Organometal halide perovskite imager: a comparison 1.5 years after fabrication

Future medical X-ray imaging will benefit from advances in computing power and artificial intelligence as well as improvements in the X-ray detector performance itself. Hybrid inorganic-organic perovskite materials promise direct conversion detectors with higher image quality, owing to their strong X-ray absorption, high electron and hole diffusion lengths with high charge carrier mobility and long carrier lifetime. A major obstacle to commercialization of perovskites like methylammonium lead triiodide (MAPbI(3)) is their stability and lifetime. In this article we want to show the great stability of our pixelated X-ray imaging detector after one year and a half of storage under ambient conditions. We compare these results to the previously reported ones, of the same detector, measured shortly after production. After more than a year, the MAPbI(3) detector shows comparable dark current, resolution of 5 line pairs (lp) mm(-1) and an equivalent linearity of the X-ray response over a dose range of two orders of magnitude. The X-ray response itself has been reduced to similar to 78% of the fresh one, which leads to a reduction of the sensitivity from around 1018 mu C/(Gy(air)cm(2)) to 722 mu C/(Gy(air)cm(2)). This indicates a degradation of the perovskite which lowers the extraction of the generated charges. Furthermore, we investigate the correlated dark current drift and electrical stability.