Jin He, Zhi Wang, Yerun Gao, Bijin Xiong, Ming Shao* and Zhong’an Li*,
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Ladder-Type π-Conjugated Polysquaraines for Near-Infrared Organic Photodetectors
Near-infrared organic photodetectors (NIR OPDs) have gained widespread attention due to the rapidly growing demand for portable, lightweight, and low-cost sensors. However, the development of high-performance NIR organic semiconductors remains challenging. Herein, we report two new ladder-type conjugated pyrrolic polysquaraines simply prepared by polycondensation, namely, PSQ-IDT and PSQ-IDTT, which exhibit narrow optical band gaps of 1.26 and 1.28 eV, respectively. Both polysquaraines have good compatibility with the PC61BM acceptor, and the resulting NIR OPDs exhibit a wide detection range covering 400–1000 nm. We demonstrate that the fused ring bridge has a critical effect on the optical and electronic properties of polysquaraines by regulating the polymer backbone geometry. As a result, the PSQ-IDT OPD offers a better photodetection performance than PSQ-IDTT, with specific detectivity over 1011 Jones in 400–1000 nm under the self-powered mode and fast response rise and fall times of 3.9 and 3.5 μs, making it a good material candidate for NIR OPDs.
期刊介绍：
Macromolecules publishes original, fundamental, and impactful research on all aspects of polymer science. Topics of interest include synthesis (e.g., controlled polymerizations, polymerization catalysis, post polymerization modification, new monomer structures and polymer architectures, and polymerization mechanisms/kinetics analysis); phase behavior, thermodynamics, dynamic, and ordering/disordering phenomena (e.g., self-assembly, gelation, crystallization, solution/melt/solid-state characteristics); structure and properties (e.g., mechanical and rheological properties, surface/interfacial characteristics, electronic and transport properties); new state of the art characterization (e.g., spectroscopy, scattering, microscopy, rheology), simulation (e.g., Monte Carlo, molecular dynamics, multi-scale/coarse-grained modeling), and theoretical methods. Renewable/sustainable polymers, polymer networks, responsive polymers, electro-, magneto- and opto-active macromolecules, inorganic polymers, charge-transporting polymers (ion-containing, semiconducting, and conducting), nanostructured polymers, and polymer composites are also of interest. Typical papers published in Macromolecules showcase important and innovative concepts, experimental methods/observations, and theoretical/computational approaches that demonstrate a fundamental advance in the understanding of polymers.
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