Red mercuric iodide crystals obtained by isothermal solution evaporation: Characterization for mammographic X-ray imaging detectors

Crystal Growth of α-HgI2 by the Temperature Difference Method for High Sensitivity X-ray Detection

“…It should be mentioned that there is no appearance of K in the crystal in our measurement, indicating the absence of solvent inclusion in our sample. According to a previous report, owing to evaporation of surface evaporation on crystals, the calculated atom ratio of I/Hg from EDS is larger than a stoichiometric sample . And the atom ratio value from our EDS test is 2.164.…”

“…And the photo/dark current ratio is 102.7, demonstrating the detector’s significant response to X-ray. Despite the fact that the X-ray exposure (3.96 mR/min) employed is much less than that in X-ray mammographic energy range used in previous report, , the photo/dark current ratio of the detector (102.7) is much higher than previous reported values (13.5 15 and 25 18 ). The time-dependent photocurrent of the detector with 10 V bias under X-ray exposure of 3.96 mR/min is plotted in Figure c.…”

“…Previously reported solution growth methods of α-HgI 2 bulk crystals generally have employed a solvent evaporation (e.g., ethanol, dimethyl sulfoxide, CH 3 I, etc.) method. ,− However, the nonuniform evaporation rate may induce pores and stress defects into the growing α-HgI 2 crystal, which are unfavorable for the practical use of the crystal.…”

Coplanar-grid electrode design of HgI2 detector by finite elements simulation

“…Single-crystal HgI 2 detectors have demonstrated excellent energy resolution and detection efficiency, and the performance of polycrystalline film has been approaching that of single-crystal over the last few years [8][9][10]. Because of the lower fabrication cost for large area detectors and the more practical experiences gained with HgI 2 materials in space and commercial applications, polycrystalline α-HgI 2 films are thought to be one of the promising direct converters in X-ray digital radiography [11][12][13][14][15][16].…”