Mercuric iodide polycrystalline films

Jan S. Iwanczyk; Bradley E. Patt; Carolyn R. Tull; Lawrence R. MacDonald; Nathan Skinner; Edward J. Hoffman; Laura Fornaro; Luis Mussio; Edgardo Saucedo; Alvaro Gancharov

doi:10.1117/12.450793

19 December 2001 Mercuric iodide polycrystalline films

Jan S. Iwanczyk, Bradley E. Patt, Carolyn R. Tull, Lawrence R. MacDonald, Nathan Skinner, Edward J. Hoffman, Laura Fornaro, Luis Mussio, Edgardo Saucedo, Alvaro Gancharov

Author Affiliations +

Proceedings Volume 4508, Penetrating Radiation Systems and Applications III; (2001) https://doi.org/10.1117/12.450793
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

Mercuric iodide (HgI₂) polycrystalline films are being developed as a new detector technology for digital x-ray imaging. Films have been grown with areas up to 80 cm² (4' diameter) and thickness of 20-250 micrometers using sublimation. The growth techniques used can be easily extended to produce much larger film areas (>10'x10'). Thickness of the grown layers and size of the grains can be regulated over a wide range by adjusting the growth parameters. The films were characterized with respect to their electrical properties and in response to ionizing radiation. Leakage current as low as 40 pA/cm² at the operating bias voltage of ~50 V has been observed. High sensitivity and excellent linearity in the response to x-rays was measured. Signals from these HgI₂ polycrystalline detectors, in response to ionizing radiation, compare favorably to the best published results for all high Z polycrystalline films grown elsewhere, including TlBr, PbI₂ and HgI₂. The low dark current, good sensitivity, and linearity of the response to x-rays put HgI₂ polycrystalline semiconductor detectors in position as a leading candidate material for use in digital x-ray imaging systems. Our future efforts will concentrate on optimization of film growth techniques specifically for deposition on a-Si:H flat panel readout arrays.

Citation Download Citation

Jan S. Iwanczyk, Bradley E. Patt, Carolyn R. Tull, Lawrence R. MacDonald, Nathan Skinner, Edward J. Hoffman, Laura Fornaro, Luis Mussio, Edgardo Saucedo, and Alvaro Gancharov "Mercuric iodide polycrystalline films", Proc. SPIE 4508, Penetrating Radiation Systems and Applications III, (19 December 2001); https://doi.org/10.1117/12.450793

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