Plasmonic hot-hole injection combined with patterned substrate for performance improvement in trapezoidal PIN GaN microwire self-powered ultraviolet photodetector. (15th December 2022)

• Record Type: Journal Article
• Authors: Chen, Kai; Deng, Congcong; Zou, Can; Zhao, Zixuan; Liu, Qing; Wang, Xingfu; He, Longfei; Gao, Fangliang; Zhao, Wei; Li, Shuti
• Is Part Of: Nano energy. Volume 104(2022)Part A
• Publication Date: 2022-12-15
• Subjects: LSPR -- Hot-hole injection -- Patterned substrates -- Enhanced light scattering -- Self-powered devices -- Ultraviolet photodetectors; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2022.107926
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Harvesting nonequilibrium carriers from plasmonic-metal nanostructures offers unique strategies for improving the performance of various photodetectors. Most studies have focused on the capture and conversion of plasmonic hot-electron. Here, we report a hot-hole injection enhanced self-powered UV photodetector based on trapezoidal PIN GaN microwire modified with Au nanoparticles (NPs) on patterned sapphire substrate. Efficient injection of hot holes and enhanced light scattering of plasmonic Au NPs combined with patterned substrate that increases the light absorption of the device considerably improve the performance of the photodetector. The responsivity at 325 nm reaches up to 1.9 A W −1, with an ideal detectivity at 5.25 × 10 11 Jones without a power supply, which is well beyond the photodetectors without Au NPs modification on flat substrate. Moreover, our device also has a high on/off ratio (∼3 × 10 5 ) and fast response speed (rise/fall time of 0.25/0.38 ms). This work demonstrates potential applications, such as energy-saving communication, environmental monitoring and self-powered integrated systems and provides guidance for subsequent photodetectors that operate by hot-hole collection. Graphical Abstract: Hot-hole-injected self-powered UV photodetector combining Au nanoparticles with patterned substrates was introduced. The use of aluminum plated patterned substrates with a high diffuse reflectance greatly improved the light absorption efficiency of the photodetector. Besides, the efficient injection of hot holes and enhanced light scattering of Au nanoparticles further enhanced the performance of the photodetector. The mechanisms related to performance enhancement of UV photodetectors has been systematically studied. As a result, the responsivity of photodetector reaches up to 1.9 A W −1 with a detectivity of 5.25 × 10 11 Jones, on/off ratio of 3 × 10 5 and rise/fall time of 0.25/0.38 ms in self-powered mode. ga1 Highlights: Hot-hole-injected self-powered UV photodetector combining Au nanoparticles with patterned substrates was introduced. The use of aluminum plated patterned substrate with a high diffuse reflectivity greatly improved the light absorption efficiency of the photodetector, which approximately doubled the performance of devices using conventional planar substrates. The efficient injection of hot holes and enhanced light scattering from Au nanoparticles further enhanced the performance of the photodetector with responsivity of 1.9 A W -1, a detectivity of 5.25 × 10 11 Jones, on/off ratio of 3 × 10 5 and rise/fall time of 0.25/0.38 ms in self-powered mode. The use of these two strategies provides guidance for photodetectors that operate through hot hole collection.