A Structurally Simple but High‐Performing Donor–Acceptor Polymer for Field‐Effect Transistor Applications

Abstract

A straightforward synthesis is reported for four structurally simple donor–acceptor conjugated polymers based on an alkylated difluorobenzotriazole and either unsubstituted bithiophene (T2) or thienylvinylthiophene (TVT) co‐monomers. Two solubilizing sidechains are investigated in which the position of the branching point is moved away from the conjugated backbone. Optoelectronic measurements and density functional theory calculations show very similar energetic properties between the polymers, with a slightly narrower bandgap for the vinylene incorporating TVT polymers as a result of extended conjugation. Transistor measurements demonstrate that the simplest polymer, containing a readily available 2‐decyltetradecyl sidechain with a T2 co‐monomer, exhibits the best device performance, with an average saturated mobility of 0.2 cm2 V−1 s−1.

N-type polymer semiconductors incorporating para, meta, and ortho-carborane in the conjugated backbone

“…The absence of a peak shoulder or an additional low-energy peakotherwise typical for ordered conjugated polymers -once again suggests disordered amorphous films. [50] Figure 1. Normalised absorption (solid lines) and emission (dashed lines, λex = 375 nm) spectra of respective polymer in chloroform (solution) or spun-cast thin film.…”

Thermally Stable and High‐Mobility Dithienopyran‐Based Copolymers: How Donor–Acceptor‐ and Donor–Donor‐Type Structures Differ in Thin‐Film Transistors

“…Notably, in both the solution and thin‐film state, P4 showed somewhat redshifted absorption profiles compared with P3 because the TVT moiety has a longer conjugation length than the T2 unit. [ 16 ] P3 and P4 exhibited relatively small redshift profiles without a vibration peak from the solution to the solid state, indicating a less dense solid packing/aggregation relative to P1 and P2.…”

Biodegradable Materials for Transient Organic Transistors

“…Careful tuning of many of the important properties of polymers, such as bandgap, energy levels, charge transport and polymer solubility can be achieved by a judicious choice of donor and acceptor monomers. [ 72 ] Popular electron‐deficient acceptors for OFETs include diketopyrrolopyrrole (DPP), isoindigo (IID), NDI and benzothiadiazole (BTz). These are coupled with donor units, such as thiophene, selenophene, bithiophene, thienothiophene (TT), etc., to develop state‐of‐the‐art D–A polymers.…”