Asymmetric Hybrid Siloxane Side Chains for Enhanced Mobility and Mechanical Properties of Diketopyrrolopyrrole‐Based Polymers. Issue 3 (8th December 2021)

• Record Type: Journal Article
• Authors: Yuan, Ye; Zhao, Fengsheng; Ding, Yafei; Zhang, Guobing; Wang, Xiaohong; Qiu, Longzhen
• Is Part Of: Macromolecular rapid communications. Volume 43:Issue 3(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-12-08
• Subjects: asymmetric side chains -- conjugated polymers -- mechanical properties -- organic field‐effect transistors; Macromolecules -- Periodicals; Polymers -- Periodicals; Chemistry -- Periodicals; 547.705
• DOI: 10.1002/marc.202100636
• Languages: English
• ISSNs: 1022-1336

Abstract

Abstract: High performance organic field effect transistor devices based on intrinsically scalable materials are of great significance in wearable electronics. In this work, an exclusive approach is reported to rationale the carrier mobility and stretchability of the conjugate polymers (CPs) by modifying the symmetry of the side chains species. Semiconductor CPs with symmetrical alkyl side chains (P(C‐C)), symmetrical siloxane side chains (P(Si‐Si)), and asymmetrical silicon‐carbon side chains (P(C‐Si)) are synthesized to investigate the influence of these side chains on the carrier mobility and mechanical behavior. The result shows that silicon‐carbon asymmetric side chains can modulate the aggregation degree of polymer chains with a coherence length of 134 Å and maintain the mobility at 0.90 cm 2 V −1 s −1 . P(C‐Si) exhibits superior tensile properties that even elongation up to 100% the value of mobility retains a majority properties. The main reason is that the lowest coherence length of P(C‐Si) polymer leads to an increased proportion of amorphous zones in its polymer film, which efficiently dissipates mechanical stresses. This study provides an efficient strategy for the design and synthesis of the CPs with high carrier transport properties‐mechanical stability. Abstract : Carrier mobility and stretchability of the conjugated polymers are modulated by modifying the symmetry in species of the side chains. The asymmetric side chains can regulate the aggregation of the molecular chains with a coherent length of 134 Å. P(C‐Si) stretches to 100% and the initial mobility values of 86% and 56% are maintained in vertical and parallel directions.