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

Starkenburg, Daken J.; Johns, Paul M.; Baciak, James E.; Nino, Juan C.; Xue, Jiangeng

doi:10.1063/1.4999759

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

Journal Article · Tue Dec 12 00:00:00 EST 2017 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4999759· OSTI ID:1414539

Starkenburg, Daken J. ^[1]; Johns, Paul M. ^[2]; Baciak, James E. ^[1]; Nino, Juan C. ^[1];

^[1]

Univ. of Florida, Gainesville, FL (United States)
Univ. of Florida, Gainesville, FL (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

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.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1414539

Report Number(s):: PNNL-SA-128920; WN0219080

Journal Information:: Journal of Applied Physics, Vol. 122, Issue 22; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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Light Detection in Open‐Circuit Voltage Mode of Organic Photodetectors Kielar, Marcin; Hamid, Tasnuva; Wiemer, Martin Advanced Functional Materials, Vol. 30, Issue 9 https://doi.org/10.1002/adfm.201907964	journal	December 2019
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