研究目的
To demonstrate significantly enhanced photoresponse of UV photodetectors by the incorporation of various plasmonic NPs in the detector architecture.
研究成果
The photoresponse of UV photodetectors was studied with the mono- and bimetallic NPs of the different size and elemental compositions on GaN (0001) based on the solid-state dewetting approach. The dynamic and improved photoresponse of UV photodetectors has been demonstrated with various monometallic Ag and Au and bimetallic AgAu alloy NPs. Specifically, the AgAu alloy NPs with the higher Ag percentage exhibited the highest responsivity of 112 A W?1, detectivity of 2.4 × 1012 jones, and EQE of 3.6 × 10 4% under 0.03 mW mm?2 at 0.1 V, which is a superior result as compared to the previously reported GaN-based UV photodetectors.
研究不足
The study focuses on the enhancement of UV photodetectors by the incorporation of plasmonic NPs, but the detailed study on the application of plasmonic AgAu alloy NPs in the UV photodetectors has not been attempted up to now.
1：Experimental Design and Method Selection:
The study involves the fabrication of various size and elemental composition of monometallic Ag and Au NPs, as well as bimetallic alloy AgAu NPs, on GaN (0001) by the solid-state dewetting approach. The photoresponse of various NPs are tailored based on the geometric and elemental evolution of NPs.
2：Sample Selection and Data Sources:
The samples are epitaxially grown c-plane GaN (0001) template on sapphire. Various thickness of Ag, Au monolayer, and Ag/Au bilayer films were deposited on the clean GaN (0001) substrate.
3：List of Experimental Equipment and Materials:
The deposition of metallic films was performed in a sputtering chamber. The surface morphology of as-fabricated NPs was studied by a non-contact mode atomic force microscope (NC-AFM) and scanning electron microscope (SEM). For the elemental characterizations of samples, energy-dispersive X-ray spectroscopes (EDS) were utilized. Optical characterization was performed by using a NOST system, equipped with an ANDOR sr-500i spectrograph, CCD detector and combined deuterium-halogen light source.
4：Experimental Procedures and Operational Workflow:
The fabrication of NPs involves annealing the Ag and AgAu bilayer films at 500 °C while the Au films were annealed at 650 oC. For the fabrication of UV photodetectors, the Au electrodes were deposited on each NP sample and bare GaN as a reference.
5：Data Analysis Methods:
The performance of the UV photodetectors was examined under different biasing between 0 and 1 V, and the photocurrent measurement of various devices was taken by using the B2902A precision source/measure unit.
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