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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Efficient and readily tuneable near-infrared photodetection up to 1500 nm enabled by thiadiazoloquinoxaline-based push-pull type conjugated polymers
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Efficient and readily tuneable near-infrared photodetection up to 1500 nm enabled by thiadiazoloquinoxaline-based push-pull type conjugated polymers

机译：高效且易于可调可调近1500nm的近氮喹氧喹啉的推拉式共轭聚合物

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摘要

The majority of bulk heterojunction near-infrared organic photodetectors (NIR-OPDs) have an absorption window up to 1000 nm (1.2 eV) due to the scarcity of suitable NIR-absorbing electron donor polymers and the challenging energy alignment and/or blend miscibility with electron acceptor materials, strongly complicating to move beyond this wavelength range. Nonetheless, extension of the detectivity further into the NIR is important for applications such as bio-imaging, pulse oximetry and industrial sorting. Herein, we illustrate that [1,2,5]thiadiazolo[3,4-g]quinoxaline (TQ) is an excellent building block for the development of ultra-low bandgap copolymers to achieve tuneable NIR photodetection beyond 1000 nm. Three TQ monomers with different side chain patterns are synthesized and combined with carefully selected electron rich subunits to yield push-pull type copolymers with an optical gap ranging from 1.14 to 0.87 eV. The highest gap material affords the best OPD performance, with a peak specific detectivity of 3 x 10(11)Jones at 960 nm (at -2 V bias). The other polymers show <1 eV optical gaps and specific detectivities exceeding 10(10)Jones up to 1400 nm (at -2 V bias). These values are among the highest reported so far for NIR-OPDs in the wavelength range beyond 1000 nm.
机译：大多数散装异质结近红外有机光电探测器（NIR-OPD）具有高达1000nm（1.2eV）的吸收窗，由于合适的NIR吸收电子给体聚合物和挑战能量对准和/或混合可混合性电子受体材料，强烈复杂化以超出该波长范围。尽管如此，进一步进入NIR的探测器的延伸对于诸如生物成像，脉冲血氧血管和工业分类等应用非常重要。在此，我们说明[1,2,5]噻二唑唑[3,4-G]喹喔啉（TQ）是用于显影超低带隙共聚物以实现超过1000nm的可调性Nir光电探测的优异结构块。合成三种具有不同侧链图案的TQ单体并结合精心选择的电子富亚基，得到推挽式共聚物，光间隙范围为1.14至0.87eV。最高的间隙材料提供最佳的OPD性能，在960nm处具有3×10（11）琼斯的峰值特异性探测器（在-2 v偏置）。其他聚合物显示出<1 EV光学间隙和超过10（10）琼松的特定探测，高达1400nm（在-2V偏压下）。这些值是迄今为止最高报告的，到目前为止波长范围超过1000nm的NIR-OPD。

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