16.8% Monolithic all-perovskite triple-junction solar cells via a universal two-step solution process

Area of Science:

• Materials Science
• Renewable Energy
• Semiconductor Physics

Background:

• Perovskite semiconductors offer a promising avenue for high-efficiency, low-cost multijunction solar cells.
• Integrating diverse perovskite absorber layers in multijunction cells presents significant processing challenges due to design constraints and potential losses.

Purpose of the Study:

• To develop a versatile processing method for fabricating high-quality perovskite films with varying bandgaps.
• To achieve high power conversion efficiencies in monolithic all-perovskite tandem and triple-junction solar cells.

Main Methods:

• A versatile two-step solution process was employed to create 1.73 eV wide-, 1.57 eV mid-, and 1.23 eV narrow-bandgap perovskite films.
• Development of robust and low-resistivity interconnecting layers was crucial for device performance.

Main Results:

• Achieved power conversion efficiencies exceeding 19% for monolithic all-perovskite tandem solar cells.
• Demonstrated a power conversion efficiency of 16.8% for monolithic all-perovskite triple-junction solar cells utilizing 1.73 eV, 1.57 eV, and 1.23 eV perovskite sub-cells.
• Minimized potential energy and fill factor losses in the tandem devices.

Conclusions:

• The developed two-step solution process is effective for fabricating high-quality perovskite films for multijunction solar cells.
• The integration of robust interconnecting layers facilitates high-efficiency monolithic all-perovskite tandem and triple-junction solar cells.
• This advancement contributes to the development of cost-effective, high-performance solar energy solutions.