An unprecedented quinoid–donor–acceptor strategy to boost the carrier mobilities of semiconducting polymers for organic field-effect transistors

Abstract

Quinoidal-aromatic conjugated polymers hold great application potential in organic field-effect transistors (OFETs). However, the development of high mobility quinoidal-aromatic conjugated polymers still lags behind the more popular donor-acceptor (D-A) conjugated...

Synthetic strategies, molecular engineering and applications of semiconducting polymers based on diarylethylene units in electronic devices

“…Conjugated polymers incorporating quinoid building blocks also attracted widespread attention due to their unique optical, electrical, and magnetic properties. 133 Facile resonance between electroactive aromatics and quinoid units brings about the minimization of bond length alternation, which helps in lowering the LOMO energy levels and reducing the energy gaps of polymers. The effective π-orbital overlap and extended π-electron delocalization are capable of improving charge the carrier transport properties.…”

Isomer-Free Quinoidal Building Block Employing 3,4-Phenylenedioxythiophene Unit with Mesomeric Effect for Low-Bandgap Quinoidal Conjugated Polymers

“…Quinoidal conjugated polymers (QCPs) are considered promising semiconducting materials as their attractive properties differ from those of aromatic-ring-based conjugated polymers due to the extended π-conjugation pathway through carbon–carbon double bonds (CC) in each aryl ring. − The double-bond linkage between rings improves molecular planarity, which facilitates outstanding π-electron delocalization over the entire conjugated backbone while also being favorable for molecular π–π stacking to enhance electron hopping. Such chemical structures allow QCPs to obtain interesting properties such as effective charge carrier pathways showing high performance in optoelectronic devices, − long-wavelength light absorption characteristics, − and appearance of stable diradicals. , …”

para-Azaquinodimethane based quinoidal polymers for opto-electronic applications: impact of donor units on the opto-electronic properties

“…p-AQM also presents advantages such as ease of synthesis, ease of backbone tuning, and rigid and coplanar conformation that can be enhanced by noncovalent intramolecular SÁ Á ÁN interactions with neighbour thiophene units. 14,[17][18][19] Noticeably, an unconventional trend was observed in quinoidal-donor (Q-D) p-AQM copolymers, where the bandgap increases upon increasing the number of thiophenes from two to four in the main chain. 14 This effect was attributed to the dilution of the quinoidal character of the alternated Q-D copolymer with the extension of the aromatic comonomer, similar to what is observed in D-A alternating copolymers.…”