Organometal halide perovskite imager: a comparison 1.5 years after fabrication
conference paper
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 (MAPbI3) 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 MAPbI3 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 ~78% of the fresh one, which leads to a reduction of the sensitivity from around 1018 µC/(Gyaircm2) to 722 µC/(Gyaircm2). 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.
Topics
TNO Identifier
970994
ISSN
16057422
ISBN
9781510649378
Publisher
SPIE
Article nr.
120310J
Source title
Proceedings of SPIE
Editor(s)
Yu, W.
Zhao , L.
Zhao , L.
Files
To receive the publication files, please send an e-mail request to TNO Repository.