Photopatternable and Stretchable Random Polymer Semiconductor via Oxetane Side‐Chain Engineering
Abstract
ABSTRACT Flexible electronic devices demand semiconducting materials that combine high charge transport performance, mechanical resilience, and compatibility with advanced patterning techniques. Conventional photolithography is incompatible with polymer semiconductors, and existing photo‐crosslinking strategies often compromise mobility due to backbone side reactions. Here we report an oxetane side‑chain engineering strategy that enables a diketopyrrolopyrrole (DPP)‑based random terpolymer, PDPPSe‑oxe17 , to form robust crosslinked networks under mild UV irradiation with iodonium salt photoinitiators. Controlled incorporation of oxetane groups (17 mol%) preserves the electronic structure of the conjugated backbone while enabling rapid ring‑opening polymerization for high‑resolution photopatterning. The polymer exhibits a high hole mobility of 2.19 ± 0.28 cm 2 V − 1 s − 1 , which slightly increases to 2.27 ± 0.19 cm 2 V − 1 s − 1 after crosslinking—representing one of the highest mobilities reported for photopatterned OFETs. The resulting 3D polyoxetane network imparts good mechanical robustness, allowing films to withstand 108% strain and retain ∼85% and ∼76% mobility at 30% and 50% strain. Even at 100% strain, the mobility remains ∼1.4 ± 0.12 cm 2 V − 1 s − 1 , whereas non‑crosslinked counterparts retain only ∼3% of their initial mobility. This work establishes a generalizable molecular design principle for intrinsically photopatternable and stretchable polymer semiconductors.
Article Details
Authors (12)
Xinyi Luo
Zhaoqiong Zhou
State Key Laboratory of Natural Product Chemistry Key Laboratory of Special Function Materials and Structure Design College of Chemistry and Chemical Engineering Lanzhou University Lanzhou China
Nan Luo
Jiulong Zhang
State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Special Function Materials and Structure Design, College of Chemistry and Chemical Engineering
Tianqiang Cui
State Key Laboratory of Applied Organic Chemistry (SKLAOC), Key Laboratory of Special Function Materials and Structure Design (MOE), College of Chemistry and Chemical Engineering
Cheng Shan Yuan
State Key Laboratory of Natural Product Chemistry Key Laboratory of Special Function Materials and Structure Design College of Chemistry and Chemical Engineering Lanzhou University Lanzhou China
Fengjiao Zhang
Zhiguo Zhang
Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering
Xiangfeng Shao
State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Special Function Materials and Structure Design, College of Chemistry and Chemical Engineering
Lang Jiang
Beijing National Laboratory for Molecular Sciences, CAS Center of Excellence in Molecular Science
Hao‐Li Zhang
State Key Laboratory of Natural Product Chemistry Key Laboratory of Special Function Materials and Structure Design (MOE) College of Chemistry and Chemical Engineering Lanzhou University Lanzhou P.R. China
Zitong Liu
State Key Laboratory of Natural Product Chemistry, Key Laboratory of Special Function Materials and Structure Design (MOE), College of Chemistry and Chemical Engineering