Amorphous selenium and its alloys from early xeroradiography to high resolution X‐ray image detectors and ultrasensitive imaging tubes

@article{Kasap2009AmorphousSA,
  title={Amorphous selenium and its alloys from early xeroradiography to high resolution X‐ray image detectors and ultrasensitive imaging tubes},
  author={Safa O. Kasap and Joel B. Frey and George Belev and Olivier Tousignant and Habib Mani and Luc Laperri{\`e}re and Alla Reznik and John A. Rowlands},
  journal={physica status solidi (b)},
  year={2009},
  volume={246}
}
We describe the progress in the science and technology of stabilized a‐Se from its early use in xerography and xeroradiography to its present use in commercial modern flat panel X‐ray imagers and ultrasensitive video tubes which utilize impact ionization of drifting holes. Both electrons and holes can drift in stabilized a‐Se, which is a distinct advantage since X‐ray photogeneration of charge carriers occurs throughout the bulk of the photoconductive layer. An a‐Se photoconductor has to be… 
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