TY - JOUR
T1 - High performance p-type chlorinated-benzothiadiazole-based polymer electrolyte gated organic field-effect transistors
AU - Tabi, Grace Dansoa
AU - Nketia-Yawson, Benjamin
AU - Kang, So Huei
AU - Yang, Changduk
AU - Noh, Yong Young
N1 - Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/3
Y1 - 2018/3
N2 - We report the evaluation of charge transport parameters of four p-type dichlorinated-2,1,3-benzothiadiazole (2ClBT) based conjugated polymers end-capped with different electron-donor units (thiophene (T), thieno[3,2-b]thiophene (TT), 2,2′-bithiophene (DT), and (E)-2-(2-(thiophen-2-yl)vinyl)thiophene (TVT)) in electrolyte gated organic field-effect transistors operating at a driving voltage of −2 V. Remarkable hole mobility improvement of 0.13–0.56 cm2V−1s−1 were achieved in 2ClBTs based polymers, with P2ClBT-DT recording the highest mobility of 0.56 cm2V−1s−1 and current on/off ratio ∼107. Interestingly, a positive threshold voltage shift (ΔVTh) was observed in the transfer characteristics from the linear to saturation regime of all the 2ClBTs based polymer electrolyte gated OFET devices of L = 10 μm, contrary to devices with conventional poly(methyl methacrylate) gate dielectric, which showed a negative ΔVTh shift. Among the 2ClBTs based polymers, P2ClBT-TVT devices showed the lowest mobility and ΔVTh shift, which is attributed to severe ion diffusion in the polymer semiconducting layer owing to the vinyl group backbone susceptible to electrochemical doping. Our results emphasize essential selection consideration of the monomeric moieties, molecular ordering, π-π stacking and backbone planarity of conjugated polymers for electrolyte based organic devices.
AB - We report the evaluation of charge transport parameters of four p-type dichlorinated-2,1,3-benzothiadiazole (2ClBT) based conjugated polymers end-capped with different electron-donor units (thiophene (T), thieno[3,2-b]thiophene (TT), 2,2′-bithiophene (DT), and (E)-2-(2-(thiophen-2-yl)vinyl)thiophene (TVT)) in electrolyte gated organic field-effect transistors operating at a driving voltage of −2 V. Remarkable hole mobility improvement of 0.13–0.56 cm2V−1s−1 were achieved in 2ClBTs based polymers, with P2ClBT-DT recording the highest mobility of 0.56 cm2V−1s−1 and current on/off ratio ∼107. Interestingly, a positive threshold voltage shift (ΔVTh) was observed in the transfer characteristics from the linear to saturation regime of all the 2ClBTs based polymer electrolyte gated OFET devices of L = 10 μm, contrary to devices with conventional poly(methyl methacrylate) gate dielectric, which showed a negative ΔVTh shift. Among the 2ClBTs based polymers, P2ClBT-TVT devices showed the lowest mobility and ΔVTh shift, which is attributed to severe ion diffusion in the polymer semiconducting layer owing to the vinyl group backbone susceptible to electrochemical doping. Our results emphasize essential selection consideration of the monomeric moieties, molecular ordering, π-π stacking and backbone planarity of conjugated polymers for electrolyte based organic devices.
KW - Benzothiadiazole
KW - Conjugated polymers
KW - Organic field-effect transistors
KW - Solid-state electrolyte
KW - Threshold voltage shift
UR - http://www.scopus.com/inward/record.url?scp=85044440105&partnerID=8YFLogxK
U2 - 10.1016/j.orgel.2018.01.003
DO - 10.1016/j.orgel.2018.01.003
M3 - Article
AN - SCOPUS:85044440105
SN - 1566-1199
VL - 54
SP - 255
EP - 260
JO - Organic Electronics
JF - Organic Electronics
ER -