Effects of substituents on the intermolecular interaction, morphology, and charge transport of novel bis-lactam-based molecules

Title
Effects of substituents on the intermolecular interaction, morphology, and charge transport of novel bis-lactam-based molecules
Authors
권지언김수연김진홍최민우박수영
Keywords
organic transistor; NTD
Issue Date
2021-10
Publisher
Journal of materials chemistry. C, Materials for optical and electronic devices
Citation
VOL 9-14462
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/74128
ISSN
2050-7526
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KIST Publication > Article
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