TY - JOUR
T1 - Thieno[3,2-b]thiophene flanked isoindigo polymers for high performance ambipolar OFET applications
AU - Meager, Iain
AU - Nikolka, Mark
AU - Schroeder, Bob C.
AU - Nielsen, Christian B.
AU - Planells, Miquel
AU - Bronstein, Hugo
AU - Rumer, Joseph W.
AU - James, David Ian
AU - Ashraf, Raja Shahid
AU - Sadhanala, Aditya
AU - Hayoz, Pascal
AU - Flores, Jean Charles
AU - Sirringhaus, Henning
AU - McCulloch, Iain
N1 - Publisher Copyright:
© 2014 Wiley-VCH Verlag GmbH & Co. KGaA.
PY - 2014/12/3
Y1 - 2014/12/3
N2 - The synthesis of a new thieno[3,2-b]thiophene isoindigo (iITT) based monomer unit, and its subsequent incorporation into a series of alternating copolymers is reported. Copolymerisation with benzothiadiazole, bithiophene and thiophene comonomer units by palladium catalysed cross coupling gives three new narrow band gap semiconducting polymers for OFET applications. Extending the fused nature of the isoindigo core serves to further enhance molecular orbital overlap along the polymer backbones and facilitate good charge transport characteristics thus demonstrating the potential of extending the fused ring system that is attached to the isoindigo core. When used as the semiconducting channel in top-gate/bottom-contact OFET devices, good ambipolar properties are observed, with hole and electron mobilities up to 0.4 cm2/Vs and 0.7 cm2/Vs respectively. The three new polymers show good stability, with high temperature annealing showing an increase in the crystallinity of the polymers which corresponds directly to charge carrier mobility improvement as shown by X-ray diffraction, atomic force microscopy and photothermal deflection spectroscopy.
AB - The synthesis of a new thieno[3,2-b]thiophene isoindigo (iITT) based monomer unit, and its subsequent incorporation into a series of alternating copolymers is reported. Copolymerisation with benzothiadiazole, bithiophene and thiophene comonomer units by palladium catalysed cross coupling gives three new narrow band gap semiconducting polymers for OFET applications. Extending the fused nature of the isoindigo core serves to further enhance molecular orbital overlap along the polymer backbones and facilitate good charge transport characteristics thus demonstrating the potential of extending the fused ring system that is attached to the isoindigo core. When used as the semiconducting channel in top-gate/bottom-contact OFET devices, good ambipolar properties are observed, with hole and electron mobilities up to 0.4 cm2/Vs and 0.7 cm2/Vs respectively. The three new polymers show good stability, with high temperature annealing showing an increase in the crystallinity of the polymers which corresponds directly to charge carrier mobility improvement as shown by X-ray diffraction, atomic force microscopy and photothermal deflection spectroscopy.
KW - Conjugated polymers
KW - Isoindigo
KW - OFET
KW - Thieno [3,2-b]thiophene
UR - http://www.scopus.com/inward/record.url?scp=84919352930&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84919352930&partnerID=8YFLogxK
U2 - 10.1002/adfm.201402307
DO - 10.1002/adfm.201402307
M3 - Article
AN - SCOPUS:84919352930
SN - 1616-301X
VL - 24
SP - 7109
EP - 7115
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 45
ER -