What are HJT Solar Panels?

HJT Solar Panels is Heterojunction solar cells that combine two different cell technologies into one cell crystalline silicon cell sandwiched between two layers of amorphous. This combination increases the efficiency of the cell’s conversion of light into electricity making it one of the most efficient solar cells currently available. HJT Solar Panels where first founded by SANYO Electric in 1980s which recorded efficiencies of 21% at the time which was shocking to the huge potential of solar panels making HJT Solar cells a strong pillar in today’s solar energy hype. Also, there are predictions that the HJT Solar Panels will have around 70% market share by 2030.

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What are the advantages and disadvantages of HJT Solar Panels?


  • 1-Higher efficiency: HJT Solar Panels have higher efficiency than all other types that reaches 21% and expected to reach 30% in the coming years making it very competitive technology in the market.
  • 2-Lifetime: HJT Solar Panels can reach a lifetime of 30 years and expected to exceed this period as the technology develops further.
  • 3-Cost: HJT Solar Panels are cheaper as they use amorphous layers that are much cheaper than other materials used in normal silicon cells.


  • 1-Manfacturing equipment: HJT Solar cells use very expensive manufacturing equipment to produce such cells in the required quantity which will need large investment cost to setup a production line for HJT Solar Panels.
  • 2- Technology Development: HJT Solar Panels are very fast in the technology development which makes it very hard for manufacturers to produce large batches because as they start producing a new developed HJT is ready to be implemented.

What are the use cases of HJT Solar Panels?

  • 1-un-even surfaces: HJT Solar Panels have the flexibility making them suitable for different kinds of applications that don’t have even surface or need to be bent somehow.
  • 2- rooftops: HJT Solar Panels are used all types of rooftops either homes or industrial because they are more efficient & their shape is non-disturbing appearance on the rooftop it is installed on. Compared to the normal crystalline solar cells that always look very odd on any rooftop.

What is HJT?

HJT, which stands for Heterojunction Technology, represents a revolutionary leap in solar panel design. HJT solar panels are at the forefront of photovoltaic technology, combining the best of both worlds: the efficiency of crystalline silicon and the innovative characteristics of thin-film solar cells. These panels are created using a cutting-edge approach that pairs amorphous silicon (a-Si) and crystalline silicon (c-Si) to maximize energy production. HJT panels are often dubbed the 'gold standard' in solar technology due to their remarkable efficiency, superior performance in various conditions, and sustainability features.

Advantages of HJT Technology

HJT technology offers a plethora of benefits, which have made it an attractive choice for solar installers and project managers. Let's delve into these advantages:

1. Exceptional Efficiency:

HJT panels are renowned for their outstanding energy conversion efficiency. They consistently outperform traditional solar panels by leveraging the synergies between crystalline silicon and amorphous silicon layers. This high efficiency means that HJT panels can generate more electricity from the same amount of sunlight, ultimately leading to greater energy production and cost savings for solar system owners.

2. Enhanced Low-Light Performance:

One of the standout features of HJT panels is their ability to perform exceptionally well in low-light conditions. Traditional silicon panels tend to exhibit a significant drop in efficiency during overcast days or early morning and late evening hours. HJT panels, on the other hand, maintain a high level of productivity even when sunlight is limited. This characteristic is particularly valuable in regions with inconsistent weather patterns.

3. Improved Temperature Coefficient:

HJT technology incorporates innovative design elements that minimize the impact of temperature fluctuations on panel performance. This results in a more stable and consistent output over a wide range of operating temperatures. HJT panels are better equipped to handle extreme heat or cold, ensuring that they continue to produce power efficiently, even in adverse weather conditions.

4. Enhanced Aesthetics:

Solar aesthetics are becoming increasingly important, especially in residential and commercial installations where visual appeal matters. HJT panels offer a sleek, all-black appearance that blends seamlessly with various architectural styles. This superior aesthetic quality contributes to the overall attractiveness of the solar installation, making it an ideal choice for projects where appearance matters.

5. Durability and Longevity:

HJT panels are built to last. Their robust design, along with the utilization of high-quality materials and manufacturing techniques, results in panels that exhibit minimal degradation over time. This extended lifespan reduces the maintenance and replacement costs associated with solar installations, offering long-term reliability to both homeowners and commercial users.

