Light absorption composite structure and application thereof

Abstract

The invention belongs to the field of solar cell surface reflection reducing systems, and discloses a light absorption composite structure. The composite structure comprises a silicon substrate and a plurality of optical grating nano pillar structures arranged on the silicon substrate, wherein the optical grating nano pillar structures are distributed in rows, and each optical grating nano pillar structure comprises a two-dimensional optical grating and a nano pillar, in which the two-dimensional optical gratings are in cuboid shapes, and the nano pillars are cylindrical respectively; center lines of the nano pillars pass through central points of the two-dimensional optical gratings; the bottom surfaces of the two-dimensional optical gratings are in contact with the top surface of the silicon substrate, and the bottom surface of the two-dimensional optical gratings and the top surface of the silicon substrate are fixedly connected together; the top surfaces of the two-dimensional optical gratings are in contact with the bottom surfaces of the nano pillars, and the top surfaces of the two-dimensional optical gratings and the bottom surfaces of the nano pillars are fixedly connected together. The composite structure consists of the two structures, namely the two-dimensional optical gratings and the nano pillars, and various effects can be generated, so that the absorbing performance of the composite structure for sunlight is improved.

Description

technical field [0001] The invention belongs to the field of solar cell surface antireflection systems, and more specifically relates to a light-absorbing composite structure and its application. Background technique [0002] A solar cell is a device that can directly convert solar energy into electrical energy. With the emergence of energy and environmental issues, photovoltaic power generation technology is becoming more and more widely used. The application of solar cells can be traced back to the 1950s. The materials, structures and processes of solar cells will affect the absorption of light energy and the conversion to electrical energy. After more than half a century of development, there are many types of solar cells , and its absorption rate and conversion rate have also been greatly improved. The improvement of conversion rate is the key technology of solar cells, which can improve the light absorption rate and photoelectric conversion rate of solar cells from the...

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a light-absorbing composite structure and its application, which can effectively solve the problem of low light absorption rate of silicon solar cells, and improve the density of electrons and holes inside the solar cell. Migration rate, improve photoelectric conversion efficiency, the composite structure can reduce the preparation cost of nanopillars, improve the overall stability of the composite structure; in addition, by adjusting the arrangement and composition of the two-dimensional grating and nanopillar array inside the composite structure, it is possible to regulate the silicon The light absorptivity of the surface of the solar cell reduces the fluctuation of light absorptivity caused by different light bands

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