Application Of Surface Plasmon Exciton Effect In Carbon Dot-based Solar Blind UV Detector

Since the discovery of the solar blind ultraviolet band in the 1950 s,the development of ultraviolet detection technology has been very rapid,and it has been widely used in various aspects of military and civilian use.In recent years,the advantages of wide band gap semiconductor materials in the field of ultraviolet detection have gradually become more prominent.At present,a new type of carbon dot material is being researched.In order to enhance its photoresponse characteristics in the solar blind ultraviolet band,this subject aims to enhance the photoresponse capability of carbon dots through the surface plasmon effect to improve the performance of devices.The research in this area is of great research and reference significance for the search of solar blind UV detectors with excellent performanceThis thesis first studies the relationship between surface plasmon resonance peaks and various features of metal nanostructures from a simulation perspective.The simulation results show that aluminum shows better surface plasmon resonance effect in the solar blind UV band than gold and silver nanoparticles;the optimal particle radius of aluminum should be maintained at 15 ? 20 nm,at which time the larger the particle density,The stronger the absorption of the solar blind ultraviolet band,the random distribution of particles will not cause significant impact.In the second part of the paper,the surface plasmon effect of aluminum nanoparticles is studied experimentally.According to the experimental results,it is concluded that aluminum nanoparticles prepared by annealing an aluminum film with a thickness of 20 to 25 nm at 400 ? and a standard atmospheric pressure for 1 hour have a comparative Regular particle size and morphology,and has obvious absorption characteristics in the solar blind ultraviolet band.Finally,the thesis studies the performance improvement of applying aluminum nanoparticles to carbon spot solar blind UV detectors.The results show that the enhancement effect of aluminum nanoparticles on the device is not a linear superposition of photocurrent,but the surface plasmon effect enhances the photoresponse of carbon dots.By comparing several groups of devices with aluminum nanoparticles and without aluminum nanoparticles,the comparison results show that the average switching ratio is increased from 32.65 to 79.95;the average response is increased from 0.214 A / W to 0.401 A / W;the average external quantum efficiency is 1.04 Raised to 1.96;the average value of equivalent noise power was reduced from 15.2?W to 4.68?W,proving that aluminum nanoparticles can successfully excite the local surface plasmon effect and have obvious optimization effects on various performances of the device.