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Controlling Molecular Weight of a High Efficiency Donor‐Acceptor Conjugated Polymer and Understanding Its Significant Impact on Photovoltaic Properties
Author(s) -
Li Wentao,
Yang Liqiang,
Tumbleston John R.,
Yan Liang,
Ade Harald,
You Wei
Publication year - 2014
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201305251
Subject(s) - materials science , monomer , conjugated system , polymer , photovoltaic system , stoichiometry , polymer solar cell , acceptor , chemical engineering , chemistry , composite material , ecology , biology , physics , engineering , condensed matter physics
The molecular weight (MW) of PBnDT‐FTAZ can be precisely controlled by adjusting the stoichiometric ratio of the two monomers, following the Carothers equation. The study of a set of PBnDT‐FTAZ polymers with different MWs reveals that the MW significantly influences the morphology and structural order of PBnDTFTAZ in its bulk heterojunction solar cells, with the highest efficiency (over 7%) achieved with the use of a MW of 40 000 g mol −1 .