Photodetectors (PDs) with infrared (IR) response have extensive industrial and scientific applications. Broadband polymer PDs that operate at room temperature have drawn the greatest attention in the past years. In this study, solution-processed polymer PDs with a spectral response ranging from 350 nm to 2500 nm are reported. The low bandgap donor–acceptor (D–A) conjugated copolymer contributes to the IR photo-response. Implementation of a bulk heterojunction device structure with polypyrrole as an interfacial layer to match the energy level of the low bandgap D–A conjugated copolymer and the Ba/Al bi-cathode to compress dark current gave rise to a large photocurrent to dark current ratio, which resulted in detectivities greater than 10¹¹ Jones (1 Jones = 1 cm Hz^1/2 W⁻¹) at wavelengths ranging from 350 nm to 2500 nm. Thus, our finding of utilization of bulk heterojunction composite consisting of a D–A low bandgap polymer blended with a fullerene derivative provides a facile way to detect IR radiation, indicating that broadband polymer PDs are promising for photoelectronic technology in the future.

中文翻译：

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溶液处理的宽带聚合物光电探测器通过低带隙供体-受体共轭共聚物的光谱响应高达2.5μm

具有红外（IR）响应的光电探测器（PD）具有广泛的工业和科学应用。在过去的几年中，在室温下工作的宽带聚合物PD引起了最大的关注。在这项研究中，据报道，溶液处理的聚合物PD的光谱响应范围为350 nm至2500 nm。低带隙供体-受体（DA）共轭共聚物有助于红外光响应。用聚吡咯作为界面层来实现体异质结器件结构的实现，以匹配低带隙D–A共轭共聚物和Ba / Al双阴极的能级以压缩暗电流，从而产生了大的光电流与暗电流之比，导致检出率大于10 ¹¹琼斯（1琼斯= 1 cm Hz ^1/2 W ^-1）在350 nm至2500 nm的波长范围内。因此，我们发现利用由D–A低带隙聚合物与富勒烯衍生物混合而成的本体异质结复合材料提供了一种简便的方法来检测IR辐射，这表明宽带聚合物PD有望在未来用于光电技术。