Study On Negative Red Conductance Effect Of WO₃ Nanowires

In recent years,researchers'research work on low-dimensional semiconductor materials has been heating up.The unique and superior structural characteristics of low-dimensional semiconductor materials have provided important material foundations for studying electrical properties.With the continuous deepening of the research,the negative photoconductivity effect of low-dimensional semiconductor material systems has attracted widespread attention.Hexagonal tungsten trioxide is due to its superior and unique structural characteristics,high environmental stability,special electronic band structure,Excellent optical?electrical,thermal?discoloration characteristics and high resistance switching capabilities have become one of the popular materials in low-dimensional semiconductor materials.This paper mainly studies the preparation of hexagonal tungsten trioxide nanowires,the construction of devices,and the negative photoconductivity of materials induced by red light and the mechanism of negative photoconductivity.The main research results of this paper are divided into the following aspects:1.Preparation and characterization of hexagonal tungsten trioxide nanowires.We prepared the hexagonal tungsten trioxide nanowires by hydrothermal method.Through the SEM,EDS energy spectroscopy,X-ray diffractometer,Raman spectrometer and other characterization methods,we have confirmed that we have prepared WO₃ nanowires with good crystallinity,high lattice quality,uniform length and thickness,and smooth surface without impurities.2.Construction of hexagonal tungsten trioxide nanowire devices.Using deep ultraviolet photolithography,coating,and lift-off technologies to build a WO₃ nanowire dual-end device Au/h-WO₃ nanowire/Au.The channel width of the device was adjusted by electron beam exposure technology,and a narrow channel WO₃ nanowire device was constructed.Based on this,we systematically studied its electrical transport performance based on Au/h-WO₃ nanowire/Au double-ended devices.3.Study on the negative photoconductivity of hexagonal tungsten trioxide nanowires.The device was tested for negative photoconductivity through the 2602 instrument,and the WO₃ nanowire double-ended device was tested by adjusting the red laser intensity,the humidity and temperature of the test environment.We found that the device can also be used under the action of red light It exhibits stable negative photoconductivity.The negative photoconductivity can be adjusted by adjusting external conditions,and the mechanism of negative photoconductivity is explained.