研究目的
To overcome the challenges in synthesizing crystalline diamond nanowires with controllable morphologies and the material’s high carrier concentration with low mobilities that limits the obtainable photoresponsivity, by integrating ultrananocrystalline diamond (UNCD) nanowires with nanoplasmonic enhancement by noble metal nanoparticles to fabricate high-performance ultraviolet photodetectors.
研究成果
The study successfully demonstrated the fabrication of self-powered, visible-blind nanoplasmonic 1D diamond UV photodetectors with ultrahigh performance parameters, including a peak photoresponsivity of 388 AW-1 at 300 nm and a rapid response time of about 20 ms. The device exhibited excellent stability, repeatability, and a high UV/visible rejection ratio, suggesting great potential for applications in large aperture UV photodetectors, imaging arrays, and nanophotonics.
研究不足
The width of UNCD nanowires was limited by the UNCD surface quality and the fabrication technology employed, potentially affecting device performance. Further optimization of metal nanoparticle size, shape, and distribution could enhance UV absorption and carrier transport.
1：Experimental Design and Method Selection:
The study involved the fabrication of boron-doped ultrananocrystalline diamond nanowires functionalized with platinum nanoparticles to form self-powered ultraviolet photodetectors. The methodology included the synthesis of UNCD thin films using a Hot-Filament Chemical Vapor Deposition (HFCVD) technique, fabrication of UNCD nanowire arrays using a top-down technique involving electron beam lithography (EBL) patterning and two-step RIE etching processing, and functionalization with platinum nanoparticles.
2：Sample Selection and Data Sources:
Boron-doped ultrananocrystalline diamond films on Si substrates were synthesized and characterized using scanning electron microscope (SEM), energy dispersive X-ray analyzer (EDX), and atomic force microscope (AFM).
3：List of Experimental Equipment and Materials:
Equipment included SEM (Horiba Company, USA), EDX, AFM, and a plasma sputtering chamber for Pt nanoparticle deposition. Materials included boron-doped UNCD films, platinum wire (
4：98% purity), and argon gas (99% purity). Experimental Procedures and Operational Workflow:
The process involved UNCD synthesis, nanowire fabrication via EBL and RIE, electrode deposition, and Pt nanoparticle functionalization.
5：Data Analysis Methods:
The performance of the photodetectors was characterized under zero bias voltage, with photocurrent and spectral response measurements.
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