Enhancing Stability of Perovskite Solar Cells Towards Outdoor Operation

Organic-inorganic hybrid halide perovskites have attracted significant R&D attention in the photovoltaic (PV) community as a competitive technology for future PV applications. The certified efficiency of single-junction perovskite solar cell (PSC) has reached over 26%. The certified efficiency of perovskite-based tandem devices has reached over 34%. However, significant efforts are still needed to further understand the key factors or mechanisms limiting device stability and to develop corresponding strategies to enhance the stability of perovskite solar cells and modules for outdoor operation. In this talk, I will discuss our recent studies related to enhancing the stability of perovskite materials and solar cells. I will show the impact of a few key factors, including device stack optimization, surface defect passivation, and perovskite precursor impurity. These factors affect not only the device efficiency but also the device stability, especially at high operational temperatures. I will also discuss our recent progress toward understanding the link between indoor and outdoor PSC degradation behaviours. To push PSCs toward commercialization, it is critical to understand device reliability under real-world outdoor conditions where multiple stress factors (e.g., light, heat, humidity) coexist.