State of the art of the heavy metal iodides as photoconductors for digital imaging

Evaluation of Relationship between Grain Morphology and Growth Temperature of HgI2 Poly-Films for Direct Conversion X-ray Imaging Detectors

“…As shown in Figure 1f, the surface roughne the film gets better with the growth temperature arising, which is in favor of elect deposition, comparing the former two surface structures of the films grown. More portantly, the improvement of the orientation due to the increasing of depositing tem ature is favorable to the sensitivity of the detector [25]. Therefore, the present result tribute to (001) orientation of the film and formation of the uniform electrical field.…”

“…It is worth indicating that the growth of HgI 2 poly-film by PVD had the lowest source temperature, the lowest depositing temperature and the shortest period, compared with those of PbI 2 , BiI 3 , PbBr 2 , HgBr 2 , and HgBrI, which was thought for a future scale-up to larger areas [14]. Hence, the films have been grown with area from tens to hundreds cm 2 [21,22], and thickness from tens to 1800 µm [10,[23][24][25] by PVD for the application of imaging detectors.…”

“…Although the imaging effect was thought to match with the basic requirements of detectors, the texture of films for detectors approximates to that of the HgI 2 powder according to XRD pattern. Fornaro [25] claims that HgI 2 film matches readout matrix pixelation and is suitable for the needs of digital radiography when polycrystalline, while it yields maximum radiation absorption and appropriate surface for electrode deposition when oriented. Hence, the promising work is to choose a compromising process to meet both requirements above, considering our previous processes [12].…”

Zero-Dimensional Cs2TeI6 Perovskite: Solution-Processed Thick Films with High X-ray Sensitivity

“…However, to preserve the stability of TFT or CMOS devices, the film growth should be restricted to temperatures up to 200 °C. 16 α-Se can be easily evaporated onto a large area, making a dominated active matrix for X-ray imaging because of its low boiling point. But the detection efficiency is limited because of the lower atomic number (Z = 34), poor mobility-lifetime product (μτ), and relatively higher creation energy of electron−hole pair (E pair = 50 eV).…”

Textured α-HgI2 ceramics for sensitive X-ray detection

“…Direct conversion requires an insulating material with good photoconduction properties. Red mercury diodide, α-HgI 2 , has thus long been recognized as a material of choice for this application owing to its high X-ray absorption efficiency and its suitable electrical transport properties [3][4][5][6][7][8].…”