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HJT Technology: Yesterday, Today, and Tomorrow

Updated: Dec 21, 2023

HJT technology, or heterojunction technology, is a type of solar cell technology that has been around for decades, but it has only recently begun to gain traction in the commercial market. This is due to a number of factors, including the high cost of production and the complexity of the manufacturing process. However, as technology has improved and costs have come down, HJT is becoming increasingly popular as a viable alternative to traditional solar panel technologies.


What is HJT Technology


First and foremost, what is HJT technology? In technical terms, Heterojunction technology (HJT) is a new type of bifacial solar cell that uses a combination of crystalline silicon and amorphous silicon thin-film layers to achieve unparalleled efficiencies and performance.


In simpler terms, HJT stands at the forefront of solar innovation, pushing the boundaries of conversion efficiency – a vital pursuit in the solar industry for decades. However, what truly sets HJT apart is its capability to manufacture solar cells at significantly lower temperatures compared to other solar technologies. Not only that, but HJT accomplishes this feat with fewer process steps, earning its title as the champion of carbon reduction.


So, in essence, HJT is not just a technological marvel; it's a game-changer in the pursuit of sustainable and efficient solar power.


The History of HJT Technology Development


HJT technology was first developed in the early 1980s by researchers at Sanyo Electric (now Panasonic). The first HJT solar cells were made using a-Si:H (amorphous hydrogenated silicon) thin films deposited on crystalline silicon wafers. However, these early HJT cells had low efficiencies and were expensive to produce.


In the late 1990s, Sanyo Electric developed a new HJT cell structure that used a-Si:C (amorphous silicon carbide) thin films instead of a-Si:H thin films. This new HJT cell structure had higher efficiencies and was lower cost to produce.


In the early 2000s, Sanyo Electric began commercializing HJT solar panels. However, HJT solar panels remained expensive due to the complexity of the manufacturing process.


In recent years, the cost of HJT solar panels has come down significantly due to improvements in manufacturing technology. As a result, HJT solar panels are now becoming increasingly competitive with other solar panel technologies.


Why HJT Technology is Gaining Momentum Today


HJT technology is gaining momentum in the solar industry for several reasons.


  • High efficiency: Heterojunction (HJT) solar panels exhibit the potential for superior efficiency compared to conventional solar panels. This translates to the ability to harness more electricity from an equivalent amount of sunlight. In recent developments, HJT solar modules for mass production have achieved efficiencies exceeding 25%. In contrast, TOPCon modules offer slightly lower efficiency, while PERC modules lag significantly behind. This heightened efficiency is particularly advantageous in scenarios where space constraints exist or when optimizing energy production is paramount.

  • Lower temperature coefficient: HJT solar panels have a lower temperature coefficient than traditional solar panels, meaning they are less affected by high temperatures. This makes them ideal for use in hot climates, where traditional solar panels may perform less efficiently.

  • Improved durability: HJT solar panels are more durable than traditional solar panels, making them less susceptible to damage from hail and other extreme weather conditions.

  • Declining costs: Historically, the cost of HJT solar panels has posed a substantial barrier to their mass production. However, the recent decline in costs is making them increasingly affordable and appealing.

  • Growing popularity of bifacial solar panels: HJT solar cells are naturally bifacial, meaning they can generate electricity from both the front and back of the cell. This makes them ideal for applications where there is a lot of reflected light, such as rooftops and solar farms.


Overall, HJT technology offers a number of advantages over traditional solar panel technologies, making it an attractive option for a wide range of applications. As costs continue to decline and manufacturing processes improve, HJT is expected to play an increasingly important role in the future of solar energy.


The Future of HJT Technology


The future of Heterojunction (HJT) technology appears exceptionally promising. With ongoing cost reductions and continuous advancements in manufacturing processes, HJT is poised to emerge as the leading solar cell technology worldwide.


A particularly exciting development on the horizon involves the potential synergy between HJT technology and perovskite solar cell technology. Perovskite solar cells represent a cutting-edge innovation known for their high efficiency and the prospect of even more cost-effective production compared to HJT solar cells. By integrating HJT and perovskite technologies, there is the tantalizing possibility of creating solar panels with efficiencies exceeding the 30% mark. This innovative fusion holds significant potential for the evolution of solar energy solutions in the coming years.


Metawolf HJT Solar Panels


Metawolf Solar is a leader in the development and manufacturing of HJT solar panels. We offer a wide range of HJT solar panels to meet the needs of our customers, from residential rooftops to large-scale solar farms.


Our HJT solar panels are known for their high efficiency, durability, and reliability. They are also backed by a comprehensive warranty of 30 years for both the product and power.


If you are looking for the most efficient and reliable solar panels on the market, Metawolf HJT solar panels are the right choice for you.

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