HJT Solar Panel

The PV industry is constantly exploring innovative manufacturing processes, new materials, solar cells, and module designs to maximize the device’s performance and lower the final energy cost. One of the latest technologies in the consumer solar panel market is heterojunction solar cells. Heterojunction solar cells combine two technologies into one cell: a crystalline silicon cell sandwiched between two layers of amorphous “thin-film” silicon. This increases the efficiency of HJT Solar Panels and more energy to be harvested easily compared to conventional silicon solar panels. 

At Coulee, we have chosen the industry’s most superior materials and combined them with our nearly fully automated manufacturing system. We offer consistently high-power modules that will last a lifetime. Each material has been carefully tested to meet our best-in-class standards. Welcome to talk with our professionals: info@couleenergy.com, +1 73 7702 0119.

What Benefits does HJT Solar Panel Offer?

High Efficiency
With a 26.07% conversion efficiency for mono-facial modules and more than 30% for bifacial, the heterojunction solar panel is one of the industry’s most efficient solar products. This makes it convenient for applications with limited space, areas requiring large generation capacities, and others.

Longer Lifetime, a Higher Yield
The PV industry focuses on improving efficiency to satisfy the asks for higher and higher module power. And also, the EPCs are playing a decisive role in today’s PV market and are interested in the best LCOE. That pushes us to adopt HJT solar technology to lower the cost. HJT has a longer lifetime for generating electricity, hence a higher yield than any other high-efficiency technology.

Good Temperature Coefficient
Heterojunction solar cell technology is less affected by changes in temperature. This makes it great for applications in locations with high temperatures, which can negatively affect the performance of standard c-Si modules.
The HJT solar cell structure combines two different technologies into one cell: a crystalline silicon cell sandwiched between two layers of amorphous “thin-film” silicon. This way, thin film solar has a better temperature coefficient than crystalline silicon. Like, Excellent weak light performance and better performance in a hot climate. This high-performing solar cell allows for excellent power generation worldwide in all environments, especially in hotter temperatures.

High Bifaciality
HJT cell has a high bifacially factor of 92%, making HJT deliver outstanding performance when designed as a bifacial module. This technology is becoming more popular for utility-scale applications, which seek to take advantage of the albedo resource.

Easy Manufacturing Process
Heterojunction solar cell technology only involves 5-7 steps during manufacturing, and the price for the necessary equipment is constantly being reduced, showing great promise for the future of HJT.

What is HJT Solar Technology?

HJT solar cells have a double-sided structure design that can absorb incident light and scattered light from both sides; using a PECVD, a very thin silicon intrinsic passivation layer and P-type silicon doped layer are formed on the top side of wafer-type monocrystalline silicon N after texturing. Surface cleaning, then on the other side, a skinny intrinsic silicon passive layer and N-type silicon doped layer are deposited.
After the deposition of amorphous silicon layer stacks, PVD magnetron sputtering coating technology is applied to deposit transparent oxide conductive film (TCO) and metal stack on both sides of the cells.
Finally, our innovative metallization technology forms the metal grids on both sides.

What do HJT Solar Cells Look Like?

HJT solar cell looks just like a conventional solar Mono PERC cell; it can be in M2, M6, M10, G12/M12 size, multi-bus bar, and a half-cut cell. However, due to the different cell production processes, the HJT cell has a better bifaciality and darker color, which is also better than a normal mono cell in cell color difference.

HJT Solar Panels VS Traditional Crystalline Silicon Panels

Heterojunction technology is based on traditional c-Si panels, improving the recombination process and other significant flaws. HJT solar panel improves deficiencies found in standard c-Si modules, reducing surface recombination. This technology holds a higher recorded efficiency and enhances the lifespan of the modules. As a result of the improvements, HJT panels have a lower temperature coefficient, resulting in better performance under different extreme temperatures.

	Heterojunction (HJT)	Monocrystalline Silicon	Polycrystalline Silicon
Materials (Absorber Layer)	Mono c-Si a-Si: H	Mono c-Si	Poly c-Si
Structure	Mono c-Si wafer-based layer encased in a-Si: H passivating layers	Mono c-Si p-n junction	Poly c-Si p-n junction
Lifespan	≥ 30 years	≥ 25 years	25 years
Temperature Coefficient (Average)	26.07%/℃ (-0.21%/ºC)	-0.446%/ºC	-0.387%/ºC
Highest Recorded Efficiency	26.7% (June 2022)	25.4% (July 2022)	around 20%

HJT Solar Panels VS Bifacial Panels

The structure of bifacial panels is similar to the heterojunction solar panel. Both include passivating coats that reduce resurface combinations, increasing their efficiency.
HJT technology holds a high recorded efficiency of 26.7%, but bifacial surpasses this with an efficiency of over 30%. The curious side is that the bifacial PV module used to achieve that efficiency combines HJT technology with bifacial and other technologies.
HJT cells can be designed for mono-facial or bifacial usage, which reduces the reasons to compare them against each other since they can be combined to create superior bifacial HJT solar panels. The significant difference is that bifacial can use different base technologies from HJT technology.

Heterojunction Technology in the Future

HJT solar cell is a promising technology with high recorded efficiencies. The technology allows the solar industry to increase the efficiency of the day-to-day PV module and decrease the Levelized Cost of Energy (LCOE) regarding solar power.
With an expected price of $0.19/W for 2029-2030, HJT technology could hold 20% of the retail market.