Tailored Colloidal Shapes in Precursor Solutions for Efficient Blade-Coated Perovskite Solar Modules

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Metal halide perovskite solar cells (PSCs) are promising for next-generation photovoltaics.
• Blade-coating PSCs typically show poorer film morphology than spin-coated ones, limiting efficiency and stability.
• Scalable perovskite solar modules (PSMs) face challenges in achieving high performance.

Purpose of the Study:

• To improve perovskite film morphology during blade-coating.
• To enhance the power conversion efficiency (PCE) and stability of PSCs and PSMs.
• To develop a method for fabricating high-performance, scalable perovskite solar devices.

Main Methods:

• Incorporating tailored ellipsoidal colloids into perovskite precursor solutions.
• Utilizing polymer additives to form these ellipsoidal colloids.
• Analyzing the packing behavior of ellipsoidal versus spherical colloids during blade-coating.

Main Results:

• Ellipsoidal colloids exhibited more oriented packing during blade-coating due to anisotropic fluidic forces.
• Improved film morphology led to higher PCEs: 24.31% for PSCs (0.09 cm²) and 21.67% for PSMs (13.94 cm²).
• Regulated PSMs maintained 89% of initial PCE after 600 hours of continuous operation.

Conclusions:

• Tailored ellipsoidal colloids offer a viable strategy to enhance perovskite film quality via blade-coating.
• This method significantly boosts the efficiency and operational stability of PSCs and scalable PSMs.
• The findings pave the way for efficient and stable large-area perovskite solar modules.