What Are Heterojunction Technology (HJT) Solar Panels?

Heterojunction (HJT) technology has been gaining momentum recently because people have understood its real potential.

HJT Solar Panels Technology certainly solves some known limitations of other technologies like standard photovoltaic panels or PV panels. For example, these panels reduce the process of recombination, and they offer good performance in hot climates as well.

This technology was developed in the early 1990s. However, it became more popular in the last decade.

The cost of production is higher, but with technical advancement, this cost is going to be reduced further.

The deficiencies of standard c-Si modules are improved by Heterojunction solar panels.

This technology is more efficient, and it offers a longer lifespan than others.

Due to all these reasons, HJT panels bring many benefits like, lower temperature coefficient, better performance, and resilience to extreme temperatures.

Three materials are used for manufacturing HJT cells:

• Crystalline Silicon (c-Si): This is used for creating standard homojunction solar cells, which are used in conventional panels. Monocrystalline silicon is considered for HJT solar cells because it has a higher purity and efficiency.
• Amorphous Silicon (a-Si): This is used in thin-film PV technology. Amorphous silicon is the second most important material for manufacturing solar cells.
• Indium Tin Oxide (ITO): ITO is also a preferred material for the transparent conductive layer of the cell. Due to the conductivity and reflectivity of ITO, it becomes a better contact and external layer for the HJT solar cell.

Heterojunction solar cells: Classification

Heterojunction solar cells can be classified into two categories based on the doping type.

N-type c-Si wafers are the most popular doping type. These are doped with phosphorus. It offers an extra electron to negatively charge them.

P-type solar cells are more resistant to radiation levels. The p-type c-Si wafers are doped with boron.

Heterojunction solar cells: Key benefits

Heterojunction solar panels are very beneficial because of their technological merits. Here are some of the top benefits.

High efficiency

Experts say that the conversion efficiency of hetero junction is the most efficient solar technology. HJT Solar Panels are becoming more and more popular because of their higher efficiency.

When we talk about profitability and value for money, this technology is just a fit for that.

Higher temperature coefficient

Heterojunction solar cell technology is not affected by changes happening in the surrounding temperature. This is the reason they are suitable for outdoor locations.

This technology is effective outdoors as said before. However, this is equally useful indoors as well.

Improved bi-faciality

HJT cells have a high bi-faciality factor of 92%. It means you get a superior performance when you design it as a bifacial module.

Easy manufacturing process

Heterojunction solar cells have some additional steps in the manufacturing process. However, this does not make any increase in the overall cost. This technology involves 5-7 steps during manufacturing.

So, we can say that HJT cells are the new-age solar cells. This technology is taking over other technologies with a rapid speed and certainly it is the future of solar panels.

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