用于可拉伸有机场效应晶体管的金属超分子棒-线圈嵌段共聚物薄膜《Macromolecules》

Metallo-Supramolecular Rod–Coil Block Copolymer Thin Films for Stretchable Organic Field Effect Transistor Application

Wei-Ni Wu, Tsung-Han Tu, Chiao-Hsuan Pai, Kuan-Heng Cheng, Shih-Huang Tung, Yi-Tsu Chan*, and Cheng-Liang Liu*

Department of Materials Science and Engineering, National Taiwan University, Taipei10617, Taiwan

Macromolecules 2022, XXXX, XXX, XXX-XXX

Publication Date: November 17, 2022

https://doi.org/10.1021/acs.macromol.2c00957

Abstract

Herein, to decrease the synthetic burden of the rod–coil diblock copolymers, the coordination-driven self-assembly approach is utilized to readily construct a series of polystyrene (PS)-block-poly(3-hexylthiophene) (P3HT) copolymers with dynamic heteroleptic coordination bonds between the two blocks. In detail, the chain length of the PS is varied for a fixed P3HT chain length to produce block copolymers, namely, PS85–Zn–P3HT187 (P1) and PS161–Zn–P3HT187 (P2), with comparable electrical performance to that of homopolymer P3HT (P0) in the unstrained state, along with enhanced crack onset strain and much less reduced mobility under 25–100% strain. The ability to maintain the charge transport characteristics is due to the longer coil chain length and amorphous PS regions for the dissipation of strain energy. The organic field effect transistors of P2 with a longer PS segment show only a slight change in mobility from 5.48 × 10–3 to 1.40 × 10–3 cm2 V–1 s–1 under 25–100% and maintain this mobility even after being subjected to 100 repeated stretching/releasing cycles at 50% strain. This proof-of-concept demonstration of the proposed molecular engineering approach based on the metallo-supramolecular method provides a suitable route to the molecular design of stretchable polymer semiconductors with balanced mechanical and electrical behaviors.

SUBJECTS:

• Charge transport,

• Copolymers,

• Organic polymers,

• Polymers,

• Thin films