Improving Operational Stability of High-Efficiency Inverted Perovskite Solar Cells

Kai Zhu National Renewable Energy Laboratory, Golden, CO, United States

We discuss three strategies to improve the efficiency and stability of the state-of-the-art inverted perovskite solar cells (PSCs), covering a wide range of bandgaps from 1.25 eV (narrow-bandgap) to 1.53 eV (mid-bandgap) to 1.75 eV (wide-bandgap). The three strategies include additive engineering, reactive surface treatment, and crystallization/growth control, with each one demonstrated for one bandgap. These approaches are effective at reducing defect densities, which is critical for improving device efficiency and operational stability. Finally, we discuss the importance of identifying a few selective stability testing protocols to enable rapid assessment of PSC technology advancement. Understanding operational stability at an elevated temperature is found most valuable to understand device operation under real-world conditions.