Laminating Machine for HJT TOPCON IBC Module

Advantages of HJT cells:

High open circuit voltage,high conversion efficiency,2.Weak power degradation,3.Low temperature coefficient,stable output power,4.The symmetrical structure support lamination and double-sided power generation.5.the process is simple,6.can combine other technology,such as hetero-junction/perovskite-type cell.

Compared with the original 9-10 step process of PERC cell,the HJT cell process is reduced to four steps,which are:velvet cleaning,amorphous silicon deposition,TCO conductive film deposition,screen printing.The main equipment corresponding to these four processes are cleaning equipment,CVD(chemical vapor deposition)equipment,PVD(physical vapor deposition)equipment,screen printing equipment.

Topcon cells:

TOPCON cell technology is a new type of passivation contact solar cell proposed by the Fraunhofer Institute for Solar Energy in Germany in 2014.The Fraunhofer research center in Germany chemically prepared a layer of ultra-thin silicon oxide(~1.5nm) on the back of the cell,and then deposited a layer of doped polysilicon.The passivation contact structure formed by the two together is called the tunneling oxide passivation contact(TOPCON) technology.

The main benefits of the TOPCON solar cells include:（1）excellent interface passivaton performance;（2）Full-area carrier collection is beneficial to increase FF;（3）Simple structure without photolithography;（4）Can be compatible with the existing production line process,suitable for enterprise production。

IBC cells:

IBC(Interdigitated back contact)cell appeared in the 1970s,is the first products of the back connection cell,it was originally mainly applied to concentrator system.IBC technology process composition increase potential obviously,has the potential to develop industrialization in the future.

Compared with PERC、PERT and HJT，there is no grid line on the front surface of the cell,and the positive and negative electrodes are prepared on the back of the cell in the way of cross arrangement,which avoids about 5% shading loss of the conventional grid line on the front of the cell.

On the back side,the P+ and n+ interleaved electrodes contact the highly doped region by using the diffusion method.The point contact connection between the metal electrode and the emission region or base region is realized by opening holes in the dielectric film,and the back surface recombination rate of photogenerated carriers is reduced.

Due to the back contact structure,IBC have lower series resistance than traditional cells and higher filling factor.

In addition,IBC can be stacked with a variety of cell technology to further improve the efficiency space:（1）combined with TOPcon and HJT technology,respectively,to produce TBC（POLO-IBC）、HBC，the efficiency increased to more than 26%；（2）combined with perovskite techonology to makePSC IBC。

Please consult sales for more laminating machine for HJT TOPCON IBC module details.

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