Polypyrrole (PPy) is a conductive polymer and widely applied in different applications owing to its broadband absorption in the UV–visible, near-infrared (NIR), and short-wave-infrared (SWIR) spectrum, excellent conductivity, and strong photothermal effect. In this work, we explored for the first time the photothermal effect of PPy nanoparticles (PPy-NPs) in a photothermal-induced detector structure and developed a new type of air-stable hybrid PPy-NPs/Pt photodetector (PD) with NIR/SWIR sensitivity. By combining PPy-NPs with a platinum (Pt)-resistive pattern, we fabricated PPy-NPs/Pt PDs that are sensitive to illumination in the wavelength range from 800 to 2000 nm. Under the illumination of λ = 1.5 μm, the maximum photoresponsivity was measured to be ∼1.3 A/W with a 131 μs photoresponse rise time. Owing to the excellent material stability from both PPy-NPs and the Pt pattern, the current photodetectors show long-term stable photoresponsivity when they were stored in air without encapsulation. The results suggest that the PPy-NPs/Pt hybrid PDs are promising candidates for a new type of low-cost and broadband due to their multiple advantages such as free of toxic heavy metals, air stability, and solution processing.

中文翻译：

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聚吡咯纳米结构光热效应驱动的长期稳定近红外-短波红外光电探测器

聚吡咯 (PPy) 是一种导电聚合物，由于其在紫外-可见光、近红外 (NIR) 和短波红外 (SWIR) 光谱中的宽带吸收、优异的导电性和强烈的光热效应而被广泛应用于不同的应用领域. 在这项工作中，我们首次探索了光热诱导探测器结构中 PPy 纳米粒子 (PPy-NPs) 的光热效应，并开发了一种新型的空气稳定混合 PPy-NPs/Pt 光电探测器 (PD)，具有 NIR/短波红外灵敏度。通过将 PPy-NPs 与铂 (Pt) 电阻图案相结合，我们制造了对 800 至 2000 nm 波长范围内的照明敏感的 PPy-NPs/Pt PD。在 λ = 1.5 μm 的光照下，测得的最大光响应率为 ~1.3 A/W，光响应上升时间为 131 μs。由于 PPy-NPs 和 Pt 图案的优异材料稳定性，当前的光电探测器在没有封装的情况下储存在空气中时表现出长期稳定的光响应性。结果表明，PPy-NPs/Pt 混合 PDs 具有无毒重金属、空气稳定性和溶液处理等多重优势，是一种新型低成本和宽带的有希望的候选材料。