 Lead halide perovskites have been identified as a promising material for x-ray detection due to their high sensitivity and efficiency. However, these materials are prone to degradation over time, which limits their use in applications such as medical imaging. A new approach has been developed by researchers at the University of Cambridge to address this issue. They use starch as a polymeric template to create a stable thin film perovskite x-ray detector. This approach resulted in a fully passive device with a top sensitivity of 5.5 μCGY-1S-1, which was found to be highly stable after being exposed to air for 630 days. This study represents a significant step forward in the development of lead halide perovskite x-ray detectors, as it provides a solution to the long-term stability issues associated with these materials. This article was authored by Matteo Verdi, Antonella Jury, Andrea Saivatti and others.