Solution-Processed Naphthalene Diimide Derivatives as n-Type Semiconductor Materials

Abstract

Two soluble 1,4,5,8-naphthalenetetracarboxylic diimide (NTCDI) derivatives with phenylmethyl and (trifluoro-methyl)benzyl groups (NTCDI-P and NTCDI-F, respectively) were synthesized and used as semiconductor layers in organic thin-film transistors (OTFTs) by a spin-coating process in air. These two synthesized materials were characterized by 1 H NMR and UV−vis spectra as well as mass analysis. The morphology and crystallinity of spin-coated NTCDI-P and NTCDI-F films have been inspected using atomic force microscopy (AFM) and X-ray diffraction (XRD), respectively. The channel mobilities of these two NTCDI derivatives were calculated to be about 1.2 × 10 -3 cm 2 V -1 s -1 in air, which degraded slightly while stabilized for NTCDI-F OTFTs after exposure in air for 1 month.