Effects of substituents on the intermolecular interaction, morphology, and charge transport of novel bis-lactam-based molecules
- Effects of substituents on the intermolecular interaction, morphology, and charge transport of novel bis-lactam-based molecules
- 권지언; 김수연; 김진홍; 최민우; 박수영
- organic transistor; NTD
- Issue Date
- Journal of materials chemistry. C, Materials for optical and electronic devices
- VOL 9-14462
- To elucidate the origin of high charge carrier mobility in bis-lactam compounds with twisted
geometries, we designed and synthesized a series of 3,7-diphenyl-1,5-dioctyl-1,5-naphthyridine-2,6-
dione (NTDP) derivatives bearing various substituents (i.e., OCH3, CH3, H, F, and Cl) in the end-capping
phenyl rings. Despite the distinct dihedral angle between the 1,5-naphthyridine-2,6-dione (NTD) core
and the end-capping groups, all of the derivatives formed rigid molecular structures and the delocalized
highest occupied molecular orbitals (HOMOs), which could lead to high charge transport properties.
Among the derivatives, the fluorinated NTDP molecule (NTDP-F) exhibited the highest hole mobility of
0.54 cm2 V1 s
1 in vacuum-deposited organic field-effect transistors (OFETs) due to the strong
intermolecular interaction, high crystallinity, and two-dimensional (2D) terrace-like morphology in the
thin-film. Furthermore, the twisted geometry of NTDP-F allowed facile solution processability resulting
in a high hole mobility of up to 0.27 cm2 V1 s
1 in solution-processed OFETs.
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