Preparation method for PERC double printing polycrystalline solar cell

Abstract

The invention discloses a preparation method for a PERC double printing polycrystalline solar cell. The PERC double printing polycrystalline solar cell is obtained by taking a polycrystalline siliconwafer as a base material and sequentially performing the steps, namely flocking, diffusion, etching, annealing, back passivation, antireflection film plating, back laser grooving, printing, sinteringand light attenuation reduction; in the annealing step, oxygen-free annealing is adopted, in the back passivation step, Al2O3 and SiNX are plated on the back of the silicon wafer, in the antireflection film plating step, SiNX is plated on the front of the silicon wafer, during positive electrode printing, a silk screen printing machine is adopted for printing twice, namely DP1 and DP2, a secondarygrid line is printed during the DP1, a main grid line and the secondary grid line are overprinted during the DP2, and a silk screen printing plate used in the printing DP1 and the printing DP2 is a knotless silk screen printing plate. The preparation method provided by the invention and for the PERC double printing polycrystalline solar cell can reduce LID of the solar cell to be about 1%, powerof a module finished product can be increased, conversion efficiency is high, and grade and electrical properties are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of solar cell preparation, and in particular relates to a preparation method of PERC secondary printing polycrystalline solar cells. Background technique [0002] With the increasing tension of global energy sources, solar energy has been widely valued by countries all over the world due to its unique advantages such as no pollution and large market space. Solar cell, also known as "solar chip" or "photovoltaic cell", is a device that uses the photovoltaic effect to directly convert solar energy into electrical energy. It mainly includes crystalline silicon cells, semiconductor cells, inorganic cells, organic cells, etc., among which crystalline silicon solar cells Dominant position in the mainstream of the market. [0003] The current mainstream technology of crystalline silicon solar cells is PERC (Passivated Emitter Rear Cell) - emitter and rear passivation cell technology, which improves conversion effi...

AI Technical Summary

Problems solved by technology

However, existing PERC cells generally have the problem of light-to-decay (LID), and LID can cause module power to decay by as much as 10% or more.

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