Low-temperature-processible, transparent, and air-operable n-channel fluorinated phenylethylated naphthalenetetracarboxylic diimìde semiconductors applied to flexible transistors

Byung Jun Jung, Jia Sun, Taegweon Lee, Amy Sarjeant, Howard E. Katz

Research output: Contribution to journalArticlepeer-review

84 Scopus citations

Abstract

New N,N'-disubstituted-l,4,5,8-naphthalene tetracarboxylic acid diimides (NTCDI) with fluorinated phenylethyl groups were synthesized. In particular, N,N'-bis(2-(pentafluorophenyl)ethyl)-1,4,5,8-naphthalene tetracarboxylic acid diimide (5FPE-NTCDI) showed high electron mobility, more than 0.1 cm 2/(V s) in air, even though the film was deposited at room temperature. The correlation of the crystallinity, morphology, and mobility with the substrate temperature during deposition (T sub) was studied using X-ray diffraction (XRD) and atomic force microscopy (AFM). The films of 5FPE-NTCDI exhibited a "thin film phase", mixed phase, and crystal bulk phase as T sub was increased. The mixed phase on an octadecyltrimethoxysilane (OTS)-treated substrate also has high electron mobility due to well connected long fiber-shaped grains. The high mobility at low T sub has enabled fabrication of flexible transistors on the clear plastic substrate poly(ethylene terephthalate) (PET). The highest mobility for a flexible, transparent transistor was 0.23 cm 2/(V s), obtained with low hysteresis.

Original languageEnglish
Pages (from-to)94-101
Number of pages8
JournalChemistry of Materials
Volume21
Issue number1
DOIs
StatePublished - 13 Jan 2009

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