oleksii semeniuk, along with co-authors published the paper “characterization of polycrystalline lead oxide for application in direct conversion x-ray detectors” in the nature scientific reports.
congratulations to oleksii semeniuk! great job!
abstract
while polycrystalline lead oxide (poly-pbo) is known to be one of the most promising photoconductors for utilization in x-ray detectors, its major performance parameters such as charge yield and mobility-lifetime product (μτ) are still not well established and require further investigation. combining the conventional x-ray induced photocurrent and pulse height spectroscopy techniques we examine the x-ray photogeneration and recombination processes in poly-pbo. the measurements indicate that the amount of energy required to release a single electron-hole pair w± (inverse of charge yield) strongly depends on the applied electric field and at 10 v/μm reaches ~20 ev/ehp. fitting the measured pulse height spectra with the hecht formula provided μτ for holes and electrons to be 4.1 × 10−8 cm2/v and 10−9 cm2/v, respectively. obtained μτ values combined with recently reported mobility values of charge carriers in pbo suggest a new direction towards an improvement of pbo technology by incorporation of frisch grid or x-ray transistor architectures.
continue reading the article: https://www.nature.com/articles/s41598-017-09168-3
