UC San Diego

In recent years, hybrid halide perovskite solar cells have attracted much attention due to their excellent optoelectronic performance. Leveraging the structural flexibility of perovskites, composition engineering appears to be an effective approach to improve material and device stability but can also raise durability challenges such as phase separation. In this presentation, I will share insights into the composition-performance relationships in these emerging materials resulting from correlative X-ray, electron, and optical microscopy investigations. Encompassing a wide range of perovskite chemistries, this work reveals the challenges and benefits of increasing compositional complexity and elucidates the roles of substituents and additives in these complex material systems. By identifying potential pitfalls in tuning the materials chemistry of halide perovskites, we provide a path forward for further improving their optoelectronic performance and making them commercially viable.