A Composite Structure with Enhanced Broadband Light Absorption Efficiency

Abstract

The invention discloses a compound structure with a function of improving the wide-spectrum light absorption efficiency. The compound structure comprises absorbing layers and reflecting layers which are compounded with one another. The absorbing layers are of photonic crystal structures, and periodic triangular grooves in the surfaces of nonmetal materials are filled with thin polymer films or thin films with colloidal quantum dots to form the photonic crystal structures; metal materials are coated on the surfaces of random triangular grooves in the bottom surfaces of the nonmetal materials to form the reflecting layers. The compound structure has the advantages that efficient absorption of broadband and wide-angle solar energy in wavebands which cover the ranges from ultraviolet waves to infrared waves can be improved by the aid of the compound structure, the infrared wavebands exceed Yablonovitch limit, electric fields in the triangular grooves in the surfaces of the absorbing layers and in cavities formed by the reflecting layers and the triangular grooves in the surfaces of the absorbing layers can be greatly strengthened, and the compound structure has an excellent application prospect in the aspects of solar cells, photoelectric detection, military stealth and the like.

Description

technical field [0001] The invention relates to a compound structure composed of an absorbing layer and a reflective layer, in particular to a compound structure containing a photon crystal structure and a random metal triangular groove reflective structure to improve wide-spectrum light absorption efficiency. Background technique [0002] Achieving efficient broadband electromagnetic wave absorption is very important in the fields of solar cells, photoelectric detection, and military stealth. [0003] In 1982, Yablonovitch proposed the light absorption limit in homogeneous semiconductor thin films. However, the Yablonovitch limit is only applicable to geometric optics, but in micro-nano structures, diffraction, reflection and refraction work together, and light absorption can exceed the Yablonovitch limit. At present, scientists have proposed many light-coupling structures containing noble metal materials to enhance solar light absorption. These coupling structures are div...

AI Technical Summary

Problems solved by technology

In order to solve the problem that the existing structure only achieves light absorption enhancement in a narrow band and is lower than the Yablonovitch limit

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