Comparative Study On The Optoelectronic Performance Of Several Nanomaterials With Different Dimensions

After the third industrial revolution,electronic semiconductor technology has developed rapidly.Photodetector with the characteristics of flexibility,portability,low cost,and easy integration has become growing popularity.The progress of these technologies is inseparable from the decisive factor behind it:the preparation of nanomaterials.Semiconductor nanomaterials have a invisible micromorphology compared with semiconductor crystalline materials,which can be divided into Zero-dimensional,one-dimensional,two-dimensional and three-dimensional according to the different microstructure.Each dimension has its unique characteristics that can be applied to different devices.Furthermore,the preparation technology of nanomaterials provides a brand-new path for the application of semiconductor materials in electronic devices.When the crystalline material is nanometerized,some unexpected changes in performance will occur,such as an increase in surface area and electron mobility,and a change in band gap,which will have a crucial impact on the performance of the equipment.For example,since graphene was successfully exfoliated,it was found that the carrier mobility reached 10⁶ m/s,which is 1/300 of the speed of light;the single-layer light absorption rate was 2.3%,and the transmitted light reached 97.7%.These excellent photoelectric properties make it an important application in the fields of batteries,capacitors,photocatalysis,and photoelectric detection.In the past decade,many researchers have been devoted to constructing the microstructure of nanomaterials,and achieved many new breakthroughs on the basis of the original.Composite materials can combine the advantages of both materials and different nanostructures,which is a good idea for the application of nanomaterials.In this dissertation,the photoelectric detection performance of two kinds of nanomaterials,V₂O₅ nanowires and Mo Se₂ nanoflowers,is studied.On the basis,the two materials were composited.Compared with the results before composite,the performance has been improved.The details are as follows:1.Preparation of two nanomaterials,V₂O₅ nanowires and Mo Se₂ nanoflowers,respectively,and their photoelectric detection properties were tested.2.Analyzed the test results to determine the composite material:Graphene is compounded with V₂O₅ nanowire,WSe₂ nanosheet is compounded with Mo Se₂nanoflower.3.Preparation of graphene and WSe₂ nanosheets,preparation of composite structures.4.The results show that the photocurrent of V₂O₅ nanowire and GO composite structure is more than ten times higher than that before composite,but the response time is delayed;the photocurrent and response time of Mo Se₂ nanowire and WSe₂nanocomposite structure are improved.Finally,the results of this paper were summarized.We also analyzed the shortcomings of the experiment in light of the actual situation,and proposed measures for improvement,hoping to be helpful for future research.