Low-temperature silver paste for low-density HIT solar cell and preparation method thereof

Abstract

The invention relates to a low-temperature silver paste for a low-density HIT solar cell, and a preparation method thereof. The low-temperature silver paste for the low-density HIT solar cell comprises low-apparent density silver powder, resin monomer, solvent, and an initiator for resin monomer curing; the weight percent of the low-apparent density silver powder in the low-temperature silver paste for the HIT solar cell is 30-90%, the weight percent of the resin monomer in the low-temperature silver paste for the HIT solar cell is 0.1-10%, and the weight percent of the curing initiator in thelow-temperature silver paste for the HIT solar cell is 0.1-5%. The-temperature silver paste disclosed by the invention has the advantages that the low-apparent density silver powder is creatively used for preparing the low-temperature silver paste for the low-density HIT solar cell, the low-temperature silver paste for the low-density HIT solar cell with low density and high conductivity is prepared by selecting the silver powder size, the morphology and apparent density under the low silver powder adding amount. The silver powder adding amount is reduced in the premise of guaranteeing the conductivity, the manufacturing cost of the low-temperature silver paste for the low-density HIT solar cell is greatly reduced, and the density of the low-temperature silver paste for a low-density HITsolar cell can be reduced a half and more by using the low-apparent density silver powder, thereby greatly reducing the consumption of the low-temperature silver paste in the manufacturing of the HIT.

Description

technical field [0001] The invention relates to the field of polymer-based conductive materials, in particular to a low-temperature silver paste for low-density HIT solar cells and a preparation method thereof. Background technique [0002] A solar cell is a photoelectric device that directly converts sunlight energy into electrical energy through the photovoltaic effect. Traditional solar cells are crystalline silicon solar cells. In recent years, the industry has introduced a heterojunction (Heterojunction with Intrinsic Thin-layer, HIT) solar cell. Heterojunction technology (HIT) combines the dual advantages of crystalline silicon solar cells and thin film technology, depositing intrinsic and doped amorphous silicon thin films and transparent conductive oxide (TCO) films on both sides of n-type silicon wafers to Absorb the electricity generated, because amorphous silicon has the characteristics of strong light absorption and excellent passivation performance, it can achi...

AI Technical Summary

Problems solved by technology

Among them, spherical silver powder with an average particle size of 2-20um, a specific surface area of ​​0.1-2.0 square meters per gram, and a bulk density of 3-10 grams per cubic centimeter is used as the conductive filling material. In order to ensure the conductivity of the low-temperature slurry, the spherical silver powder The filling ratio is as high as 90%, which leads to the high price of the prepared low-temperature paste for HIT solar cells