Thickness uniformity and stability of amorphous selenium films on flexible substrates for indirect conversion x-ray detection

Maryam Farahmandzadeh, Steven Marcinko, Davide Curreli, Shiva Abbaszadeh

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

Abstract

Amorphous selenium (a-Se) possesses unique features that have been leveraged for medical imaging applications. Previously, it was shown that having a soft interface with a-Se will reduce the stress generated from the creation of crystalline nucleus, prevent radiation-induced crystallization, and improve long-term stability of the device. The aim of this study is to develop a uniform thickness of a-Se on a flexible substrate, polyethylene terephthalate coated with indium tin oxide (ITO-PET), for future investigations of the effect of substate on stability of the a-Se against radiation-induced defects and long-term storage. In order to fabricate the a-Se-based detector, we have developed a dedicated thermal evaporator for a-Se deposition. The dependence of the source-to-substrate distance on film uniformity has been investigated. Experimentally, following modeling results, a-Se samples over a 2-inch diameter were deposited on ITOPET and thickness uniformity was compared to simulation.

Original languageEnglish (US)
Title of host publicationMedical Imaging 2021
Subtitle of host publicationPhysics of Medical Imaging
EditorsHilde Bosmans, Wei Zhao, Lifeng Yu
PublisherSPIE
ISBN (Electronic)9781510640191
DOIs
StatePublished - 2021
EventMedical Imaging 2021: Physics of Medical Imaging - Virtual, Online, United States
Duration: Feb 15 2021Feb 19 2021

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume11595
ISSN (Print)1605-7422

Conference

ConferenceMedical Imaging 2021: Physics of Medical Imaging
Country/TerritoryUnited States
CityVirtual, Online
Period2/15/212/19/21

Keywords

  • Amorphous selenium
  • Crystallization
  • Flexible substrate
  • Indirect conversion
  • Photo-induced defects

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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