Controlling Molecular Weight of a High Efficiency Donor-Acceptor Conjugated Polymer and Understanding Its Significant Impact on Photovoltaic Properties

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 ord...

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Published inAdvanced materials (Weinheim) Vol. 26; no. 26; pp. 4456 - 4462
Main Authors Li, Wentao, Yang, Liqiang, Tumbleston, John R., Yan, Liang, Ade, Harald, You, Wei
Format Journal Article
LanguageEnglish
Published Germany Blackwell Publishing Ltd 09.07.2014
Subjects
Adjustment
GIWAXS
Heterojunctions
Mathematical analysis
miscibility
mixed domains
Molecular weight
Monomers
Morphology
Photovoltaic cells
polymer solar cells
R-SoSX
soft X-ray scattering
Solar cells
mixed domains
GIWAXS
R-SoSX
miscibility
molecular weight
polymer solar cells
soft X-ray scattering
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Summary: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.
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content type line 23
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201305251