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Title: Thin film organic photodetectors for indirect X-ray detection demonstrating low dose rate sensitivity at low voltage operation

Abstract

Here, developments in the field of organic semiconductors have generated organic photodetectors with high quantum efficiency, wide spectral sensitivity, low power consumption, and unique form factors that are flexible and conformable to their substrate shape. In this work, organic photodetectors coupled with inorganic CsI(Tl) scintillators are used to showcase the low dose rate sensitivity that is enabled when high performance organic photodetectors and scintillator crystals are integrated. The detection capability of these organic-inorganic coupled systems to high energy radiation highlights their potential as an alternative to traditional photomultiplier tubes for nuclear spectroscopy applications. When exposed to Bremsstrahlung radiation produced from an X-ray generator, SubPc:C60, AlPcCl:C70, and P3HT:PC61BM thin film photodetectors with active layer thicknesses less than 100 nm show detection of incident radiation at low and no applied bias. Remarkably low dose rates, down to at least 0.28 µGy/s, were detectable with a characteristic linear relationship between exposure rate and photodetector current output. These devices also demonstrate sensitivities as high as 5.37 mC Gy-1 cm-2 when coupled to CsI(Tl). Additionally, as the tube voltage across the X-ray generator was varied, these organic-inorganic systems showed their ability to detect a range of continuous radiation spectra spanning several hundred keV.

Authors:
 [1];  [2];  [1];  [1]; ORCiD logo [1]
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  1. Univ. of Florida, Gainesville, FL (United States)
  2. Univ. of Florida, Gainesville, FL (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1414539
Report Number(s):
PNNL-SA-128920
Journal ID: ISSN 0021-8979; WN0219080
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 122; Journal Issue: 22; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Starkenburg, Daken J., Johns, Paul M., Baciak, James E., Nino, Juan C., and Xue, Jiangeng. Thin film organic photodetectors for indirect X-ray detection demonstrating low dose rate sensitivity at low voltage operation. United States: N. p., 2017. Web. doi:10.1063/1.4999759.
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Starkenburg, Daken J., Johns, Paul M., Baciak, James E., Nino, Juan C., & Xue, Jiangeng. Thin film organic photodetectors for indirect X-ray detection demonstrating low dose rate sensitivity at low voltage operation. United States. https://doi.org/10.1063/1.4999759
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Starkenburg, Daken J., Johns, Paul M., Baciak, James E., Nino, Juan C., and Xue, Jiangeng. Tue . "Thin film organic photodetectors for indirect X-ray detection demonstrating low dose rate sensitivity at low voltage operation". United States. https://doi.org/10.1063/1.4999759. https://www.osti.gov/servlets/purl/1414539.
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@article{osti_1414539,
title = {Thin film organic photodetectors for indirect X-ray detection demonstrating low dose rate sensitivity at low voltage operation},
author = {Starkenburg, Daken J. and Johns, Paul M. and Baciak, James E. and Nino, Juan C. and Xue, Jiangeng},
abstractNote = {Here, developments in the field of organic semiconductors have generated organic photodetectors with high quantum efficiency, wide spectral sensitivity, low power consumption, and unique form factors that are flexible and conformable to their substrate shape. In this work, organic photodetectors coupled with inorganic CsI(Tl) scintillators are used to showcase the low dose rate sensitivity that is enabled when high performance organic photodetectors and scintillator crystals are integrated. The detection capability of these organic-inorganic coupled systems to high energy radiation highlights their potential as an alternative to traditional photomultiplier tubes for nuclear spectroscopy applications. When exposed to Bremsstrahlung radiation produced from an X-ray generator, SubPc:C60, AlPcCl:C70, and P3HT:PC61BM thin film photodetectors with active layer thicknesses less than 100 nm show detection of incident radiation at low and no applied bias. Remarkably low dose rates, down to at least 0.28 µGy/s, were detectable with a characteristic linear relationship between exposure rate and photodetector current output. These devices also demonstrate sensitivities as high as 5.37 mC Gy-1 cm-2 when coupled to CsI(Tl). Additionally, as the tube voltage across the X-ray generator was varied, these organic-inorganic systems showed their ability to detect a range of continuous radiation spectra spanning several hundred keV.},
doi = {10.1063/1.4999759},
journal = {Journal of Applied Physics},
number = 22,
volume = 122,
place = {United States},
year = {2017},
month = {12}
}
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https://doi.org/10.1063/1.4999759
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