TY - JOUR
T1 - Unraveling the Unconventional Order of a High-Mobility Indacenodithiophene-Benzothiadiazole Copolymer
AU - Cendra, Camila
AU - Balhorn, Luke
AU - Zhang, Weimin
AU - O'Hara, Kathryn
AU - Bruening, Karsten
AU - Tassone, Christopher J.
AU - Steinrück, Hans Georg
AU - Liang, Mengning
AU - Toney, Michael F.
AU - McCulloch, Iain
AU - Chabinyc, Michael L.
AU - Salleo, Alberto
AU - Takacs, Christopher J.
N1 - Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/10/19
Y1 - 2021/10/19
N2 - A new class of donor-acceptor (D-A) copolymers found to produce high charge carrier mobilities competitive with amorphous silicon (>1 cm2 V-1 s-1) exhibit the puzzling microstructure of substantial local order, however lacking long-range order and crystallinity previously deemed necessary for achieving high mobility. Here, we demonstrate the application of low-dose transmission electron microscopy to image and quantify the nanoscale and mesoscale organization of an archetypal D-A copolymer across areas comparable to electronic devices (≈9 μm2). The local structure is spatially resolved by mapping the backbone (001) spacing reflection, revealing nanocrystallites of aligned polymer chains throughout nearly the entire film. Analysis of the nanoscale structure of its ordered domains suggests significant short- and medium-range order and preferential grain boundary orientations. Moreover, we provide insights into the rich, interconnected mesoscale organization of this new family of D-A copolymers by analysis of the local orientational spatial autocorrelations.
AB - A new class of donor-acceptor (D-A) copolymers found to produce high charge carrier mobilities competitive with amorphous silicon (>1 cm2 V-1 s-1) exhibit the puzzling microstructure of substantial local order, however lacking long-range order and crystallinity previously deemed necessary for achieving high mobility. Here, we demonstrate the application of low-dose transmission electron microscopy to image and quantify the nanoscale and mesoscale organization of an archetypal D-A copolymer across areas comparable to electronic devices (≈9 μm2). The local structure is spatially resolved by mapping the backbone (001) spacing reflection, revealing nanocrystallites of aligned polymer chains throughout nearly the entire film. Analysis of the nanoscale structure of its ordered domains suggests significant short- and medium-range order and preferential grain boundary orientations. Moreover, we provide insights into the rich, interconnected mesoscale organization of this new family of D-A copolymers by analysis of the local orientational spatial autocorrelations.
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U2 - 10.1021/acsmacrolett.1c00547
DO - 10.1021/acsmacrolett.1c00547
M3 - Article
C2 - 35549036
AN - SCOPUS:85117857074
SN - 2161-1653
VL - 10
SP - 1306
EP - 1314
JO - ACS Macro Letters
JF - ACS Macro Letters
IS - 10
ER -