High-Performance, Stable Organic Thin-Film Field-Effect Transistors Based on Bis-5‘-alkylthiophen-2‘-yl-2,6-anthracene Semiconductors

Abstract

The development of new organic semiconductors with improved electrical performance and enhanced environmental stability is the focus of considerable research activity. This communication presents the design, synthesis, and device stability data for novel bis-5'-alkylthiophen-2'yl-2,6-anthracene organic semiconductors. When incorporated into thin-film field-effect transistors, mobilities as high as 0.5 cm2/Vs and on/off current ratios greater than 107 are observed. We have investigated device stability in terms of both shelf life and operating lifetime. Devices incorporating the reported semiconductors display an average field-effect mobility of 0.4 cm2/Vs for DHTAnt and an on/off current ratio of 106 even after 15 months of storage. Furthermore, there is no decrease in performance during continuous operation of the devices over several thousand cycles.

Directly patternable, highly conducting polymers for broad applications in organic electronics

“…Fig. 2 contains representative the I-V characteristics of bottom-contact OTFTs with untreated and DCA-treated PANI-PAAMPSA as source and drain electrodes and dihexylthiophene anthracene, DHT-ANT (27), as the active layer; the corresponding transfer characteristics are also included. The field-modulated current from the device with untreated PANI-PAAMPSA electrodes suffers from significant hysteresis and we observe severe current crowding at gate voltages beyond −5 V because PANI-PAAMPSA electrodes are resistive.…”

Chain Length Effect of Dialkoxynaphthalene End-Capped Divinylbenzene for OTFT

“…A large number of oligomers have demonstrated interesting performances in OTFTs, such as fluorene, acenes and carbazole derivatives. [18][19][20][21] The synthesis of new π-conjugated units that could be incorporated in oligomeric structures could be desirable for significant optimization of OTFT performances and for a better understanding of the structure-property relationship.…”

Semiconducting Organic Molecular Materials

“…By derivatization of the backbone, various materials can be prepared. For example Meng et al [17] prepared thiophene-antracene oligomers, Fig. 3 (7) which both exhibited a bandgap around 2.8 eV, larger than of pentacene (1.8 eV).…”

“…A simple example to tune the energy gap and levels of organic semiconductors is to use star organic semiconductors as the parent cores to rationally modify or structurally reorganize them. For example, judicious choice of appropriate conjugation units (such as acenes or oligothiophene cores) and incorporation of some weakly electron-donating groups (such as double/triple carbon bond or chalcogen atoms) and side chains in the molecule serve to lower the HOMO energy [17,[32][33][34][35]. Introducing strong electron-withdrawing groups to stabilize the organic anions against oxygen and water is another effective approach for highly stable n-type semiconductors [23,36,37].…”