Method for manufacturing high-refractive-index silicon nitride antireflection film

Abstract

The invention relates to a method for manufacturing a high-refractive-index silicon nitride antireflection film. According to the method, the high-refractive-index silicon nitride antireflection film formed by three silicon nitride antireflection films is obtained by sequentially plating the upper surface, having been subject to cleaning, texturing, diffusion and etching, of a crystalline silicon wafer with one high-refractive-index silicon nitride antireflection film with the refractive index ranging from 2.10 to 2.15, one high-refractive-index silicon nitride antireflection film with the refractive index ranging from 2.25 to 2.30 and another low-refractive-index silicon nitride antireflection film with the refractive index ranging from 2.00 to 2.05, wherein the refractive index of the obtained high-refractive-index silicon nitride antireflection film ranges from 2.12 to 2.16. The high-refractive-index silicon nitride antireflection film manufactured through the method can meet the requirement for PID resistance of a battery assembly; in addition, compared with a traditional process for manufacturing a high-refractive-index antireflection film, the method has the advantages that the conversion rate of the finished product is improved by more than 0.05%, the open-circuit voltage of the finished product is improved by 1mV, and the short-circuit current of the finished product is improved by 30mA or so.

Description

technical field [0001] The invention belongs to the technical field of solar cells, in particular to a method for manufacturing a high-refractive-index silicon nitride anti-reflection film. Background technique [0002] Research in recent years has shown that the high voltage between the circuit in the crystalline silicon photovoltaic module and its grounded metal frame will cause continuous degradation of the photovoltaic performance of the module. There are many mechanisms causing such attenuation. For example, under the action of the above-mentioned high voltage, the ion migration phenomenon that occurs in the packaging material of the component battery and the materials of the upper surface layer and the lower surface layer of the component; sub-phenomena; charge redistribution cuts down on the active layer of the battery; associated circuits are corroded, etc. These mechanisms that cause attenuation are called potential-induced attenuation and polarization (Potential I...

AI Technical Summary

Problems solved by technology

When making the anti-reflection coating, the NH in the coating cavity 3 with SiH 4 The ratio of gas flow rate directly determines the level of refractive index. The conventional high refractive index anti-reflection coating is made by simply increasing the silane (SiH 4 ) ratio of flow rate, by low refractive index when NH 3 : SiH 4 10:1 increased to about 1:7 of the high refractive index, the open-circuit voltage and short-circuit current of the finished high-refractive anti-reflection film produced by this method are both reduced, resulting in a decrease in the conversion rate of the finished product by 0.05%~0.10%

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