Halide perovskites: what makes them suitable for photovoltaics and what are their problems?
Walter R. L. Lambrecht
Department of Physics, Case Western Reserve University
The halide perovskites, in particular hybrid organic/inorganic lead based perovskites have attracted
great attention for solar cell applications. They are easy to fabricate and have high photo-electric conversion efficiencies but suffer from stability problems, the occurrence of competing structures, the presence of toxic lead. In this talk I will review some of the physical properties that make them attractive for solar cells and what makes them more broadly of interest from a physics of materials point of view. I will focus on their
electronic band structure features, phonons, excitonic binding energy and lattice distortion modes and
will describe progress toward lead-free halides.