Ambipolar Single Crystal Organic Field-effect Transistors Based on (4,4^|^rsquo;-Diphenyl)dinaphtho [2,1-b:2^|^rsquo;,1^|^rsquo;-f]thieno[3,2-b]thiophene

Organic Field-effect Transistors Based on Alkylphenyl-substituted Dinaphtho[2,1-b:2′,1′-f]thieno[3,2-b]thiophenes

“…13 The resulting alkylphenyl-substituted 21DNTT derivatives were purified by column chromatography and recrystallized from toluene. All other chemicals were reagent grade or of higher purity and were used as received.…”

Electrical Performance of a Molecular Organic Semiconductor under Thermal Stress

“…It is worth noting, however, despite extensive morphological studies there is no complete understanding of how bulk thermal stability, obtained from differential scanning calorimetry, correlates to the stability of OFETs. Whereas molecular systems can be highly crystalline, [3][4][5][6] conjugated polymers suffer from the presence of amorphous domains, [7] which may be locations where heat-induced structural instability begins. These studies are fundamentally different from previous reports on temperature-dependent mobilities that have been predominantly carried out to extrapolate the activation energy of hopping transport in organic semiconductors.…”

“…One manifestation of thermal stressing effects is hysteresis in the forward and backward sweep of the transfer measurements, where the gate voltage is swept from positive to negative for the forward scan and subsequently swept negative to positive for the backward scan. Whereas molecular systems can be highly crystalline, [3][4][5][6] conjugated polymers suffer from the presence of amorphous domains, [7] which may be locations where heat-induced structural instability begins. [1] While typical inorganic semiconductors are bound by covalent bonds that provide rigid lattices, the stability of organic semiconducting materials is determined by intermolecular interactions, such as van der Waals forces, electrostatic forces and hydrogen bonding.…”