FLAGSUN 6 Inch 156x156  / 4BB Poly Crystalline Silicon Solar Cells

High photoelectric conversion efficiency and reliability. A unique technology is used during the diffusion process to ensure uniformity. Its external uniformity is controlled with the use of an advanced PECVD forming technology, giving each solar cell its smooth surface coated dark blue silicon nitride antireflection coating. A high-quality metal paste is applied to each cell's back and lining to guarantee good electrical conductivity, reliable electrode absorption and adhesion. High-precise PSG etching and texturing makes each cell easier for post-production welding and laser cutting.

Solar Cell Production Line


Cleaning & Texturing: Wafers are cleaned with industrial soaps and form square-based pyramids also called texture. The texturization helps to reduce the reflection of sunlight. 

Diffusion: Wafers that have been pre-droped with boron during the casting process are then given a negative(n-type) surface characteristic by diffusing them with a phosphorus source at high temperature, which in turn creats the negative/positive(n-p) junction.

Etching: Phosphorus diffuses not only into the desired wafer surface but also into the side and the opposite surface to form PN. This gives a shunt path between the cell front and rear. Removal of the path around the wafer edge/edge junction isolation is named etching.

PECVD: By PECVD equipment, the wafers are coated with anti-reflection coating(ARC). It's the blue silicion nitride film to reduce reflection and promote absorption of light.

Printing & Heating: it was adopted by printing paste with screen technology to print the electrodes of silicion solar, and form a good ohmic contact.
Testing & Sorting: It means classifying the cells according to their efficiency tested under the simulated sunlight.