Comparative study of Pbl2 and Hgl2 as direct detector materials for high-resolution x-ray image sensors

Robert A. Street; Marcelo Mulato; Michael M. Schieber; Haim Hermon; Kanai S. Shah; Paul R. Bennett; Yuri Dmitryev; Jackson Ho; Rachel Lau; Evgenie Meerson; Steve E. Ready; Benjamin Reisman; Y. Sado; Koenraad Van Schuylenbergh; Alexander I. Vilensky; Asaf Zuck

doi:10.1117/12.430858

28 June 2001 Comparative study of Pbl₂ and Hgl₂ as direct detector materials for high-resolution x-ray image sensors

Robert A. Street, Marcelo Mulato, Michael M. Schieber, Haim Hermon, Kanai S. Shah, Paul R. Bennett, Yuri Dmitryev, Jackson Ho, Rachel Lau, Evgenie Meerson, Steve E. Ready, Benjamin Reisman, Y. Sado, Koenraad Van Schuylenbergh, Alexander I. Vilensky, Asaf Zuck

Author Affiliations +

Proceedings Volume 4320, Medical Imaging 2001: Physics of Medical Imaging; (2001) https://doi.org/10.1117/12.430858
Event: Medical Imaging 2001, 2001, San Diego, CA, United States

Abstract

X-ray imaging properties are reported for HgI₂ and PbI₂, as candidate materials for future direct detection x- ray image sensors, including the first results from screen- printed HgI₂ arrays. The leakage current of PbI₂ is reduced by using new deposition conditions, but is still larger than HgI₂. Both HgI₂ and PbI₂ have high spatial resolution but new data shows that the residual image spreading of PbI₂ is not due to k-edge fluorescence and its possible origin is discussed. HgI₂ has substantially higher sensitivity than PbI₂ at comparable bias voltages, and we discuss the various loss mechanisms. Unlike PbI₂, HgI₂ shows a substantial spatially non-uniform response that is believed to originate from the large grain size, which is comparable to the pixel size. We obtain zero spatial frequency DQE values of 0.7 - 0.8 with PbI(subscript 24/ under low energy exposure conditions. A model for signal generation in terms of the semiconducting properties of the materials is presented.

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Robert A. Street, Marcelo Mulato, Michael M. Schieber, Haim Hermon, Kanai S. Shah, Paul R. Bennett, Yuri Dmitryev, Jackson Ho, Rachel Lau, Evgenie Meerson, Steve E. Ready, Benjamin Reisman, Y. Sado, Koenraad Van Schuylenbergh, Alexander I. Vilensky, and Asaf Zuck "Comparative study of Pbl₂ and Hgl₂ as direct detector materials for high-resolution x-ray image sensors", Proc. SPIE 4320, Medical Imaging 2001: Physics of Medical Imaging, (28 June 2001); https://doi.org/10.1117/12.430858

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