Research paperExperimental GrowthExperimental CharacterizationRecord negative photoconductivity in N-polar AlGaN/GaN quantum-well heterostructuresMaciej Matys, Atsushi Yamada, Toshihiro Ohki, Kouji TsunodaarXiv·2025·10.1002/adpr.202500130·arXiv:2504.15536AbstractThe AlGaN/GaN quantum-well heterostructures typically exhibit a positive photoconductivity (PPC) during light illumination. Introducing a GaN/AlN superlattice back barrier into N-polar AlGaN/GaN quantum-well heterostructures induces a transition from PPC to negative photoconductivity (NPC) as the superlattice period number increases at room temperature. The NPC effect is explained by excitation of hot electrons from the two-dimensional electron gas and subsequent trapping in the superlattice structure. The NPC effect exhibits photoconductivity yield exceeding 85% and remains stable up to 400 K.Read more
N-polar AlGaN/GaN quantum-well heterostructure with GaN/AlN superlattice back barrier; superlattice period number varied from 0 to 8.1 preparation4 characterizations5 properties3 figuresExperimentalAlGaN/GaNStudied MaterialGaNStudied MaterialAlNStudied MaterialAlxGa₁-xNStudied MaterialExpand
Reference heterostructure without superlattice back barrier (n=0).1 preparation4 characterizations3 figuresExperimentalAlGaN/GaNStudied MaterialGaNStudied MaterialAlNStudied MaterialAlxGa₁-xNStudied MaterialExpand
Heterostructure with 4-period GaN/AlN superlattice back barrier and 1 µm GaN buffer layer, used for SIMS depth profiling.1 preparation1 characterization3 properties1 figureExperimentalAlGaN/GaNStudied MaterialGaNStudied MaterialAlNStudied MaterialAlxGa₁-xNStudied MaterialExpand
Heterostructure with 4-period GaN/AlN superlattice back barrier and 400 nm GaN buffer layer, used for SIMS comparison.1 preparation1 characterization1 property1 figureExperimentalAlGaN/GaNStudied MaterialGaNStudied MaterialAlNStudied MaterialAlxGa₁-xNStudied MaterialExpand
Research paperExperimental GrowthExperimental CharacterizationRecord negative photoconductivity in N-polar AlGaN/GaN quantum-well heterostructuresMaciej Matys, Atsushi Yamada, Toshihiro Ohki, Kouji TsunodaarXiv·2025·10.1002/adpr.202500130·arXiv:2504.15536AbstractThe AlGaN/GaN quantum-well heterostructures typically exhibit a positive photoconductivity (PPC) during light illumination. Introducing a GaN/AlN superlattice back barrier into N-polar AlGaN/GaN quantum-well heterostructures induces a transition from PPC to negative photoconductivity (NPC) as the superlattice period number increases at room temperature. The NPC effect is explained by excitation of hot electrons from the two-dimensional electron gas and subsequent trapping in the superlattice structure. The NPC effect exhibits photoconductivity yield exceeding 85% and remains stable up to 400 K.Read more
N-polar AlGaN/GaN quantum-well heterostructure with GaN/AlN superlattice back barrier; superlattice period number varied from 0 to 8.1 preparation4 characterizations5 properties3 figuresExperimentalAlGaN/GaNStudied MaterialGaNStudied MaterialAlNStudied MaterialAlxGa₁-xNStudied MaterialExpand
Reference heterostructure without superlattice back barrier (n=0).1 preparation4 characterizations3 figuresExperimentalAlGaN/GaNStudied MaterialGaNStudied MaterialAlNStudied MaterialAlxGa₁-xNStudied MaterialExpand
Heterostructure with 4-period GaN/AlN superlattice back barrier and 1 µm GaN buffer layer, used for SIMS depth profiling.1 preparation1 characterization3 properties1 figureExperimentalAlGaN/GaNStudied MaterialGaNStudied MaterialAlNStudied MaterialAlxGa₁-xNStudied MaterialExpand
Heterostructure with 4-period GaN/AlN superlattice back barrier and 400 nm GaN buffer layer, used for SIMS comparison.1 preparation1 characterization1 property1 figureExperimentalAlGaN/GaNStudied MaterialGaNStudied MaterialAlNStudied MaterialAlxGa₁-xNStudied MaterialExpand
