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In the latest issue of Applied Physics Letters, “Self-powered and broadband photodetectors based on graphene/ In the article “ZnO/silicon triple junctionsâ€, the device has a broad spectrum detection range of 1,000 nm to 400 nm, covering the visible spectrum to infrared. News-self-powered-photodetector According to the researchers, this component uses a thin layer of graphene as a transparent electrode on the top layer and acts as an effective collection layer for light-generating carriers. A thin layer of zinc oxide (ZnO) between graphene and silicon functions as an anti-reflection layer for capturing incident light and increasing light absorption.
The built-in electric field at the interfaces of graphene/zinc oxide and zinc oxide/silicon enhances the charge isolation between photo-generated electrons and hole pairs, making the sensitivity and response time of the module comparable to that of graphene/silicon. Mass interface components are much improved.
By choosing the right frequency band calibration and the uniqueness of different materials, researchers were able to design components with high sensitivity and fast response time - from near ultraviolet (UV) to infrared wavelength range. The boot response time for implementing the prototype is approximately 280μs, but the Taiwanese team expects this number to fall below 100μs.
Because this self-powered photodetector has a simple architecture that is compatible with silicon manufacturing processes, researchers hope it will also find many new applications in ultra-low power applications, including next-generation optoelectronic components.
(Original title: Graphene-based photodetectors are self-powered)
A blended powder of tungsten carbide and Metal Alloy Powder can be used for laser cladding, a process used to deposit a layer of material onto a substrate using a laser beam. This blended powder is typically used as a feedstock material for laser cladding applications where high wear resistance and hardness are required.
Tungsten carbide is a hard and wear-resistant material that is commonly used in cutting tools, mining equipment, and other high-wear applications. It has excellent thermal conductivity and high melting point, making it suitable for laser cladding processes.
Metal alloy powders, on the other hand, are often added to the Tungsten Carbide Powder to enhance certain properties or tailor the characteristics of the final cladding layer. These metal alloys can include nickel, cobalt, chromium, or other elements, depending on the specific requirements of the application.
The blended powder is typically prepared by mixing the tungsten carbide and metal alloy powders in the desired ratio. This mixture is then fed into a laser cladding system, where it is melted using a high-power laser beam. The molten powder is rapidly solidified onto the substrate, forming a dense and wear-resistant cladding layer.
The resulting cladding layer can have excellent hardness, wear resistance, and thermal conductivity, making it suitable for various applications such as tooling, wear parts, and surface protection. The specific properties of the cladding layer can be adjusted by varying the composition and ratio of the tungsten carbide and metal alloy powders in the blend.
Overall, the blended powder of tungsten carbide and metal alloy powder offers a versatile and customizable solution for laser cladding applications, providing enhanced wear resistance, hardness, and other desired properties to the final cladding layer.
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