Technical preparation method of IBC battery

Abstract

The invention discloses a technical preparation method of an IBC battery, which comprises the steps of A, performing front texturing and back polishing on an n-type original silicon wafer, the front textured surface ranges between 1 micron and 10 microns in size, the reflectivity of the textured surface is 9%-13%, and the back polishing reflectivity is 30%-45%; B, forming a first doped region at the back, and then performing back selective partition to remove an oxide layer; C, performing partition texturing and etching by using KOH with the mass ratio being 1%-3%, an additive with the mass ratio being 3%-5% and an etching solution with the temperature ranging between 75 DEG C and 85 DEG C, wherein the reflectivity of an etched area is 20%-28%; and then D, forming a second doped region at the back, forming FSF at the front, depositing a passivation layer at the front and the back, and finally selectively forming metal electrodes of a p-region and an n-region at the back. After adopting the method, in the back metal printing process, the p-region and the n-region are distinguished by using the textured surface / polished surface to form surface state contrast, a CCD camera has different spectral responses at different surface states in metal printing, and thus quick and accurate alignment of metal printing is achieved.

Description

technical field [0001] The invention relates to a new energy photovoltaic crystalline silicon battery technology, in particular to an IBC battery technology preparation method. Background technique [0002] Solar photovoltaic power generation has great application prospects. The current development trend of the photovoltaic industry is to improve efficiency and reduce costs. However, the efficiency of conventional structural batteries has no room for improvement. High-efficiency crystalline silicon batteries have become the mainstream of market research and development. IBC is a back-contact back-junction battery, also known as an interdigital battery. The biggest feature of this battery is its high efficiency. At present, the efficiency of IBC batteries prepared by many scientific research institutes has reached 23%, which effectively reduces the temperature coefficient of the battery, making IBC batteries have a superior actual power generation capacity compared with conve...

AI Technical Summary

Problems solved by technology

[0004] However, for selective partitioning, the currently commonly used solutions suitable for industrialization in the industry are laser grooving or printing masks, etching pastes to remove the oxide layer, and then perform selective partition etching; in the back metal printing process , the p area and n area are polished surfaces, the surface state is consistent and no contrast, the CCD camera cannot clearly identify the alignment mark, resulting in difficulties in printing identification, the p area and n area are easily misaligned, the printing yield rate is 20%, and the parallel resistance is lower than 100Ω, that is to say, the existing method will lead to rapid and high-precision alignment that is not conducive to subsequent sequences