Construction And Electrical Properties Of C₆₀(C₇₀) Molecule/copper Selenide Two-dimensional Heterostructures

As the most popular two-dimensional atomic crystal material in recent years,graphene has a special atomic and electronic energy band structure,has many novel physical and chemical properties,and has been a research hotspot in many fields such as condensed matter physics,chemical catalysis,and energy.With the development of graphene,other single-element two-dimensional atomic crystal materials with graphene-like structure have gradually become the hotspot of international frontier research in recent years.For example,silene,germanium and other porous non-carbon materials similar to graphene Dimensional atomic crystal materials,or other warped structures similar to phosphorene,the novel physical properties of these graphene-like two-dimensional atomic crystals are similar to graphene,which can bring some new functions and applications,and also have graphene The lack of some characteristics can make up for the lack of graphene energy gap,for example.In this paper,two-dimensional atomic crystals and fullerene crystals,which are popular in research,are organically combined.The large-area,periodic pore structure of CuSe is used as a template to combine with"zero-dimensional molecules"-fullerene molecules(C₆₀,C₇₀)To form a heterojunction structure,and characterize the C₆₀/CuSe heterojunction structure and C₇₀/CuSe heterojunction structure using an ultra-high vacuum scanning tunneling microscope,and analyze its physical and electrical properties.This article introduces the discovery history,research status and excellent chemical and physical properties of two-dimensional atomic crystal materials,as well as the origin,development and research status of fullerene molecules.The research focuses on studying the physical and electrical properties of the two molecules.At the same time introduces the development history,working principle and background knowledge of scanning tunneling electron microscope,and introduces two instruments used in this experiment:ultra-high vacuum-molecular beam epitaxy-low temperature scanning probe microscope system(LT-STM)and ultra-high vacuum-molecular beam epitaxy technology-variable temperature scanning probe microscope system(Fermi-STM).In this paper introduces the adsorption structure and electrical properties of C₆₀molecule in CuSe.C₆₀ molecules can be deposited in the pores of CuSe,and there is no change to the lattice of CuSe itself,C₆₀ molecules will grow C₆₀ molecular islands in the second layer after the first layer is fully deposited.According to the STS spectrum,the peak value and the position of the peak value of the electronic state of C₆₀ deposited in the pore have been changed.At the same time,introduces the adsorption structure and electrical properties of C₇₀ on CuSe surface.It is found that C₇₀ molecules can also be deposited in CuSe holes,as the same as C₆₀ molecules,the original CuSe lattice does not change.From the STS spectrum,it can be seen that the electronic state of C₇₀molecules in the hole is also different from that of the surface C₇₀ molecules,there will be a small part of enhancement,and the position of the peak is also shifted by a small amount.Different from the C₆₀ molecule,the new C₇₀ island will be formed directly on the C₇₀ island after the C₇₀ molecule is deposited.