Efficient and Stable Perovskite Solar Modules Enabled by Inhibited Escape of Volatile Species

Area of Science:

• Materials Science
• Photovoltaics
• Chemical Engineering

Background:

• Halide perovskite materials exhibit intrinsically weak bonding, leading to volatile components and decomposition in thin films.
• Perovskite film reactions are reversible if volatile components remain within the film.
• Improving the stability and efficiency of perovskite solar modules (PSMs) is crucial for their commercial viability.

Purpose of the Study:

• To develop a holistic approach to enhance the efficiency and stability of PSMs.
• To prevent the effusion of volatile components from halide perovskite thin films.
• To demonstrate the effectiveness of in situ generated channel barrier layers.

Main Methods:

• A novel method for in situ generation of channel barrier layers within PSMs was developed.
• The method focuses on preventing the escape of volatile components from the perovskite thin film.
• Perovskite photovoltaic modules (PSMs) were fabricated using this in situ barrier layer approach.

Main Results:

• The developed PSMs achieved a certified aperture power conversion efficiency (PCE) of 21.37%.
• The modules demonstrated remarkable continuous operation stability under maximum power point tracking (MPPT) for T90 > 1100 hours in ambient air.
• The PSMs also showed excellent damp heat (DH) stability, with T93 > 1400 hours.

Conclusions:

• The in situ generation of channel barrier layers is an effective strategy to improve PSM efficiency and long-term stability.
• Preventing volatile component effusion is key to overcoming the decomposition issues in halide perovskites.
• This approach offers a promising pathway for the commercialization of stable and efficient perovskite solar technologies.