Research paperExperimental GrowthExperimental CharacterizationRecord negative photoconductivity in N-polar AlGaN/GaN quantum-well heterostructuresMaciej Matys, Atsushi Yamada, Toshihiro Ohki, Kouji TsunodaarXiv·2025·10.1002/adpr.202500130·arXiv:2504.15536AbstractThe AlGaN/GaN quantum-well heterostructures typically exhibit a positive photoconductivity (PPC) during light illumination. Introducing a GaN/AlN superlattice back barrier into N-polar AlGaN/GaN quantum-well heterostructures induces a transition from PPC to negative photoconductivity (NPC) as the superlattice period number increases at room temperature. The NPC effect is explained by excitation of hot electrons from the two-dimensional electron gas and subsequent trapping in the superlattice structure. The NPC effect exhibits photoconductivity yield exceeding 85% and remains stable up to 400 K.Read more
N-polar AlGaN/GaN quantum-well heterostructure with GaN/AlN superlattice back barrier; superlattice period number varied from 0 to 8.1 preparation4 characterizations5 properties3 figuresExperimentalAlGaN/GaNStudied MaterialGaNStudied MaterialAlNStudied MaterialAlxGa₁-xNStudied MaterialExpand
Reference heterostructure without superlattice back barrier (n=0).1 preparation4 characterizations3 figuresExperimentalAlGaN/GaNStudied MaterialGaNStudied MaterialAlNStudied MaterialAlxGa₁-xNStudied MaterialExpand
Heterostructure with 4-period GaN/AlN superlattice back barrier and 1 µm GaN buffer layer, used for SIMS depth profiling.1 preparation1 characterization3 properties1 figureExperimentalAlGaN/GaNStudied MaterialGaNStudied MaterialAlNStudied MaterialAlxGa₁-xNStudied MaterialExpand
Heterostructure with 4-period GaN/AlN superlattice back barrier and 400 nm GaN buffer layer, used for SIMS comparison.1 preparation1 characterization1 property1 figureExperimentalAlGaN/GaNStudied MaterialGaNStudied MaterialAlNStudied MaterialAlxGa₁-xNStudied MaterialExpand
Research paperExperimental GrowthExperimental CharacterizationRecord negative photoconductivity in N-polar AlGaN/GaN quantum-well heterostructuresMaciej Matys, Atsushi Yamada, Toshihiro Ohki, Kouji TsunodaarXiv·2025·10.1002/adpr.202500130·arXiv:2504.15536AbstractThe AlGaN/GaN quantum-well heterostructures typically exhibit a positive photoconductivity (PPC) during light illumination. Introducing a GaN/AlN superlattice back barrier into N-polar AlGaN/GaN quantum-well heterostructures induces a transition from PPC to negative photoconductivity (NPC) as the superlattice period number increases at room temperature. The NPC effect is explained by excitation of hot electrons from the two-dimensional electron gas and subsequent trapping in the superlattice structure. The NPC effect exhibits photoconductivity yield exceeding 85% and remains stable up to 400 K.Read more
N-polar AlGaN/GaN quantum-well heterostructure with GaN/AlN superlattice back barrier; superlattice period number varied from 0 to 8.1 preparation4 characterizations5 properties3 figuresExperimentalAlGaN/GaNStudied MaterialGaNStudied MaterialAlNStudied MaterialAlxGa₁-xNStudied MaterialExpand
Reference heterostructure without superlattice back barrier (n=0).1 preparation4 characterizations3 figuresExperimentalAlGaN/GaNStudied MaterialGaNStudied MaterialAlNStudied MaterialAlxGa₁-xNStudied MaterialExpand
Heterostructure with 4-period GaN/AlN superlattice back barrier and 1 µm GaN buffer layer, used for SIMS depth profiling.1 preparation1 characterization3 properties1 figureExperimentalAlGaN/GaNStudied MaterialGaNStudied MaterialAlNStudied MaterialAlxGa₁-xNStudied MaterialExpand
Heterostructure with 4-period GaN/AlN superlattice back barrier and 400 nm GaN buffer layer, used for SIMS comparison.1 preparation1 characterization1 property1 figureExperimentalAlGaN/GaNStudied MaterialGaNStudied MaterialAlNStudied MaterialAlxGa₁-xNStudied MaterialExpand