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Theoretical comparison among perovskite, Si and α-Se based x-ray detectors

In recent years, metal halide perovskite materials have received extensive attention due to their strong X-ray absorption capacity, high sensitivity, and low-cost preparation1 . In this work, cesium silver bismuth bromide (Cs2AgBiBr6) perovskite based detectors were simulated by using drift-diffusion equation in Silvaco. The X-ray energy spectrum was calculated according to the open-source TASMICS algorithm provided by J.H. Siewerdsen2 . The perovskite mass energy attenuation coefficients acquired from the NIST database3 were converted into imaginary parts of material refractive index. According to the simulation results, the average photo-current density of Cs2AgBiBr6 perovskite material is 10-9A/cm2 compared to Si (10-10A/cm2 ) and α-Se (1011/cm2 ). This is due to the relatively large atomic number of Cs2AgBiBr6 material and a high carrier mobility lifetime product. In addition, the Cs2AgBiBr6 photodetector exhibits a high photocurrent-to-dark current ratio (PDR) of 9700 than Si (51), while α-Se has the largest PDR value of 1.4301×105 . In summary, Both Cs2AgBiBr6 and α-Se can be used as the ideal direct X-ray detector materials.