Wet-processed n-type OTFTs utilizing highly-stable colloids of a perylene diimide derivative

Abstract Here we propose and demonstrate a new approach to wet-processed organic thin-film transistors utilizing highly-stable colloids of small molecular organic semiconductors prepared by laser ablation technique. Highly stable N,N′-ditridecyl-3,4,9,10-perylenetetracarboxylic diimide (PTCDI-C13) colloids of 0.1 wt% concentration were prepared successfully by laser ablation technique in acetonitrile. Mean particle size of the prepared PTCDI-C13 colloid measured by dynamic light scattering method was smaller than 50 nm which is also confirmed by a transmission electron microscope observation. By simple drop-casting of prepared PTCDI-C13 colloids, typical n-type OTFTs with good saturation properties were fabricated successfully. The highest electron mobility was 1.1 × 10 −3  cm 2 /Vs and increased up to 0.027 cm 2 /Vs by post-annealing treatment.