TOPCon vs. HJT solar technologies: a comprehensive comparison

As the demand for clean and renewable energy continues to rise, solar technology advancements have paved the way for highly efficient solar cells. Two prominent contenders in the field of photovoltaics are TOPCon (Tunnel Oxide Passivated Contact) and HJT (Heterojunction) solar technologies. In this article, we will provide a concise overview of these technologies, highlighting their features and comparing their performance in various aspects.

TOPCon Technology solar panels

TOPCon solar technology: the basics

TOPCon solar technology is an innovative approach that aims to improve the efficiency and performance of solar cells. It utilizes a thin tunnel oxide layer and passivated contacts to minimize energy losses and increase light absorption. The tunnel oxide layer allows for efficient charge carrier transport, while the passivated contacts reduce recombination losses, resulting in higher overall efficiency.


Discover all about TOPCon solar cells in this article:
Exploring TOPCon Solar Cells: The Next Generation of Photovoltaic Technology

Benefits of TOPCon technology

  1. Superior efficiency: TOPCon technology has demonstrated excellent efficiency levels, exceeding 25% in laboratory settings. The enhanced charge carrier collection and reduced recombination losses contribute to its exceptional performance, enabling the generation of more electricity from the same amount of sunlight.
  2. Better temperature coefficient: TOPCon solar cells exhibit a lower temperature coefficient compared to traditional solar technologies. This means they experience a smaller decrease in performance as temperatures rise, ensuring more stable and reliable power output in hot climates.
  3. Durability and longevity: The use of passivated contacts in TOPCon technology reduces the risk of degradation and extends the lifespan of the solar cells. This makes TOPCon panels a reliable and long-lasting solution for solar energy production.


HJT solar technology: the basics

HJT solar technology combines the advantages of crystalline silicon and thin-film solar cells. It involves the formation of a heterojunction between different layers of materials, such as amorphous silicon and crystalline silicon, to enhance light absorption and reduce energy losses.

Benefits of HJT technology

  1. High efficiency: HJT solar cells have achieved impressive conversion efficiencies, surpassing 23% in laboratory conditions. The combination of crystalline silicon and amorphous silicon layers optimizes light trapping and minimizes energy losses, leading to improved overall efficiency.
  2. Low temperature coefficient: Similar to TOPCon, HJT solar cells also exhibit a low temperature coefficient, ensuring better performance in high-temperature environments. This characteristic makes them suitable for regions with hot climates or installations exposed to direct sunlight.
  3. Aesthetics and design flexibility: HJT technology allows for transparent and color-selective solar cells, offering design flexibility and potential integration into various architectural elements. This feature makes HJT solar panels an attractive option for applications where aesthetics play a crucial role.

Comparison of TOPCon and HJT technologies:

  1. Efficiency: While both TOPCon and HJT technologies have achieved high efficiencies, TOPCon technology often outperforms HJT in terms of overall conversion efficiency. The optimized charge carrier transport and reduced recombination losses in TOPCon cells contribute to their higher efficiency levels.
  2. Temperature performance: Both technologies exhibit low temperature coefficients, ensuring better performance in high-temperature conditions. However, TOPCon cells have shown superior temperature stability, making them more reliable in hot climates.
  3. Durability: The passivated contacts in TOPCon cells enhance their durability and longevity, minimizing the risk of degradation over time. This gives TOPCon technology an edge in terms of long-term performance and reliability.


Want to know the main differences between TOPCon technology and IBC solar panels?
TOPCon VS IBC solar panels: a comparison of the highest energy yielding performance technologies


TOPCon and HJT solar technologies represent significant advancements in photovoltaics, offering high efficiency and improved performance. While HJT technology boasts design flexibility and competitive efficiency levels, TOPCon technology stands out with its superior efficiency, temperature stability, and enhanced durability. When it comes to maximizing energy generation and ensuring long-term reliability, TOPCon technology emerges as the most beneficial choice for harnessing the power of the sun.


All our solar panels operate with the power of this cutting-edge technology. With a solution for every need and budget, every consumer will find a suitable solar panel from our range. Interested in what we can offer you? Discover it on our website.

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