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Isoindigo‐3,4‐Difluorothiophene Polymer Acceptors Yield “All‐Polymer” Bulk‐Heterojunction Solar Cells with over 7 % Efficiency
Author(s) -
Liu Shengjian,
Firdaus Yuliar,
Thomas Simil,
Kan Zhipeng,
Cruciani Federico,
Lopatin Sergei,
Bredas JeanLuc,
Beaujuge Pierre M.
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201709509
Subject(s) - polymer solar cell , polymer , fullerene , materials science , acceptor , copolymer , chemical engineering , organic solar cell , yield (engineering) , polymer chemistry , chemistry , organic chemistry , composite material , physics , engineering , condensed matter physics
Poly(isoindigo‐ alt ‐3,4‐difluorothiophene) (PIID[2F]T) analogues used as “polymer acceptors” in bulk‐heterojunction (BHJ) solar cells achieve >7 % efficiency when used in conjunction with the polymer donor PBFTAZ (model system; copolymer of benzo[1,2‐ b :4,5‐ b′ ]dithiophene and 5,6‐difluorobenzotriazole). Considering that most efficient polymer‐acceptor alternatives to fullerenes (e.g. PC 61 BM or its C 71 derivative) are based on perylenediimide or naphthalenediimide motifs thus far, branched alkyl‐substituted PIID[2F]T polymers are particularly promising non‐fullerene candidates for “all‐polymer” BHJ solar cells.