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Squaraine-based organic photodetector coupled to a scintillating crystal for X-ray sensing applications

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9 Author(s)
Binda, M. ; Dipt. di Elettron. e Inf., Politec. di Milano, Milan, Italy ; Fiorini, C. ; Iacchetti, A. ; Natali, D.
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To the aim of developing an X-ray imager based on a scintillator coupled to an organic photodetector, we fabricated and tested a detector pixel whose active material is a blend of squaraine dyes and Phenyl-C61-Butyric-Acid-Methyl-Ester (PCBM), processed to obtain a detector thickness of 2¿m and a leakage current, at the operating voltage, below 10nA/cm2. The detector was coupled to a CsI(Tl) scintillator crystal obtaining, upon collimated 30keV x-ray beam, clear current signals of few hundreds of pA for a dose less than 5¿Gray/s, both in QCW and under 500¿s long pulses. In addition, the development of the pixel on a flexible and transparent substrate leads to a better scintillator light collection.

Published in:

Nuclear Science Symposium Conference Record (NSS/MIC), 2009 IEEE

Date of Conference:

Oct. 24 2009-Nov. 1 2009