Xi Zhaoying, Liu Zeng, Yang Lili, Tang Kai, Li Lei, Shen Gaohui, Zhang Maolin, Li Shan, Guo Yufeng, Tang Weihua
Innovation Center for Gallium Oxide Semiconductor (IC-GAO), College of Integrated Circuit Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China.
National and Local Joint Engineering Laboratory for RF Integration and Micro-Assembly Technologies, Nanjing University of Posts and Telecommunications, Nanjing 210023, China.
ACS Appl Mater Interfaces. 2023 Aug 30;15(34):40744-40752. doi: 10.1021/acsami.3c07597. Epub 2023 Aug 17.
Solar-blind UV photodetectors have outstanding reliability and sensitivity in flame detection without interference from other signals and response quickly. Herein, we fabricated a solar-blind UV photodetector based on a LaO/ε-GaO p-n heterojunction with a typical type-II band alignment. Benefiting from the photovoltaic effect formed by the space charge region across the junction interface, the photodetector exhibited a self-powered photocurrent of 1.4 nA at zero bias. Besides, this photodetector demonstrated excellent photo-to-dark current ratio of 2.68 × 10 under 254 nm UV light illumination and at a bias of 5 V, and a high specific detectivity of 2.31 × 10 Jones and large responsivity of 1.67 mA/W were achieved. Importantly, the LaO/ε-GaO heterojunction photodetector can rapidly respond to flames in milliseconds without any applied biases. Based on the performances described above, this novel LaO/ε-GaO heterojunction is expected to be a candidate for future energy-efficient fire detection.
日盲型紫外光电探测器在火焰探测中具有出色的可靠性和灵敏度，不受其他信号干扰且响应迅速。在此，我们基于具有典型II型能带排列的LaO/ε-GaO p-n异质结制备了一种日盲型紫外光电探测器。得益于结界面处空间电荷区形成的光伏效应，该光电探测器在零偏压下呈现出1.4 nA的自驱动光电流。此外，该光电探测器在254 nm紫外光照射和5 V偏压下表现出2.68×10的优异光暗电流比，实现了2.31×10琼斯的高比探测率和1.67 mA/W的大响应度。重要的是，LaO/ε-GaO异质结光电探测器无需任何外加偏压就能在毫秒内快速响应火焰。基于上述性能，这种新型的LaO/ε-GaO异质结有望成为未来节能火灾探测的候选材料。
