Publication date: 22nd July 2026
Since 2013, metal halide perovskites have been studied as a promising new material for X-ray detection in medical imaging. [1] Their use as thick layers (>100 µm) in direct X-ray detection devices could provide spatial resolution and sensitivity superiors to that of indirect scintillator-based detectors [1,2] and would allow for better medical diagnostic and reduced exposure dose for the patient. The all-inorganic CsPbBr3 perovskite demonstrates an average high atomic number, providing good X-ray absorption. Moreover, CsPbBr3 shows improved chemical stability compared to hybrid halides perovskites [3]. However, further insight into the physical and chemical properties of CsPbBr3 is still needed to improve device performance and reproducibility. In particular, unintentional extrinsic doping coming from the working atmosphere. To this end, thick layers of polycrystalline films obtained by Close Space Sublimation [4] were exposed to different atmospheric conditions in order to asses their influence on the detector performances.
Electrical properties such as dark and X-ray photo current were measured under both dry and humid atmosphere as well as in air and inert conditions. It was found that relative humidity is the main factor inducing changes in the material dark current (jdark) and device sensitivity. Most notably, jdark was found to increase up to a factor of 100 both in the absence (<0.5 %RH) or excessive presence (>50 %RH) of water. To obtain a deeper understanding of the chemical mechanism at play, steady state, time resolved photoluminescence and X-ray diffraction measurement under different humidity levels were carried out. We identified two separate mechanisms at the polycrystalline film surface observed below and above 50 % relative humidity.
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