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Jianwei Ben 《中国物理 B》2022,31(7):76104-076104
Introducing voids into AlN layer at a certain height using a simple method is meaningful but challenging. In this work, the AlN/sapphire template with AlN interlayer structure was designed and grown by metal-organic chemical vapor deposition. Then, the AlN template was annealed at 1700 ℃ for an hour to introduce the voids. It was found that voids were formed in the AlN layer after high-temperature annealing and they were mainly distributed around the AlN interlayer. Meanwhile, the dislocation density of the AlN template decreased from 5.26×109 cm-2 to 5.10×108 cm-2. This work provides a possible method to introduce voids into AlN layer at a designated height, which will benefit the design of AlN-based devices. 相似文献
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A self-driven photodetector based on a SnS2/WS2 van der Waals heterojunction with an Al2O3 capping layer 下载免费PDF全文
Hsiang-Chun Wang 《中国物理 B》2023,32(1):18504-018504
Photodetectors based on two-dimensional (2D) materials have attracted considerable attention because of their unique properties. To further improve the performance of self-driven photodetectors based on van der Waals heterojunctions, a conductive band minimum (CBM) matched self-driven SnS2/WS2 van der Waals heterojunction photodetector based on a SiO2/Si substrate has been designed. The device exhibits a positive current at zero voltage under 365 nm laser illumination. This is attributed to the built-in electric field at the interface of the SnS2 and WS2 layer, which will separate and transport the photogenerated carriers, even at zero bias voltage. In addition, the Al2O3 layer is covered by the surface of the SnS2/WS2 photodetector to further improve the performance, because the Al2O3 layer will introduce tensile stress on the surface of the 2D materials leading to a higher electron concentration and smaller effective mass of electrons in the films. This work provides an idea for the research of self-driven photodetectors based on a van der Waals heterogeneous junction. 相似文献
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