二硫化钼中缺陷对光学性能的影响

2004年,英国曼彻斯特大学科学家安德烈盖姆和康斯坦丁诺沃肖洛夫第一次制备了石墨烯,石墨烯的优异性能得到全世界对二维材料的广泛关注,短短几年,二维材料就在光、电、力学等方面研究。继石墨烯之后,不断有新的二维材料被发现并研究,MoS2是常见的二维材料之一,MoS2迅速成为国内外的研究热点。MoS2是具有特殊的物理化学性质和特殊的层状结构的材料。M oS2有优越的光学性能,当MoS2层数逐渐减小到单层时,其能带结构由间接带隙变成了直接带隙,直接带隙使MoS2对光的利用更加彻底,因此其在光学方面具有巨大的应用潜力。随着研究的深入,缺陷也在二维材料中出现,且缺陷对性能影响较大。不同的缺陷对MoS2光致发光有不同的影响。本论文研究的主要内容是MoS2的基本结构和能带结构以及应用,缺陷的种类及缺陷的产生,缺陷对MoS2光致发光的影响。

Effect of Defects in Molybdenum Disulfide on Optical Properties

In 2004,the University of Manchester scientists Andrei Gem and Konstantin Novoselov made graphene for the first time.Due to the excellent properties of graphene,the two-dimensional materials have attracted widespread attention in the world.In the year,two-dimensional materials were studied in the fields of light,electricity and mechanics.After graphene,new two-dimensional materials were constantly being discovered and studied.MoS2 is one of the common two-dimensional materials,and MoS2 has quickly become a research hotspot at home and abroad.MoS2 is a material with special physicochemical properties and a special layered structure.MoS2 has superior optical properties.When the number of MoS2 layers is gradually reduced to a single layer,its energy band structure is changed from an indirect band gap to a direct band gap.The direct band gap makes MoS2 use light more thoroughly.It has huge application potential in optical aspect.With the deepening of research,defects also appear in two-dimensional materials,and defects have a greater impact on performance.Different defects have different effects on the photoluminescence of MoS2.The main content of this thesis is the basic structure,band structure and application of MoS2,the types of defects and the generation of defects,and the effect of defects on the photoluminescence of MoS2.