Zhengbang Chen, Shuixiu Lin, Longfei Zhang and Lingyu Wan
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引用次数: 0
Abstract
We present a novel ZnO/Au/Ti/p-GaN self-powered ultraviolet photodetector (UVPD) featuring a sandwich structure of asymmetric interdigitated electrodes. This unique design skillfully integrates the conventional vertically-structured ZnO/p-GaN UVPD, asymmetric Au/ZnO/Au UVPD, and asymmetric Ti/p-GaN/Ti UVPD into a single device, which effectively enhances the separation and collection efficiency of photogenerated carriers while reducing their composite depletion through the coupling of the built-in electric fields of the Schottky junctions (ZnO/Au, p-GaN/Ti) and the heterojunction (ZnO/p-GaN), creating a synergistic enhancement in performance. At 0 bias, while achieving a fast response speed (0.98/0.63 ms), the ZnO/Au/Ti/p-GaN UVPD also shows improvements in light-to-dark ratios by 7.78, 15.79, and 20.0 times, and in responsivity peaks by 2.7, 4.12, and 152.84 times, compared to the ZnO/p-GaN UVPD, the MSM ZnO UVPD, and the MSM GaN UVPD, respectively. Our proposed sandwich structure of asymmetric interdigitated electrodes offers significant performance enhancement and a simple preparation process, and it can also be applied to other semiconductor heterojunctions, demonstrating wide practical application potential. This work provides a valuable strategy for the development of high-performance and low-cost self-powered UV photodetectors.
期刊介绍:
The Journal of Materials Chemistry is divided into three distinct sections, A, B, and C, each catering to specific applications of the materials under study:
Journal of Materials Chemistry A focuses primarily on materials intended for applications in energy and sustainability.
Journal of Materials Chemistry B specializes in materials designed for applications in biology and medicine.
Journal of Materials Chemistry C is dedicated to materials suitable for applications in optical, magnetic, and electronic devices.
Example topic areas within the scope of Journal of Materials Chemistry C are listed below. This list is neither exhaustive nor exclusive.
Bioelectronics
Conductors
Detectors
Dielectrics
Displays
Ferroelectrics
Lasers
LEDs
Lighting
Liquid crystals
Memory
Metamaterials
Multiferroics
Photonics
Photovoltaics
Semiconductors
Sensors
Single molecule conductors
Spintronics
Superconductors
Thermoelectrics
Topological insulators
Transistors