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
DOI
https://dx.doi.org/10.1117/12.2610586
ISSN
16057422
ISBN
9781510649378
Publisher
SPIE
Article nr.
120310J
Source title
Proceedings of SPIE
Editor(s)
Yu, W.
Zhao , L.
Zhao , L.
Files
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