TY - JOUR
T1 - Sequential Fluorination on Napthaleneamide-Based Conjugated Polymers and Their Impact on Charge Transport Properties
AU - Kranthiraja, Kakaraparthi
AU - Long, Dang Xuan
AU - Sree, Vijaya Gopalan
AU - Cho, Woosum
AU - Cho, Young Rae
AU - Zaheer, Abbas
AU - Lee, Jong Cheol
AU - Noh, Yong Young
AU - Jin, Sung Ho
N1 - Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/8/14
Y1 - 2018/8/14
N2 - Improving π-conjugated polymer electron transport and injection efficiency are important to realize high performance n-channel organic field-effect transistors (OFETs). This paper reports a series of naphthalene diimide (NDI-) based n-type π-conjugated polymers, NDI-T-1FP-T, NDI-T-2FP-T, and NDI-T-4FP-T, with varioulis amounts of fluorine atoms (1F, 2F, and 4F) in their backbones. We found notable differences in energy levels, ground and excited state dipole moments (Δμge), exciton lifetimes, dihedral angles, and charge transport properties by varying the fluorine content: Δμge and charge transport properties reduced with increasing fluorine content. Electron mobility of optimized top gate bottom contact OFETs using the n-type π-conjugated polymers were 0.35, 0.18, and 0.16 cm2 V-1 s-1, respectively. OFET performances were further improved further by low concentration polyethylenimine (PEI) doping, significantly improving field-effect mobility to (maximum) 0.51, 0.34, and 0.26 cm2 V-1 s-1, respectively. Doped NDI-T-4FP-T with 4F in particular showed unipolar n-channel behavior by depletion of the hole current.
AB - Improving π-conjugated polymer electron transport and injection efficiency are important to realize high performance n-channel organic field-effect transistors (OFETs). This paper reports a series of naphthalene diimide (NDI-) based n-type π-conjugated polymers, NDI-T-1FP-T, NDI-T-2FP-T, and NDI-T-4FP-T, with varioulis amounts of fluorine atoms (1F, 2F, and 4F) in their backbones. We found notable differences in energy levels, ground and excited state dipole moments (Δμge), exciton lifetimes, dihedral angles, and charge transport properties by varying the fluorine content: Δμge and charge transport properties reduced with increasing fluorine content. Electron mobility of optimized top gate bottom contact OFETs using the n-type π-conjugated polymers were 0.35, 0.18, and 0.16 cm2 V-1 s-1, respectively. OFET performances were further improved further by low concentration polyethylenimine (PEI) doping, significantly improving field-effect mobility to (maximum) 0.51, 0.34, and 0.26 cm2 V-1 s-1, respectively. Doped NDI-T-4FP-T with 4F in particular showed unipolar n-channel behavior by depletion of the hole current.
UR - http://www.scopus.com/inward/record.url?scp=85051418832&partnerID=8YFLogxK
U2 - 10.1021/acs.macromol.8b00748
DO - 10.1021/acs.macromol.8b00748
M3 - Article
AN - SCOPUS:85051418832
SN - 0024-9297
VL - 51
SP - 5530
EP - 5536
JO - Macromolecules
JF - Macromolecules
IS - 15
ER -