SEMINAR

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 26%. Using molecules/structures based on bulky organic cations (e.g., butylammonium or phenethylammonium) to improve the surface/interface properties has become a promising strategy to enhance PSC performance, including both efficiency and stability. In this talk, I will discuss our recent studies on perovskite surface engineering to improve device stability under operational conditions. I will present strategies for suppressing defect formation, improving bulk and surface morphology, and reducing transport barrier for better extraction. The physical and optoelectronic properties of perovskites can be affected by controlling the precursor chemistry and growth conditions. In addition, I will 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. Understanding the link between lab and field behaviors is necessary to help identify accelerated lab testing protocols to quickly guide PSC development.