Feb 25, 2025   SOURCE: PR NewsWire

Risen Achieves 30.99% Efficiency with HJT-Perovskite Tandem Solar Cells!

NINGBO, China, Feb. 25, 2025 /PRNewswire/ -- Breaking new ground in solar innovation! Risen's HJT (Heterojunction Technology), when combined with a perovskite cell in a tandem structure, has achieved an impressive 30.99% efficiency!

This milestone not only solidifies Risen's technological leadership but also paves the way for higher performance, lower LCOE (Levelized Cost of Energy), and greener solar solutions in the global energy transition.

What Are Tandem Solar Cells?
In tandem solar cells, different materials possess distinct bandgap energies, enabling them to absorb light of varying wavelengths. The upper-layer materials (such as perovskite) absorb high-energy short-wavelength light (e.g., blue and ultraviolet light), while the lower-layer materials (such as silicon) capture low-energy long-wavelength light (e.g., red and infrared light), thereby reducing energy waste.

The theoretical efficiency ceiling for single-junction cells is about 33% (Shockley-Queisser limit), whereas tandem structures with multiple junctions can elevate this limit to over 44%.

Why Are HJT-Perovskite Tandem Cells Game-Changers?

    --  Highest Efficiency Potential and Lower DegradationHJT cells already
        achieve top efficiencies and lower power degradation due to aging and
        temperature among commercial solar technologies, making them the ideal
        base for tandem integration.

    --  Better Electrical ConnectivityHJT cells use Indium Tin Oxide (ITO) as a
        transparent conductive layer, unlike BC, TOPCon, and PERC technologies,
        which rely on insulating layers. This simplifies the connection between
        stacked cells, improving overall performance.

    --  Sustainable ManufacturingHJT solar cells exhibit a lower carbon
        footprint, reduced material consumption, and lower energy and water
        usage during production, demonstrating significant environmental
        benefits and positioning them as a more sustainable photovoltaic
        technology.

    --  100% Production Line CompatibilityExisting HJT cell production lines
        feature forward-looking technological compatibility, enabling direct
        integration of perovskite cell equipment without requiring
        modifications. Through modular equipment expansion, co-production of
        perovskite and silicon-based cells can be achieved on the same line
        while maintaining existing operations. This approach safeguards prior
        investments and maximizes production line utilization.

    --  Breakthroughs in Module TechnologyRisen's Hyper-Link low-temperature
        stress-free interconnection technology overcomes limitations of
        traditional module encapsulation processes:
        --  Low-temperature processing (<150°C) aligns with perovskite
            materials' thermal sensitivity.
        --  Stress-free lamination ensures structural integrity of thin-film
            architectures.
        --  Multi-junction cell series connection efficiency can exceed 28%,
            driving next-generation photovoltaic performance.

Perovskite Challenges: The Road to Commercialization
Despite their advantages, perovskite technology still faces critical hurdles:

    --  Durability Gap: Current perovskite cells degrade rapidly under UV
        exposure and humidity (lifespan <5 years vs. silicon's 30+ years). Risen
        is pioneering nano-encapsulation and self-healing materials to address
        this issue.
    --  Manufacturing Complexity: Maintaining perovskite film uniformity at
        scale requires advanced deposition techniques.

Future Outlook: What's Next for Risen Energy?
Risen is already translating lab success into real-world impact:

    --  First 730W HJT Module Delivery: In January 2025, Risen completed a 100MW
        shipment of HJT Hyper-ion Pro 730W modules to Spain--the world's first
        730W+ project deployment.
    --  2025 Roadmap:
        --  HJT module power   740W (cell efficiency 26.8%)
        --  Tandem pilot production   800W prototypes
    --  2027 Vision: Launch 850W+ perovskite tandem modules with <0.25% annual
        degradation.

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SOURCE Risen Energy Co., Ltd