Solution‐Processable Septithiophene Monolayer Transistor

Fused H-shaped tetrathiafulvalene–oligothiophenes as charge transport materials for OFETs and OPVs

“…In our previous report, septithiophene-TTF 3 exhibited a complex series of redox processes dispersed across a wide potential range that was difficult to explain and interpret with a high degree of 40 confidence. This was in contrast to the corresponding half unit 18 that revealed a relatively discernible redox profile, with three sequential oxidation processes.…”

“…0.6mT line width without any hyperfine splitting, as would be expected if delocalisation over the thiophene units was to take place. [28][29][30][31] The EPR spectra of the radical cation of TTF consist of five lines, originating from coupling with four 40 equivalent protons. 32 However, here the TTF unit is bereft of hydrogen, which would explain the absence of hyperfine features.…”

“…Thus, it has been shown that the role of the polymer/oligomer is crucial in determining whether the fulvalene unit can either dominate the electroactivity of the molecule, or participate in a hybrid redox state. 20 The electrochemical studies showed that, due to the TTF system being fused to the conjugated 40 chain through only one of the 1,3-dithiole rings, the second ring was free to act independently, providing the signature oxidation of the second dithiole moiety.…”

“…The substrates were placed on a hot plate at120°C for 20 minutes. For a typical OFET device reported here, Si/SiO2 substrates with interdigitated Au source-drain of channel length (10 μm) and 40 width (1 cm) were used in this study. Current-voltage measurements were performed using a Keithley 4200 at room temperature in an inert glove box with water and oxygen levels lower than 0.1 ppm.…”

Fabrication and Operation of Monolayer Mott FET at Room Temperature

“…14,15 Among these methods, SAM formation is the most reliable and convenient way to fabricate uniform and densely packed monolayer. By forming a covalent chemical bond between the molecule and substrate, a monolayer can be formed without any vacuum/heating or tedious operation.…”