Application of organic semiconductors in amorphous selenium based photodetectors for high performance X-ray imaging

Shiva Abbaszadeh, Zhechen Du, Nicholas Allec, Karim S. Karim

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In order to improve the performance of amorphous selenium (a-Se) based detectors, it is beneficial to operate the device at high electric field (≥10 V/μm). Increasing the electric field reduces the ionization energy and increases the hole mobility within the a-Se detector. In order for a practical a-Se detector to be capable of working at a high electric field, injection of holes from the positively biased electrode and injection of electrons from the negatively biased electrode should be prevented. We have investigated different organic materials with high ionization potential as hole-blocking contacts for a-Se based photodetectors. The effect of the organic layer thickness on the dark current and photocurrent performance of the detector was examined. It was found that the injection of holes could be reduced at high electric fields by increasing the thickness of the organic layer.

Original languageEnglish (US)
Title of host publicationMedical Imaging 2013
Subtitle of host publicationPhysics of Medical Imaging
StatePublished - Jun 3 2013
EventMedical Imaging 2013: Physics of Medical Imaging - Lake Buena Vista, FL, United States
Duration: Feb 11 2013Feb 14 2013

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
ISSN (Print)1605-7422


OtherMedical Imaging 2013: Physics of Medical Imaging
Country/TerritoryUnited States
CityLake Buena Vista, FL


  • Amorphous selenium
  • Dark current
  • Indirect conversion X-ray imager
  • Large-area electronics
  • Organic semiconductors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging


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