Method for preparing PERC screenless printing single crystal solar cell sheet

Abstract

The present invention discloses a method for preparing a PERC (Passivated Emitter and Rear Cell) screenless printing single crystal solar cell sheet. A single crystal silicon wafer is used as a base material, and the PERC screenless printing single crystal solar cell sheet is prepared by the sequential steps of texture surface making, diffusion, etching, back passivation, anti-reflection film plating, laser grooving on the back surface, back electrode, back electric field and positive electrode printing, sintering, and light failure reduction. The step of back passivation is to plate Al2O3 andSiNX on the back surface of the silicon wafer; the step of the anti-reflection film plating is to plate the SiNX on the front side of the silicon wafer; and the step of the back electrode, back electric field, and positive electrode printing is to use silk-screen printing, and the positive electrode printing plate uses a screenless printing plate. According to the method for preparing the PERC screenless printing single crystal solar cell sheet provided by the present invention, the LID of the cell sheet can be reduced to around 1%, the power of the component product is improved, conversion efficiency is high, and both the grade and electrical properties are significantly improved.

Description

technical field [0001] The invention belongs to the technical field of solar cell preparation, and in particular relates to a method for preparing a PERC grid-free printed monocrystalline solar cell. 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 effic...

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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