Record Stability for Fully Passive Perovskite‐Based X‐Ray Detectors Through the Use of Starch as Templating Agent

High sensitivity and efficient X-ray detectors are needed to promote boost their application as tools in medical diagnostics radiotherapy. Lead halide perovskites have emerged recently a novel class of material for detection. Although 3D possess very interesting optoelectronic properties they suffer from low environmental operational stability. Here strategy based on using starch polymeric template the fabrication stable thin film perovskite is reported. The proposed p-i-n photodiodes can operate with no external bias applied (fully passive devices), reaching top 5.5 ± 0.2 µC Gy−1 s−1. device degradation monitored samples stored air time window 630 days, demonstrating exceptional stability: 97% initial retained best perovskite-starch composite formulation making it most unencapsulated detector reported so far.