Three-layer antireflective film for solar battery and preparation method thereof

Abstract

The invention discloses a three-layer antireflective film for a solar battery and a preparation method thereof, which are suitable for an III-V family compound solar battery, in particular a GaInP / GaInAs / Ge multijunction solar battery. Antireflective films are orderly laminated on the GaInP / GaInAs / Ge multijunction solar battery to form a compound optical film; and in three layers of antireflectivefilms, the first layer is a AlGaInP film with the refractive index between 3.15 and 3.45, the second layer is a Ta2O5 film with the refractive index between 2.12 and 2.18, and the third layer is a MgF2 film with the refractive index approximately between 1.37 and 1.39. The three layers of the antireflective films have small absorption in an application wave band range, good optical and chemical stability, good combination and firmness with a base material of the battery, matched refractive indexes, and simple preparation process at the same time; and the mean transmittance of a solar spectrumwith a wave band between 40 and 1,200 nm on the surface of the battery is over 98 percent.

Description

technical field [0001] The invention relates to an anti-reflection film applicable to III-V compound solar cells, in particular to a three-layer solar cell anti-reflection film which can be widely applied to GaInP / GaInAs / Ge multi-junction solar cells and a preparation method thereof. Background technique [0002] A solar cell is an optoelectronic device that converts light energy into electrical energy. Its photoelectric conversion efficiency is defined as the ratio of the total output power to the total power of sunlight incident on the surface of the solar cell. In the physical process related to the loss of light conversion efficiency, reflection loss Especially important, it reduces the number of incident photons per unit area of ​​the solar cell, resulting in a decrease in the current density of the solar cell, thereby affecting the energy conversion efficiency of the cell. In order to improve the photoelectric conversion efficiency of the battery, the reflection loss o...

AI Technical Summary

Problems solved by technology

The single-layer anti-reflection coating is the simplest film system, but the anti-reflection ability of the single-layer film is limited by the material itself and cannot reach a high level. At the same time, it only has a good anti-reflection and anti-reflection effect for a single wavelength. Solar cells need to eliminate residual reflection in a wide range (about 400-1200nm band), which requires the preparation of multi-layer broadband anti-reflection coating system

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