High resolution x-ray image sensors based on HgI_2

摘要

Measurements of polycrystalline HgI_2 films on active matrix direct detection image sensors are described, for possible application to high sensitivity room temperature x-ray detection. The arrays exhibit low leakage current and very high sensitivity - roughly an order of magnitude better than has been demonstrated with other designs. The uniformity of the response varies randomly from pixel to pixel, for reasons that are not yet understood, but are probably related to the large grain size.