6. Reduced Degradation Rates:

HJT panels experience significantly slower degradation rates compared to conventional silicon panels. This means that over the years, HJT panels will maintain their efficiency and performance at a much higher level, providing consistent and reliable energy production. Slower degradation translates to better long-term returns on investment for solar system owners.

7. Reduced Space Requirements:

The high efficiency of HJT panels means that less physical space is needed to generate the same amount of power compared to traditional panels. This is especially advantageous in situations where available space for solar installations is limited. HJT panels allow for the installation of more solar capacity in a smaller area, maximizing the use of available real estate.

8. Eco-Friendly Manufacturing:

HJT technology is not only focused on producing efficient panels but also on reducing the environmental impact of solar manufacturing. The manufacturing process involves fewer hazardous materials and consumes less energy, making it a more eco-friendly choice. This aligns with the broader sustainability goals of many solar projects.

9. High Power Output:

The combination of higher efficiency, lower degradation, and the ability to capture sunlight in low-light conditions results in a remarkable power output from HJT panels. This feature is particularly valuable in areas with limited access to direct sunlight or shorter daylight hours.

10. Technological Advancements:

HJT technology is continuously evolving, with ongoing research and development efforts aimed at enhancing its performance further. This means that as the technology continues to mature, we can expect even greater advantages and improvements in HJT panels, making them an attractive choice for future solar installations.

Techniques Employed by Solar Manufacturers

HJT technology may sound impressive, but how do manufacturers incorporate it into solar panels? The process involves several key techniques that make HJT panels possible:

1. Thin-Film Deposition:

Solar manufacturers apply a thin layer of amorphous silicon on both sides of a crystalline silicon wafer. This amorphous silicon layer acts as a passivation layer, reducing surface recombination and improving cell efficiency.

2. High-Temperature Annealing:

After thin-film deposition, the panels undergo high-temperature annealing to optimize the interface between the amorphous and crystalline silicon layers. This step is crucial for achieving the desired HJT characteristics.

3. Selective Emitter Formation:

Solar cells are equipped with selective emitters to enhance electrical conductivity and reduce energy loss. The selective emitter design is fine-tuned to maximize efficiency.

4. Back-Contact Design:

HJT panels often incorporate a back-contact design, which eliminates shading on the front side of the panel and maximizes energy capture.

Applications of HJT Technology

Now that we've explored the techniques involved in manufacturing HJT panels, let's take a look at where this groundbreaking technology finds its applications:

1. Residential Solar Installations:

HJT panels are an excellent choice for homeowners looking to maximize the energy production of their rooftop solar systems. Their efficiency and aesthetic appeal make them a popular choice.

2. Commercial and Industrial Projects:

For larger-scale solar installations, such as those on commercial and industrial buildings, HJT panels provide exceptional performance, ensuring a faster return on investment.

3. Utility-Scale Solar Farms:

HJT technology is increasingly finding its place in utility-scale solar farms, where its high efficiency and durability help generate a significant amount of power.

4. Off-Grid Applications:

HJT panels are suitable for off-grid and remote applications, where they can harness energy even in challenging environmental conditions.

How to Identify HJT Panels

For solar installers, procurement managers, and EPC professionals, identifying whether a solar panel utilizes HJT technology is crucial. Fortunately, it's not a complex task. Here's how you can do it:

1. Manufacturer's Documentation:

Start by checking the manufacturer's specifications and documentation for the solar panels. Many manufacturers mention the technology used in their products, including HJT.

2. Model Number:

Look for the model number of the solar panel. You can often find this information on a label attached to the panel. The model number may contain codes or references that indicate HJT technology.

3. Visual Inspection:

HJT panels typically have a distinctive appearance with a uniform black color. Their sleek design sets them apart from traditional silicon panels. You can compare the visual characteristics of the panels to determine whether they are HJT.

4. Consult with the Supplier:

If in doubt, reach out to your panel supplier or manufacturer directly. They can provide you with detailed information about the technology used in their panels.   In conclusion, Heterojunction (HJT) solar panels are a game-changer in the world of solar energy. With their exceptional efficiency, durability, and suitability for a wide range of applications, they are a top choice for solar installers, procurement managers, and EPC professionals. Identifying HJT panels is relatively straightforward, and it's well worth the effort for the superior performance and long-term benefits they offer. As we continue to embrace renewable energy solutions, HJT technology stands as a shining example of how innovation can drive sustainability and power our future.