Poly crystalline solar cells 156x156mm with 4bb bus bars




Description:
1.Pid free
2.High conversion efficiency,average cell efficiency is 18.2%,highest efficiency is 18.8%
3.Excellent solder-ability through high quality
4.Long term efficiency stability and excellent reliability
5.Low breakage rate and low lid rate
6.Good color uniformity

 
             
                           Advantage                                               
 
-High photoelectric conversion ,high reliability.
-The unique expansion technology ensures the uniformity.
-The advanced PECVD technology makes the dark blue silicon nitride antireflection film uniform and beautiful in color.
-The back surface field and electrode made of high-quality metal paste ensure good electrical conductivity, reliable adhesion and good weldability.
-High precision silk screen printing and flatness makes auto welding and laser cutting much easier.




Features:

 
Product Description
                                      Poly-Crystalline Silicon Solar Cell 4BB
Physical Characteristics

Dimension          156mm*156mm+0.5mm
Thickness            wafer(si):200um+30um
                                           180um+30um/-20um
Front(-)               Blue silicon nitride AR coating 1.0mm silver busbar 4BB. 
                            Full-surface aluminum back-surface field 2.0mm silver continuous or discrete                             soldering pads.

Physical characteristics
Data under standard testing conditions(stc):1000w/sq.M, am1.5, 25ºc

Typical electrical characteristics
Electrical  characteristics 


Data under standard testing conditions(stc):1,000w/m2, am1.5, 25ºc, pmax:Positive power tolerance.

 Warranty: 
The quality of all cells is 100% safety guarantee because they are protectively warehoused.
Any quality problem (defective products) could be return, except that broken solar cell are required by customers.
All cells are tested before delivery as customers required.

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.