Performance Analysis of Perovskite and Quaternary Compound for X-ray Image Detectors

Abstract

Photoconductor layer plays a vital role to obtain a better image form a direct conversion X-ray image detector for medical diagnosis. The performance of an X-ray imaging system depends mostly on the sensitivity and the modulation transfer function (MTF). This paper evaluates the performance of a perovskite (Cs ₂ AgBiBr ₆ ) and a quaternary compound (TlHgInS ₃ ) in comparison to amorphous Selenium ( α-Se) currently being used as a photoconductor in X-ray image detectors. Both materials have higher linear attenuation coefficient compared to a-Se. The calculated sensitivity is found to be much better than a-Se at the applied electric field. The resolution of the X-ray image detector in terms of MTF is also investigated in this paper. The MTF results show that Cs ₂ AgBiBr ₆ based detector has better resolution than a-Se while TlHgInS ₃ has worse resolution than a-Se. Based on the theoretical calculations shown in this study, it is expected both Cs ₂ AgBiBr ₆ and TlHgInS ₃ will be useful for X-ray imaging system if more researches are conducted to improve their mobility-lifetime products.