High-mobility tetrathiafulvalene organic field-effect transistors from solution processing

Single Crystal‐Like Performance in Solution‐Coated Thin‐Film Organic Field‐Effect Transistors

“…[39] to the linear-regime-transfer characteristics of our OFETs. The charge to what has been reported for DB-TTF single crystals, [19] this yields two datasets corresponding to a low temperature (T < 200 K) and high temperature (T > 200 K) regime.…”

“…Furthermore, it has been shown to be a promising organic semiconductor due to its electronic and supramolecular structure. Hole mobility in the range 0.1-1 cm 2 /Vs has been reported for solution-processed single crystals of DB-TTF, [18,19] whereas devices comprising vacuum-deposited DB-TTF thin films show field-effect mobility that ranges from 10 -2 to 10 -1 cm 2 /Vs ( Figure S1). [20][21][22][23] However, typically the devices are reported to exhibit large threshold voltages (V TH > 20 V) and are very unstable in environmental conditions…”

“…comparison, representative density of gap states of DB-TTF single crystals [19] is plotted together with the trap DOS of DB-TTF/PS thin films (Figure 3b). The latter shows a remarkably low trap DOS, which resembles that reported by Schmidt et al [19] for DB-TTF single crystals.…”

“…comparison, representative density of gap states of DB-TTF single crystals [19] is plotted together with the trap DOS of DB-TTF/PS thin films (Figure 3b). The latter shows a remarkably low trap DOS, which resembles that reported by Schmidt et al [19] for DB-TTF single crystals. Furthermore, although the method by Lang et al leads to an underestimation of the slope of the trap DOS close to the valence-band edge, DB-TTF/PS thin films show a relatively lower trap DOS than pentacene thin films [40] and are well within the range of benchmark single crystals of other organic semiconductors.…”

Theoretical study of the effects of different substituents of tetrathiafulvalene derivatives on charge transport

“…Many OFET-based TTF derivatives have been obtained using vacuum techniques and solution, and several aromatic rings, such as benzene, naphthalene, and thiophene rings have been introduced to TTF. These derivatives exhibit excellent charge transfer properties, the highest charge mobility of which was reported to be 3.6 cm 2 /(V s) [16]. Mas-Torrent et al [17,18] studied dithiophene-tetrathiafulvalene (DT-TTF) and dibenzo-tetrathiafulvalene (DB-TTF), which contain similar molecules but present different crystal packing types, and found that different intermolecular interactions significantly influence the electronic transport properties of the compounds.…”