This study pioneers a high-performance UV polarization-sensitive photodetector by ingeniously integrating noncentrosymmetric metal nanostructures into a graphene(Gr)/Al_(2)O_(3)/GaN heterojunction.Unlike conventional ...This study pioneers a high-performance UV polarization-sensitive photodetector by ingeniously integrating noncentrosymmetric metal nanostructures into a graphene(Gr)/Al_(2)O_(3)/GaN heterojunction.Unlike conventional approaches constrained by graphene's intrinsic isotropy or complex nanoscale patterning,our design introduces asymmetric metal architectures(E-/T-type) to artificially create directional anisotropy.These structures generate plasmon-enhanced localized electric fields that selectively amplify photogenerated carrier momentum under polarized UV light(325 nm),synergized with Fowler-Nordheim tunneling(FNT) across an atomically thin Al_(2)O_(3) barrier.The result is a breakthrough in performance:a record anisotropy ratio of 115.5(E-type,-2 V) and exceptional responsivity(97.7 A/W),surpassing existing graphene-based detectors by over an order of magnitude.Crucially,by systematically modulating metal geometry and density,we demonstrate a universal platform adaptable to diverse 2D/3D systems.This study provides a valuable reference for developing and practically applying photodetectors with higher anisotropy than ultraviolet polarization sensitivity.展开更多
基金National Natural Science Foundation of China(62375090, 62374062, 52002135)Natural Science Foundation of Guangdong Province of China(2023B1515120071)+2 种基金Science and Technology Program of Guangdong Province of China (2023A0505050131,2022A0505050066, 2024A1515011081)Characteristic Innovation Project of Universities in Guangdong Province(2023KTSCX028)Science and Technology Program of Guangzhou,China (2024A04J6456)
文摘This study pioneers a high-performance UV polarization-sensitive photodetector by ingeniously integrating noncentrosymmetric metal nanostructures into a graphene(Gr)/Al_(2)O_(3)/GaN heterojunction.Unlike conventional approaches constrained by graphene's intrinsic isotropy or complex nanoscale patterning,our design introduces asymmetric metal architectures(E-/T-type) to artificially create directional anisotropy.These structures generate plasmon-enhanced localized electric fields that selectively amplify photogenerated carrier momentum under polarized UV light(325 nm),synergized with Fowler-Nordheim tunneling(FNT) across an atomically thin Al_(2)O_(3) barrier.The result is a breakthrough in performance:a record anisotropy ratio of 115.5(E-type,-2 V) and exceptional responsivity(97.7 A/W),surpassing existing graphene-based detectors by over an order of magnitude.Crucially,by systematically modulating metal geometry and density,we demonstrate a universal platform adaptable to diverse 2D/3D systems.This study provides a valuable reference for developing and practically applying photodetectors with higher anisotropy than ultraviolet polarization sensitivity.
