Two-dimensional （2D） materials, e.g., graphene, transition metal dichalcogenides （TMDs）, and black phosphorus （BP）, have demonstrated fascinating electrical and optical characteristics and exhibited great potent...Two-dimensional （2D） materials, e.g., graphene, transition metal dichalcogenides （TMDs）, and black phosphorus （BP）, have demonstrated fascinating electrical and optical characteristics and exhibited great potential in optoelectronic applications. High-performance and multifunctional devices were achieved by employing diverse designs, such as hybrid systems with nanostructured materials, bulk semiconductors and organics, forming 2D heterostructures. In this review, we mainly discuss the recent progress of 2D materials in high-responsive photodetectors, light-emitting devices and single photon emitters. Hybrid systems and van der Waals heterostructure-based devices are emphasized, which exhibit great potential in state-of-the-art applications.展开更多
The first atmospheric window of 3-5μm in the mid-infrared(MIR)spectral range pertains to crucial application fields,with particular scientific and technological importance.However,conventional narrow-bandgap semicond...The first atmospheric window of 3-5μm in the mid-infrared(MIR)spectral range pertains to crucial application fields,with particular scientific and technological importance.However,conventional narrow-bandgap semiconductors operating at this band,represented by mercury cadmium telluride and indium antimonide,suffer from limited specific detectivity at room temperature and hindered optoelectronic integration.In this study,a plasmonic hot electron-empowered MIR photodetector based on Al-doped ZnO(AZO)/bi-layer graphene heterostructure is demonstrated.Free electrons oscillate coherently in AZO disk arrays,resulting in strong localized surface plasmon resonance(LSPR)in the MIR region.The photoelectric conversion efficiency at 3-5μm is significantly improved due to plasmon-induced hot-electron extraction and LSPR-enhanced light absorption.The specific detectivity reaches about 1.4×10^(11)Jones and responsivity is up to 4712.3 A/W at wavelength of 3μm at room temperature.The device’s specific detectivity is among the highest performance of commercial state-ofthe-art photodetectors and superior to most of the other 2 D materials based photo detectors in the MIR region.These results demonstrate that a plasmonic heavily doped metal oxides/2 D material heterostructure is a suitable architecture for constructing highly sensitive room-temperature MIR photodetectors.展开更多
Two-dimensional surface-enhanced Raman scattering(SERS)substrates have drawn intense attention due to their excellent spectral reproducibility,high uniformity and perfect anti-interference ability.However,the inferior...Two-dimensional surface-enhanced Raman scattering(SERS)substrates have drawn intense attention due to their excellent spectral reproducibility,high uniformity and perfect anti-interference ability.However,the inferior detection sensitivity and low enhancement have limited the practical application of two-dimensional SERS substrates.To address this issue,we propose that the interaction between the MoTe_(2) substrate and the analyte rhodamine 6G molecules could be remarkably enhanced by the introduced p-doping effect and lattice distortion of MoTe_(2) via hydrogen plasma treatment.After the treatment,the SERS is greatly improved,the enhancement factor of probe molecules reaches 1.83×10^(6) as well as the limit of detection concentration reaches 10^(−13) M.This method is anticipated to afford new enhancement probability for other 2D materials,even non-metal oxide semiconductor SERS substrates.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61422503 and 61376104)the Open Research Funds of Key Laboratory of MEMS of Ministry of Education of Chinathe Fundamental Research Funds for the Central Universities of China
文摘Two-dimensional （2D） materials, e.g., graphene, transition metal dichalcogenides （TMDs）, and black phosphorus （BP）, have demonstrated fascinating electrical and optical characteristics and exhibited great potential in optoelectronic applications. High-performance and multifunctional devices were achieved by employing diverse designs, such as hybrid systems with nanostructured materials, bulk semiconductors and organics, forming 2D heterostructures. In this review, we mainly discuss the recent progress of 2D materials in high-responsive photodetectors, light-emitting devices and single photon emitters. Hybrid systems and van der Waals heterostructure-based devices are emphasized, which exhibit great potential in state-of-the-art applications.
基金supported by the National Key Research and Development Program of China(Grant No.2017YFA0205700)the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB30000000)+1 种基金the China Postdoctoral Science Foundation(Grant No.2021M690625)the Jiangsu Planned Projects for Postdoctoral Research Funds(Grant No.2021K106B)。
文摘The first atmospheric window of 3-5μm in the mid-infrared(MIR)spectral range pertains to crucial application fields,with particular scientific and technological importance.However,conventional narrow-bandgap semiconductors operating at this band,represented by mercury cadmium telluride and indium antimonide,suffer from limited specific detectivity at room temperature and hindered optoelectronic integration.In this study,a plasmonic hot electron-empowered MIR photodetector based on Al-doped ZnO(AZO)/bi-layer graphene heterostructure is demonstrated.Free electrons oscillate coherently in AZO disk arrays,resulting in strong localized surface plasmon resonance(LSPR)in the MIR region.The photoelectric conversion efficiency at 3-5μm is significantly improved due to plasmon-induced hot-electron extraction and LSPR-enhanced light absorption.The specific detectivity reaches about 1.4×10^(11)Jones and responsivity is up to 4712.3 A/W at wavelength of 3μm at room temperature.The device’s specific detectivity is among the highest performance of commercial state-ofthe-art photodetectors and superior to most of the other 2 D materials based photo detectors in the MIR region.These results demonstrate that a plasmonic heavily doped metal oxides/2 D material heterostructure is a suitable architecture for constructing highly sensitive room-temperature MIR photodetectors.
基金Supported by the National Natural Science Foundation of China(Grant Nos.91963130,11704068,61927808,and 61705106)the National Key R&D Program of China(Grant No.2019YFA0308000)+1 种基金the Fundamental Research Funds for the Central Universities(Grant Nos.2242021k10009,2242021R20037,and 2242021R20035)the China Postdoctoral Science Foundation(Grant No.2018M632197).
文摘Two-dimensional surface-enhanced Raman scattering(SERS)substrates have drawn intense attention due to their excellent spectral reproducibility,high uniformity and perfect anti-interference ability.However,the inferior detection sensitivity and low enhancement have limited the practical application of two-dimensional SERS substrates.To address this issue,we propose that the interaction between the MoTe_(2) substrate and the analyte rhodamine 6G molecules could be remarkably enhanced by the introduced p-doping effect and lattice distortion of MoTe_(2) via hydrogen plasma treatment.After the treatment,the SERS is greatly improved,the enhancement factor of probe molecules reaches 1.83×10^(6) as well as the limit of detection concentration reaches 10^(−13) M.This method is anticipated to afford new enhancement probability for other 2D materials,even non-metal oxide semiconductor SERS substrates.
