State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China.
Institute of Nanophotonics, Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes, Jinan University, Guangzhou 511443, China.
Nanoscale. 2016 Aug 25;8(34):15529-37. doi: 10.1039/c6nr04030f.
The capability to detect light over a broad waveband is highly important for practical optoelectronic applications and has been achieved with photodetectors of one-dimensional inorganic nanomaterials such as Si, ZnO, and GaN. However, achieving high speed responsivity over an entire waveband within such a photodetector remains a challenge. Here we demonstrate a broadband photodetector using a single polyaniline nanowire doped with quantum dots that is highly responsive over a broadband from 350 to 700 nm. The high responsivity is due to the high density of trapping states at the enormous interfaces between polyaniline and quantum dots. The interface trapping can effectively reduce the recombination rate and enhance the efficiency for light detection. Furthermore, a tunable spectral range can be achieved by size-based spectral tuning of quantum dots. The use of organic-inorganic hybrid polyaniline nanowires in broadband photodetection may offer novel functionalities in optoelectronic devices and circuits.
在宽波段范围内检测光的能力对于实际的光电应用非常重要，这已经可以通过一维无机纳米材料（如 Si、ZnO 和 GaN）的光电探测器来实现。然而，在这样的光电探测器中实现整个波段的高速响应仍然是一个挑战。在这里，我们展示了一种使用掺杂量子点的聚苯胺纳米线的宽带光电探测器，它在 350 到 700nm 的宽带范围内具有高响应性。高响应性归因于聚苯胺和量子点之间巨大界面处的高密度陷阶态。界面陷阶可以有效地降低复合率并提高光探测效率。此外，通过量子点的基于尺寸的光谱调谐可以实现可调谐的光谱范围。在宽带光电探测中使用有机-无机杂化聚苯胺纳米线可能会为光电设备和电路带来新的功能。
