Wide-spectrum light splitter based on nano structure and producing method and application thereof

Abstract

The invention discloses a wide-spectrum light splitter based on a nano structure and a producing method and application thereof. A photonic crystal is formed on a base material which is transparent for transmitted light, forbidden bands and medium bands of the photonic crystal are designed and are selectively adapted to the incident light in the high-frequency band, the medium-frequency band and the low-frequency band respectively, and thus the wide-spectrum incident light is split into reflected light and transmitted light based on required wave bands. By adjusting the lattice constant of the photonic crystal, frequency domains of the forbidden bands can be set conveniently to improve the light-splitting flexibility of wide-spectrum sunlight in the reflecting frequency band and the transmitting frequency band; besides, by adjusting the periodicity and the etching depth of the photonic crystal, the sharpness degree of the boundary for the reflection and the transmission of the light splitter is improved, the sensitivity of the light-splitting reflectivity to the direction and the polarization is lowered, the light-splitting efficiency of the wide-spectrum light splitter based on the nano structure is largely raised, and thus the overall transformation efficiency of a solar battery system is improved. Furthermore, the invention also has the characteristics of high production efficiency of finished products and low cost.

Description

technical field [0001] The invention relates to a solar energy system device, in particular to a device for performing wide-spectrum and multi-band light splitting on incident light, a manufacturing method and an application thereof, belonging to the field of micro-nano photonics. Background technique [0002] The energy issue is one of the greatest challenges faced by countries all over the world in the 21st century. High-efficiency solar power generation technology, as a forward-looking and strategic new energy technology that supports the national economy and sustainable development, has already become the key support and priority development direction in the long-term scientific and technological development plans of various countries. The main bottleneck restricting the large-scale application of solar cells is to improve efficiency and reduce costs. Based on the dispersion of sunlight in space and spectrum, concentrating multi-junction cell systems have become the mai...

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Problems solved by technology

[0007] The object of the present invention is to propose a wide-spectrum beam splitter based on nanostructures and its preparation method and application, to solve the bottleneck limitation of the prior art on sunlight light splitting efficiency, and the low conversion rate of solar cells dominated by this bottleneck question

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