研究目的
To develop a cost-effective, facile fabrication technique compatible with existing silicon process technology for efficient broadband (UV to NIR) photodetectors using carbon nanostructures derived from organic waste.
研究成果
The study successfully developed a facile and cost-effective approach to design an organic–inorganic hybrid material platform compatible with existing Si-technology for broadband photodetectors. The integration of CQDs, rGO, and AgNPs on p-Si minimized the dark current and greatly improved the photodetector responsivity from UV to NIR. The highest responsivity and detectivity achieved were 1 A W?1 and 2 × 1012 Jones for UV, 0.2 A W?1 and 2 × 1011 Jones for visible, and 0.3 A W?1 and 4.1 × 1011 Jones for NIR exposure.
研究不足
The study mentions that with further optimization and defect engineering, faster switching can be achieved, indicating current limitations in response time and recovery time.
1：Experimental Design and Method Selection:
The study involves the synthesis of carbon quantum dots (CQDs) from organic waste and their integration with reduced graphene oxide (rGO) and silver nanoparticles (AgNPs) to form a hybrid heterostructure with Si for broadband photodetection.
2：Sample Selection and Data Sources:
p-Si(111) substrates were used, cleaned through the RCA process, and coated with CQDs, rGO-CQD composite, and rGO-CQD-AgNP composite via spray coating.
3：List of Experimental Equipment and Materials:
Equipment includes a spray gun, thermal evaporation method for electrode formation, TEM, UV-vis-NIR spectrophotometer, XPS, XRD, Raman spectrometer, and Keithley 6487 Source-Measurement Unit. Materials include Carica Papaya pulp for CQD synthesis, AgNO3 for AgNP synthesis, and GO for rGO formation.
4：Experimental Procedures and Operational Workflow:
The process involves synthesis of CQDs and AgNPs, fabrication of devices on p-Si substrates by spray coating, and characterization of the devices' photoresponse under UV, visible, and NIR illumination.
5：Data Analysis Methods:
The photoresponse was analyzed in terms of responsivity, detectivity, and on-off ratio under varying light intensities and wavelengths.
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