The characteristic study of hybrid X-ray detector using ZnS phosphor

摘要

Photoconductor for direct detection flat-panel imager present a great materials challenge, since their requirements include high X-ray absorption, ionization and charge collection, low leakage current and large area deposition. Selenium is practical material. But it needs high thickness and high voltage in selenium for high ionization rate. We report comparative studies of amorphous selenium with phosphor of ZnS and without it. The leakage current of hybrid is similar to it of a-Se, but -photocurrent is lager than a-Se. Both of them have high spatial resolution, but hybrid has higher sensitivity than a-Se at comparable bias voltage.