Molecular-dipole oriented universal growth of conjugated polymers into semiconducting single-crystal thin films

Résumé fourni par la source

Precise control over crystallinity and morphology of conjugated polymers (CPs) is essential for progressing organic electronics. However, manufacturing single-crystal thin films of CPs presents substantial challenges due to their complex molecular structures, distorted chain conformations, and unbalanced crystallization kinetics. In this work, we demonstrate a universal nanoconfined molecular-dipole orientating strategy to craft high-quality single-crystal thin films for a variety of CPs, spanning from traditional thiophene- and theinothiophene-based homopolymers to diketopyrrolopyrrole- (i.e., p-type) and naphthalene-based (i.e., n-type) donor-acceptor copolymers. Central to this strategy is the synergetic manipulations of molecular dipoles, π-π stackings, and alkyl-alkyl interactions of CPs within our rationally-designed spatial-electrostatic confinement capacitor, which facilitates the rotation of conjugated backbones and the alignment of π-π stackings into microscale-sized single-crystal thin films. A minimal energetic disorder of 25 meV that below the thermal fluctuation energy kBT at room temperature, as well as an excellent transistor mobility of 15.5 cm2V−1s−1 are achieved, marking a significant step towards controllable growths of conjugated-polymer single-crystal thin films that hold a cornerstone for high-performance organic electronic devices. Precise control over the characteristics of crystalline conjugated polymers is essential for organic electronic, but this is complex. Here, the authors report a molecular dipole orienting strategy for preparation of single-crystal thin films with high transistor mobility.

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