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A Conjugated Polymer Containing Arylazopyrazole Units in the Side Chains for Field‐Effect Transistors Optically Tunable by Near Infra‐Red Light
Author(s) -
Tian Jianwu,
Liu Zitong,
Jiang Wenlin,
Shi Dandan,
Chen Liangliang,
Zhang Xisha,
Zhang Guanxin,
Di Chongan,
Zhang Deqing
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202003706
Subject(s) - materials science , conjugated system , side chain , polymer , optoelectronics , irradiation , transistor , photochemistry , photothermal therapy , photon upconversion , photothermal effect , acceptor , photochromism , doping , nanotechnology , chemistry , quantum mechanics , voltage , condensed matter physics , physics , nuclear physics , composite material
Optically tunable field‐effect transistors (FETs) with near infra‐red (NIR) light show promising applications in various areas. Now, arylazopyrazole groups are incorporated in the side chains of a semiconducting donor–acceptor (D‐A) polymer. The cis–trans interconversion of the arylazopyrazole can be controlled by 980 nm and 808 nm NIR light irradiation, by utilizing NaYF 4 :Yb,Tm upconversion nanoparticles and the photothermal effect of conjugated D‐A polymers, respectively. This reversible transformation affects the interchain packing of the polymer thin film, which in turn reversibly tunes the semiconducting properties of the FETs by the successive 980 nm and 808 nm light irradiation. The resultant FETs display fast response to NIR light, good resistance to photofatigue, and stability in storage for up to 120 days. These unique features will be useful in future memory and bioelectronic wearable devices.