Accompanying Structural Transformations in Polarity Switching of Heavily Doped Conjugated Polymers.

Despite significant recent advancements in highly functional organic semiconductors (OSCs), the n-type OSCs reported to date lag behind their p-type counterparts in terms of long-term environmental stability. As an alternative approach to n-type materials, a few p-type polymers have been shown to undergo dramatic transitions in their charge carrier polarity to n-type through transition metal-incorporated Lewis acid doping. Although the concept of polarity switching is promising, its unclear chemical origin-particularly from a materials science perspective-limits its potential as an n-type counterpart.

Green Synthesis of High-Performance Conjugated Polymers through Optimizing Fused-Ring Structures and Molecular Weights for Organic Field-Effect Transistors.

Facile and ecofriendly syntheses are of vital importance to the development of organic semiconductors. Herein, we present a straightforward and green approach for preparing high-performance conjugated polymers. A series of conjugated polymers based on three commercially available multifused rings and benzodifuranedione were designed and synthesized for application in organic field-effect transistors (OFETs).

"Popping the Ion-Basket": Enhancing Thermoelectric Performance of Conjugated Polymers by Blending with Latently Dissociable Perovskite Quantum Dots.

A novel additive method to boost the Seebeck coefficient of doped conjugated polymers without a significant loss in electrical conductivity is demonstrated. Perovskite (CsPbBr) quantum dots (QDs) passivated by ligands with long alkyl chains are mixed with a conjugated polymer in a solution phase to form polymer-QD blend films. Solution sequential doping of the blend film with AuCl solution not only doped the conjugated polymer but also decomposed the QDs, resulting in a doped conjugated polymer film embedded with separated ions dissociated from the QDs.

Stepwise Curing Induced All-Stretchable Thermoelectric Generator of High Power Density.

In this study, a wearable and highly stretchable organic thermoelectric (TE) generator with a notable power density is developed. A highly stretchable and solution-processable TE/electrode pattern is realized by stepwise-curing elastomeric and conducting network. Significant advances in the TE or electrical properties are obtained for these stretchable patterns through post-activation treatment, which creates long-range charge transport pathways without degrading pre-established elastomeric networks.

Disordered Phase-Assisted Growth of Organic Semiconductor Crystals on Self-Assembled Monolayer Templates.

Achieving high mobility and bias stability is a challenging obstacle in the advancement of organic thin-film transistors (OTFTs). To this end, the fabrication of high-quality organic semiconductor (OSC) thin films is critical for OTFTs. Self-assembled monolayers (SAMs) have been used as growth templates for high-crystalline OSC thin films.