As the conversion efficiency of the regular single-junction crystalline silicon solar cells approaches its theoretical limit of 29.56%, the photovoltaic industry is actively exploring next-generation technologies capable of delivering even higher efficiencies.

According to the International Energy Agency (IEA), the next five years will represent a critical window for technological transformation in the global solar industry. With its exceptionally high theoretical efficiency, tandem perovskite solar technology is widely recognized as one of the most promising breakthroughs for the next generation of the photovoltaic industry.

However, long-term stability remains one of the primary barriers to large-scale commercialization, and encapsulation technology plays a decisive role in protecting perovskite materials throughout the module’s lifetime.

As the first company in the industry to initiate standards for perovskite encapsulation technology, Betterial has dedicated years to researching reliable encapsulation solutions for both perovskite and tandem perovskite modules.

The latest Betterial® Tandem Perovskite Encapsulation Film introduces five major technological breakthroughs, helping accelerate the commercialization of tandem perovskite photovoltaics.

1. Outstanding Pre-crosslinking and Peel Strength Under Ultra-Low-Temperature Lamination

Compared with conventional thermoplastic encapsulation films, the Betterial® Tandem Perovskite Encapsulation Film features a specially engineered reactive formulation that enables lamination at an ultra-low temperature of 110–120°C while achieving a crosslinking degree of 10–60%.

After a triple IEC accelerated aging sequence, the film maintains an excellent peel strength of more than 60 N/cm.

These properties ensure excellent resistance to thermal cycling while significantly improving the long-term reliability and durability of tandem perovskite modules.

2. Low-Temperature Crosslinking Technology with Zero Peroxide Residue

Developed jointly with internationally renowned chemical material suppliers over several years, Betterial has created a proprietary crosslinking system that leaves no peroxide residue after processing.

Its high-purity formulation prevents the release of small molecules from products, effectively eliminating the risk of chemical corrosion to the perovskite layer caused by peroxide decomposition residues found in conventional crosslinked encapsulation films.

This innovation helps preserve the structural integrity and long-term stability of perovskite devices.

3. Excellent Heat and Weather Resistance

Compared with traditional thermoplastic encapsulation materials, Betterial® Tandem Perovskite Encapsulation Film offers outstanding resistance to high temperature and high humidity and a low water vapor transmission rate (WVTR).

Laboratory testing demonstrates that after 150°C thermal baking for 48 hours and a 48-hour Pressure Cooker Test (PCT), the Betterial® Tandem Perovskite Encapsulation Film exhibits excellent resistance to yellowness and exceptional anti-yellowing performance, with module testing confirming no bubble issue or de-lamination.

4. Halide Ion Capture Technology for Perovskite Stability

Betterial® Tandem Perovskite Encapsulation Film incorporates specially engineered functional micro-scale and nano-scale materials featuring abundant mesoporous structures.

During long-term operation or accelerated aging, these materials efficiently capture and immobilize volatile halide ions—including:

  • Fluoride (F⁻)
  • Bromide (Br⁻)
  • Iodide (I⁻)
  • harmful lead ions (Pb²⁺)

Effectively suppresses harmful ion migration, significantly minimizing ion migration-induced perovskite passivation degradation and interfacial delamination.

Wide Compatibility with Multiple PV Technologies

Betterial’s tandem perovskite encapsulation technology offers a wide processing window and excellent material compatibility. In addition to tandem perovskite modules, it can also be adapted for various emerging photovoltaic technologies, including:

  • Single-junction perovskite modules
  • Thin-film photovoltaic modules
  • Lightweight photovoltaic modules

It demonstrates strong platform technology advantages.

Betterial’s tandem perovskite encapsulation technology provides a reliable material foundation for developing high-efficiency, long-lifetime, and low-degradation tandem perovskite modules.

Looking ahead, Betterial will continue advancing encapsulation material innovation to help the photovoltaic industry achieve higher efficiency, lower manufacturing costs, and a more sustainable energy future through reliable, high-performance encapsulation solutions.