Large-area x-ray image sensing using a Pbl2 photoconductor

Robert A. Street; Kanai S. Shah; Steve E. Ready; Raj B. Apte; Paul R. Bennett; Misha Klugerman; Yuriy N. Dmitriyev

doi:10.1117/12.317027

24 July 1998 Large-area x-ray image sensing using a Pbl₂ photoconductor

Robert A. Street, Kanai S. Shah, Steve E. Ready, Raj B. Apte, Paul R. Bennett, Misha Klugerman, Yuriy N. Dmitriyev

Proceedings Volume 3336, Medical Imaging 1998: Physics of Medical Imaging; (1998) https://doi.org/10.1117/12.317027
Event: Medical Imaging '98, 1998, San Diego, CA, United States

Abstract

We report the fabrication and evaluation of a Pbl₂ imager using large area amorphous silicon technology. This approach uses a thick Pbl₂ x-ray photoconductor to absorb x-rays and collect ionization charge under the action of an applied field, while amorphous silicon thin film transistors (TFT) provide a matrix-addressed read out of the signal to external electronics. The x-ray sensitivity of Pbl₂ is high, and mobility-lifetime product is large enough to yield a high charge collection at low applied fields. The test arrays used to evaluate Pbl₂ have 256 X 256 pixels of size 200 microns. Each pixel contains an amorphous silicon switching transistor, gate and data addressing lines, a charge storage capacitor and a metal pad to contact the Pbl₂ layer. Early evaluation of the image sensor indicates the promise of Pbl₂ but indicates that reduction of the leakage current is important.

Citation Download Citation

Robert A. Street, Kanai S. Shah, Steve E. Ready, Raj B. Apte, Paul R. Bennett, Misha Klugerman, and Yuriy N. Dmitriyev "Large-area x-ray image sensing using a Pbl₂ photoconductor", Proc. SPIE 3336, Medical Imaging 1998: Physics of Medical Imaging, (24 July 1998); https://doi.org/10.1117/12.317027

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