV. All the polymers display strong absorption in the range of 350–700 nm. Bulk‐heterojunction (BHJ) solar cells are further fabricated by blending the as‐prepared polymer with (6,6)‐phenyl‐C 61 ‐butyric acid methyl ester (PC 61 BM) at different weight ratios. The best devices contribute a power conversion efficiency (PCE) of 0.73% under AM 1.5 (100 mW cm −2 ).