All About HJT – The Secret of Heterojunction Solar Cell Technology
- EnergyChannel - United States.
- Jan 2
- 2 min read
Heterojunction (HJT) technology is transforming the solar industry with its high-efficiency and superior long-term performance. But what makes it stand out from technologies like PERC and TOPCon? How does HJT achieve these advantages?
In the "All About Heterojunction" series, we will delve into Huasun's cutting-edge HJT solutions, where efficiency meets innovation in the world of solar energy!
01: Unique Hybrid Structure
In HJT cells, an n-type crystalline silicon (c-Si) wafer is sandwiched between intrinsic amorphous silicon (i-a-Si:H) layers. The front is coated with n-type microcrystalline silicon (μc-Si:H), while the back uses p-type μc-Si:H, forming efficient p-n “heterojunctions”. The intrinsic layer passivates the surface, leading to following benefits:
Natural Bifacial-symmetrical Structure
Capable of capturing light from both sides for increased power generation: HJT solar cell's inherent bifacial symmetrical structure and distinctive material properties can facilitate enhanced charge carrier mobility and mitigate the risk of hotspots, ensuring consistent energy output even in scorching heat, with minimal power and efficiency loss.
Higher Cell Efficiency
Reduce recombination and improve charge separation, leading to higher energy conversion.
Optimized Temperature Coefficient
With a superior temperature coefficient of -0.24%/℃, projects utilizing HJT modules can significantly mitigate power loss, particularly in arid and hot environments such as desert scenarios, ultimately realizing higher energy yield.
02: Transformative Evolution of HJT Technology
HJT technology, first developed by Sanyo Corporation of Japan in 1990, was industrialized around 2010. Over the past three decades, it has consistently achieved record-breaking photovoltaic efficiencies.
With a maximum cell efficiency of 29.20%, closely approaching the 29.40% of monocrystalline silicon cells, HJT is widely regarded as the next-generation solar cell technology. Huasun's Himalaya G12 HJT solar cell, now achieving 26.50% efficiency in mass production, represents a significant advancement in the HJT sector.
03: Simplified Production
Unlike conventional cells such as PERC and TOPCon, which require over 10 complex steps, the HJT cell manufacturing process involves just 4 simple steps. This streamlined approach results in lower costs, higher production efficiency, and reduced energy consumption.
04: Superior Bifacial Generation
HJT cells feature a natural bifacial symmetrical structure, allowing HJT modules to achieve a bifaciality of nearly 100%, resulting in enhanced bifacial power generation performance. According to performance calculations, under identical conditions, HJT modules deliver approximately 2%-5% higher energy yield per watt compared to bifacial TOPCon modules.
05: Innovative Application of HJT
HJT modules offer several key advantages for vertical installations. Their exceptional efficiency and power output, combined with nearly 100% bifaciality, significantly enhance energy generation. The design also enables optimal use of space, leading to a substantial reduction in required floor area.
Additionally, HJT modules are characterized by very low operating and maintenance costs, further improving their overall economic feasibility. These attributes contribute to outstanding performance in power generation, making them ideal for a variety of vertical installation applications, such as agricultural farms, rangelands, and highway guardrails.
With HJT technology at its core, Huasun aims to boost clients' confidence in the future of solar energy by delivering higher product efficiency, more stable power generation, superior quality assurance, and advanced technology expansion capabilities.
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