High‐Mobility Organic Transistors Based on Single‐Crystalline Microribbons of Triisopropylsilylethynyl Pentacene via Solution‐Phase Self‐Assembly

Solution-processed, high-performance n-channel organic microwire transistors

“…The diameter and the length of BPE-PTCDI wires could be tuned across a wide range by either the nonsolvent nucleation (seeded-growth) (18,19) or solvent-exchange method (rapid solution dispersion) (18,20,23,40) …”

“…S1] showed that the absorption bands attributed to individual molecules (at 533, 494, 462, and 433 nm) decreased gradually with cooling time, whereas a new band corresponding to the crystalline phase appeared at a longer wavelength (Ϸ665 nm). The self-assembled structures of BPE-PTCDI molecules can be assigned to the J-aggregates due to the red-shifted absorption band, similar to other perylene diimide derivatives (23,40).The diameter and the length of BPE-PTCDI wires could be tuned across a wide range by either the nonsolvent nucleation (seeded-growth) (18,19) or solvent-exchange method (rapid solution dispersion) (18,20,23,40) …”

“…These unique materials combine the high-performance of singlecrystalline structures with solution-processability by dispersion (17,18). Several p-channel (hole-transporting) organic wires prepared by solution-processing have exhibited Ͼ 0.1 cm 2 /Vs for singlewire transistors (19)(20)(21)(22), whereas only a few solution-synthesized n-channel organic wires have been reported, typically with low performance ( Ϸ10 Ϫ3 Ϫ 10 Ϫ2 cm 2 /Vs) (23,24).…”

“…These unique materials combine the high-performance of singlecrystalline structures with solution-processability by dispersion (17,18). Several p-channel (hole-transporting) organic wires prepared by solution-processing have exhibited Ͼ 0.1 cm 2 /Vs for singlewire transistors (19)(20)(21)(22), whereas only a few solution-synthesized n-channel organic wires have been reported, typically with low performance ( Ϸ10 Ϫ3 Ϫ 10 Ϫ2 cm 2 /Vs) (23,24).Despite the intrinsic high mobility of single-crystalline wires, precise wire placement and wire-to-wire performance variation, due to the difference in the contact quality at the wire/insulator and wire/electrode interfaces, substantially hinder successful device integration (10, 25). Therefore, the technology to achieve network films of organic MWs deposited from a dispersion with controlled alignment and density is acutely desired.…”

Design and fabrication of compositionally graded inorganic oxide thin films: Mechanical, optical and permeation characteristics

“…Examples are insulators in thin film transistors [4], optical spacers or electron/hole blocking/transporting layers in photovoltaic systems [5,6], encapsulating gas barriers for organic electronics [7,8] and dielectric material in plasmonic molecular sensors [9,10]. Recently, as many devices have been developed with light, thin and even flexible characteristics, the need for thin film types of functional inorganic oxides is rapidly increasing, and the mechanical stability of inorganic thin films is inevitably becoming important for applications, particularly in flexible electronics [11][12][13][14].…”