Synergistic Redox Modulation for High-Performance Nickel Oxide-Based Inverted Perovskite Solar Modules

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Nickel oxide (NiO_x)-based inverted perovskite solar cells offer stability and cost-effectiveness for perovskite photovoltaics.
• Interfacial reactions and iodide oxidation degrade NiO_x-based perovskite solar cell performance and reproducibility.

Purpose of the Study:

• To introduce potassium borohydride (KBH₄) as a dual-action reductant to improve NiO_x-based perovskite solar cells.
• To mitigate interfacial redox reactions and iodide oxidation in perovskite films.

Main Methods:

• Introduction of potassium borohydride (KBH₄) as a reductant.
• Synergistic redox modulation to suppress nonradiative recombination and increase carrier lifetime.
• Fabrication and testing of NiO_x-based perovskite solar cells and modules.

Main Results:

• Achieved a 24.17% power conversion efficiency for NiO_x-based perovskite solar cells.
• Reached a record 20.2% efficiency for NiO_x-based perovskite solar modules fabricated in ambient conditions.
• Modules retained 94% of initial efficiency after 2000 hours of continuous illumination at 65°C.

Conclusions:

• Potassium borohydride effectively prevents Ni⁴⁺/perovskite interface reactions and iodide oxidation.
• The dual-action reductant significantly enhances the performance and stability of NiO_x-based perovskite photovoltaics.
• Demonstrated a viable strategy for commercializing stable and efficient perovskite solar technology.