Publication date: 22nd July 2026
Metal halide perovskites exhibit a remarkable combination of defect tolerance, facile processing, and outstanding optoelectronic performance. These same attributes, however, may also underlie many of the phenomena that limit device stability. While unusual behavior in perovskite devices is often attributed broadly to ion migration, a growing body of evidence points to a more complex picture involving coupled ionic, electronic, and chemical processes.
In this talk, I will discuss halide phase separation as a model system for understanding the reactive nature of metal halide perovskites. I will describe how photoelectrochemical processes and interfacial reactions can drive compositional evolution in mixed-halide materials, and why controlling these processes is essential for realizing stable wide-bandgap perovskites for perovskite-silicon tandem solar cells.
I will highlight recent studies of interfacial redox chemistry, halide transport, and degradation pathways, and discuss how concepts from electrochemistry can complement conventional semiconductor device physics in understanding these materials. Finally, I will explore an open question for the field: whether the exceptional defect tolerance of halide perovskites is fundamentally linked to their propensity for photochemical reactivity. If so, understanding this relationship may prove central to the design of the next generation of stable perovskite optoelectronic devices.
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