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What Is Heterojunction (HJT) Solar?

HJT is the acronym for hetero-junction solar cells. Introduced by Japanese company Sanyo in the 1980s, then acquired by Panasonic in 2010s, HJT is considered as a potential successor to the popular PERC solar cell as of the time of writing, besides other technologies such as PERT and TOPCON.

How does HJT work?

Heterojunction solar panels are composed of three layers of photovoltaic material. HJT cells combine two different technologies into one: crystalline silicon and amorphous “thin-film” silicon.

The top layer of amorphous silicon catches sunlight before it hits the crystalline layer, as well as light that reflects off the below layers. However, monocrystalline silicon, the middle layer, is responsible for turning most of the sunlight into electricity. Lastly, behind the crystalline silicon is another amorphous thin-film silicon layer. This final layer captures the remaining photons that surpass the first two layers.

Advantages of Heterojunction Solar Cells:

Higher efficiency.

JG Solar HJT panels that are currently on the market have efficiencies ranging from 21.0%–22.8%. This is a massive improvement compared to other conventional monocrystalline cells. It is by far the highest solar panel efficiency of HJT mass production.

On average, thin-film photovoltaic modules have a life expectancy of up to 25 years, while HJT solar cells can remain fully functioning well over 30 years.

Life expectancy

Cost savings

The amorphous silicon used in HJT panels is a cost-effective photovoltaic technology. This thin-film solar requires shorter manufacturing compared to other technologies. Because of its simplified manufacturing process, HJT has the potential to be more affordable than alternative solutions.

Resilience and adaptability

This technology was developed for excellent production capabilities, even in extreme weather conditions. HJT panels have lower temperature coefficient than conventional solar panels, ensuring high performance at elevated external temperatures.