Hybrid halide perovskites combine ease of preparation and relatively abundant constituent
elements with fascinating photophysical properties. Descriptions of the chemical and
structural drivers of the remarkable properties have often focused on the potential role of the
dynamic order/disorder of the molecular A-site cations. We reveal here a key aspect of the
inorganic framework that potentially impacts the electronic, thermal, and dielectric
properties. The temperature evolution of the X-ray pair distribution functions of hybrid …