Emerging two-dimensional(2D)materials offer significant potential for post-silicon photodetectors but often fall short of matching silicon photodiode performance.Here,we report a flexible,highperformance photodetector...Emerging two-dimensional(2D)materials offer significant potential for post-silicon photodetectors but often fall short of matching silicon photodiode performance.Here,we report a flexible,highperformance photodetector with a simple metal-2D semiconductor-metal structure by stacking Ti/WSe2/Ag layers on a mica substrate.The device demonstrates a low dark current of 0.8 pA,high external quantum efficiency of 49%,a broad linear dynamic range of 86 dB,wide spectral sensitivity(350-1200 nm),and ultrafast response speed(~1μs rise/fall time by conventional measurement and 337 ps via ultrafast photocurrent method).These advances originate from efficient photocarrier extraction via an ultrashort channel and Schottky barriers facilitated by van der Waals contacts.Additionally,the device’s ultrathin(~200 nm)profile ensures exceptional bending durability,while encapsulation protects against ambient degradation.Our strategy here will promote the development of the post-silicon photodetector and foster next-generation flexible optoelectronic applications.展开更多
Structural colors with high saturation,large gamut,high resolution,and tunable color are expected in practical applications.This work explores the generation of tunable structural color based on transmission metasurfa...Structural colors with high saturation,large gamut,high resolution,and tunable color are expected in practical applications.This work explores the generation of tunable structural color based on transmission metasurfaces.The designed metasurfaces consist of rectangular nanoholes etched in silver film,which is deposited on the stretchable polydimethylsiloxane(PDMS)substrate.The smaller separation of adjacent nanoholes makes the resolution of metasurface reach 63,500 dpi.The color gamut of the nanostructures reaches 146.9%sRGB.We also perform a comparison with the case on the glass substrate and analyze the incident polarization condition and the coating film of polymethyl methacrylate(PMMA).The ultra-thin structure,high resolution,highperformance structural colors,and convenient transmission mode provide broad application prospects for metasurfaces in color displaying,color printing,and color holographic imaging.展开更多
基金supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(RS-2024-00356964 and RS-2024-00406152).
文摘Emerging two-dimensional(2D)materials offer significant potential for post-silicon photodetectors but often fall short of matching silicon photodiode performance.Here,we report a flexible,highperformance photodetector with a simple metal-2D semiconductor-metal structure by stacking Ti/WSe2/Ag layers on a mica substrate.The device demonstrates a low dark current of 0.8 pA,high external quantum efficiency of 49%,a broad linear dynamic range of 86 dB,wide spectral sensitivity(350-1200 nm),and ultrafast response speed(~1μs rise/fall time by conventional measurement and 337 ps via ultrafast photocurrent method).These advances originate from efficient photocarrier extraction via an ultrashort channel and Schottky barriers facilitated by van der Waals contacts.Additionally,the device’s ultrathin(~200 nm)profile ensures exceptional bending durability,while encapsulation protects against ambient degradation.Our strategy here will promote the development of the post-silicon photodetector and foster next-generation flexible optoelectronic applications.
基金National Natural Science Foundation of China(10874105)Natural Science Foundation of Shandong Province(ZR2020KA009)。
文摘Structural colors with high saturation,large gamut,high resolution,and tunable color are expected in practical applications.This work explores the generation of tunable structural color based on transmission metasurfaces.The designed metasurfaces consist of rectangular nanoholes etched in silver film,which is deposited on the stretchable polydimethylsiloxane(PDMS)substrate.The smaller separation of adjacent nanoholes makes the resolution of metasurface reach 63,500 dpi.The color gamut of the nanostructures reaches 146.9%sRGB.We also perform a comparison with the case on the glass substrate and analyze the incident polarization condition and the coating film of polymethyl methacrylate(PMMA).The ultra-thin structure,high resolution,highperformance structural colors,and convenient transmission mode provide broad application prospects for metasurfaces in color displaying,color printing,and color holographic imaging.
