JUNHE®2570 Topcon Auxiliary additives for removing amorphous silicon of Topcon cells

Short Description:

JUNHE®2570 is a series of auxiliary additives independently developed by Junhe Technology for the removal of amorphous silicon from photovoltaic Topcon cells. It is a water-soluble, non-toxic and harmless additive that meets environmental protection requirements. This product can greatly improve the corrosion selectivity of inorganic alkali on the amorphous silicon coating of Topcon battery. While achieving silicon etching, it can also greatly reduce the corrosion of inorganic alkali on the positive film silicon dioxide layer or PSG layer.

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Product Detail

Product Tags

Main Composition

Composition	Contents	CAS No.	EC No.
Pure water	90-92%	7732-18-5	231-791-2
Sodium carbonate	1.0-3.0%	5968-11-6	207-838-8
Acrylic block branched compound	1.0-2.0%	/	/
Surfactant	1.0-1.5%	25155-30-0	246-680-4
Preservative acid	0.1%-1.5%	137-40-6	205-290-4

Features

1. High environmental protection level: selective etching can be achieved without the use of organic bases such as TMAH;

2. Low production cost: Compared with the common pretreatment using hydrofluoric acid/nitric acid on the market, the production cost is greatly reduced;

3. High etching efficiency: Compared with the Perc battery process, the conversion efficiency is increased by more than 1.2%;

Wafer size	Appearance	Photoelectric conversion	Life
210	The etching surface is normal and the positive film has no corrosion.	24.4%~24.6%	240+

Technical Parameters

	/L First liquid dispensing	/L Liquid infusion	/L Intermission-draining	Temperature/degree	Reaction time/second
48%KOH	8~10	0.3~0.45	5~7	63~64	100~200
Additive JH2570	2.0~4.0	0.18~0.21
Pure water	440.0	/

These properties may vary depending on the single crystal wafer, process, batch, and size.

Applications

1、This product is aimed at removing amorphous silicon coating from topcon cells;

2、 Suitable for monocrystalline cells of 210, 186, 166, and 158 specifications.

Product Features

No.	Parameter	Main parameters and project indicators
1	Color, shape	Colorless to light yellow transparent liquid
2	PH value	7.0-10.0
3	density	1.05-1.5g/ml
4	Storage conditions	Store at room temperature away from light