Chlorinated 2,1,3-Benzothiadiazole-Based Polymers
for Organic Field-Effect Transistors
Posted on 2017-06-16 - 20:13
The
vital role of introducing chlorine (Cl) atoms onto conjugated
polymers, which affects their semiconducting properties, is not yet
well understood. A series of donor–acceptor polymers based
on dichlorinated-2,1,3-benzothiadiazole (2ClBT) and four different
donor moieties with various conjugation lengths (thiophene (T), thieno[3,2-b]thiophene (TT), 2,2′-bithiophene (DT), and (E)-2-(2-(thiophen-2-yl)vinyl)thiophene (TVT)) were
synthesized and used in organic field-effect transistors (OFETs).
The structure–property relationship associated with the 2ClBT-based
polymers was thoroughly investigated via a range of techniques, and
it was found that a change in the conjugation length of the main backbone
could alter energy levels, morphology, and optoelectronic properties,
which had a significant effect on the charge transport property. P2ClBT-TVT
exhibited superior qualities relative to the other samples with respect
to the degree of uniform film-forming ability and molecular organization
and charge carrier transport, which resulted in the best hole mobility
of 0.147 cm2 V–1 s–1. Furthermore, we also emphasize that for all the polymers no substantial
changes were observed in the OFET transfer-curve slopes during 200
testing cycles, indicating excellent operational stability. This study
demonstrates that the design of semiconducting polymers possessing
Cl atoms was effective at improving operating stability in the OFETs
manufactured from them.
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Kang, So-Huei; Tabi, Grace Dansoa; Lee, Junghoon; Kim, Gyoungsik; Noh, Yong-Young; Yang, Changduk (2017). Chlorinated 2,1,3-Benzothiadiazole-Based Polymers
for Organic Field-Effect Transistors. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.7b00900
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AUTHORS (6)
SK
So-Huei Kang
GT
Grace Dansoa Tabi
JL
Junghoon Lee
GK
Gyoungsik Kim
YN
Yong-Young Noh
CY
Changduk Yang
KEYWORDS
2 ClBT-based polymersstabilityfield-effect transistorsconjugation lengthsconjugation lengthdonor moietiesoptoelectronic propertiesCl atomsOrganic Field-Effect Transistorsuniform film-forming abilitythiophenesemiconducting polymerscharge transport propertyhole mobilityP 2ClBT200 testing cyclesDTTTsemiconducting propertiescharge carrier transportOFET transfer-curve slopesenergy levelsTVT