Pyromellitic Diimides: Minimal Cores For High Mobility N-channel Transistorrnsemiconductors

摘要

The past decade has witnessed an increasing interest in organic thin film transistors (OTFTs) due to their applications in light-emitting displays, radio frequency identification tags, and sensors. Organic semiconductors can function either as a p-channel or n-channel charge carrier. While many organic materials can be used for p-channel OTFTs, there is only a limited number of organic materials that can be used for n-channel OTFTs. Therefore, there is a need to explore more n-channel materials with high mobility and stability, to allow for combining n-channel and p-channel transistors in complementary circuits that have the advantages of low power dissipation, low noise, and greater operational stability. Since the report of naphthalenetetracarboxylic diimides as air stable n-channel materials with mobility up to 0.1 cm~2/(V.s), a large number of n-channel materials have been based on either naphthalene or perylene tetracarboxylic diimides. Recently, several anthracene tetracarboxylic diimides were synthesized by Marks et al. through multistep reactions and found to be good n-channel materials with high on-off ratios. The common structural features, the tetracarboxylic diimides, were flanked on both sides of the planar aromatic rings, which were varied from two-ring naphthalene to three-ring anthracene, and finally to five-ring perylene.