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Ultrasensitive flexible broadband photodetectors achieving pA scale dark current
npj Flexible Electronics ( IF 14.6 ) Pub Date : 2017-10-16 , DOI: 10.1038/s41528-017-0005-x
Xiao Luo , Feiyu Zhao , Lili Du , Wenli Lv , Kun Xu , Yingquan Peng , Ying Wang , Feiping Lu

Organolead halide perovskite is a newly emerging low-cost, solution-processable material with a broadband absorption from the ultraviolet (UV) to visible (Vis) region, which has attracted a great deal of interest in high-performance optoelectronic devices. However, some practicable applications need a cover of UV–Vis–NIR region for photoelectric conversion, a task that remains a significant challenge for further extending the absorption toward the near-infrared radiation (NIR) region. Here, to the best of our knowledge, we prove for the first time an ultrasensitive flexible broadband photodetector based on porous organolead perovskite-phthalocyanine heterostructure, which combines the synergetic properties of high UV–Vis absorbance of perovskite with enhanced NIR absorption for triclinic lead phthalocyanine. The photosensitivity of the as-prepared devices reaches up to 104 at a low intensity of 10 mW cm−2, which is among the largest values reported for broadband photodetectors. Significantly, performed at room temperature, the device achieves a pA scale dark current along with an ultrafast response speed of less than 0.6 ms for as-adopted full spectra. Our results provide an easy and promising route to develop low-cost, flexible and highly sensitive UV–Vis–NIR photodetectors.



中文翻译:

超灵敏的柔性宽带光电探测器可实现pA级暗电流

有机油卤化物钙钛矿是一种新兴的低成本,可溶液处理的材料,具有从紫外(UV)到可见(Vis)区域的宽带吸收能力,引起了人们对高性能光电器件的极大兴趣。但是,在某些实际应用中,需要覆盖UV-Vis-NIR区域以进行光电转换,这对于将吸收进一步扩展到近红外辐射(NIR)区域仍然是一项巨大的挑战。在此,就我们所知,我们首次证明了一种基于多孔有机铅钙钛矿-酞菁异质结构的超灵敏柔性宽带光电探测器,该探测器结合了钙钛矿的高UV-Vis吸收性能和对三斜晶酞菁铅的增强的近红外吸收率。 。在10 mW cm -2的低强度下显示为4,这是宽带光电探测器报告的最大值之一。值得注意的是,该器件在室温下执行时,对于已采用的全光谱,该器件实现了pA级的暗电流以及小于0.6 ms的超快响应速度。我们的结果为开发低成本,灵活和高度灵敏的UV-Vis-NIR光电探测器提供了一条简单而有希望的途径。

更新日期:2019-05-16
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