Structure with light absorption-enhanced two-dimensional transition metal sulfide
A transition metal and sulfide technology, applied in nanotechnology, electrical components, nanotechnology, etc. for materials and surface science, can solve the problems of limited application, low absorption of two-dimensional transition metal sulfides, and achieve reabsorption Effect
Active Publication Date: 2017-10-20
JIANGNAN UNIV
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Problems solved by technology
However, due to their ultrathin material properties, 2D transition metal dichalcogenides have low light absorption, which limits their applications in high-performance optoelectronic devices such as solar energy conversion devices and photodetectors.
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[0018] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.
[0019] Monolayer molybdenum disulfide, as one of the two-dimensional transition metal sulfides, has excellent electrical and optical properties, and has a wide range of applications in optoelectronic devices. Meanwhile, molybdenum disulfide has the typical characteristics of most two-dimensional transition metal sulfides. The present invention is therefore presented using this structure to enhance the absorption of visible light by monolayer molybdenum disulfide.
[0020] Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that all the drawings are in a very simplified form and use inaccurate scales, and are only used to facilitate and clearly assist the purpose of illu...
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The present invention discloses a structure with a light absorption-enhanced two-dimensional transition metal sulfide. The structure mainly comprises a substrate, a distributed Bragg reflector (DBR), the two-dimensional transition metal sulfide and a precious metal nano grating; the DBR is composed of two different dielectric layers of different refractive indexes; the refractive indexes and thicknesses of the dielectric layers can be adjusted, so that the absorption of light of a specified band by the two-dimensional transition metal sulfide can be enhanced; and the periodic metal nano grating is prepared on the surface of the two-dimensional transition metal sulfide, and therefore, the metal nano grating, on the one hand, can diffuse light which is not absorbed by the two-dimensional material and is reflected by the DBR, and on the other hand, forms local surface plasmon resonance with incident light so as to realize near-field enhancement. According to the structure of the invention, the light absorption of the two-dimensional transition metal sulfide is significantly enhanced.
Description
Technical field: [0001] The invention belongs to the field of optoelectronic technology and relates to a structure for enhancing light absorption of two-dimensional transition metal sulfides. Background technique: [0002] The chemical formula of a two-dimensional transition metal sulfide is MX 2 , M refers to transition metal elements (for example: molybdenum, tungsten, niobium, rhenium, titanium), X refers to chalcogen elements (for example: sulfur, selenium, tellurium). Generally, single-layer transition metal sulfides exhibit an X-M-X sandwich structure, in which the van der Waals forces between layers are weak, but there are strong covalent bonds in the plane. Therefore, bulk transition metal dichalcogenides can be exfoliated into monolayer or multilayer nanosheets for various devices. [0003] In recent years, two-dimensional transition metal dichalcogenides have attracted the attention of many scientists due to their unique electrical and optical properties. When 2...
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Login to View More IPC IPC(8): H01L31/0232H01L31/032B82Y30/00
CPCB82Y30/00H01L31/02327H01L31/032
Inventor 杨国锋曹金涛汪金孙锐陆亚男钱维莹陈国庆
Owner JIANGNAN UNIV