17 September 2009 Flexible radiation dosimeters incorporating semiconducting polymer thick films
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Abstract
Flexible radiation dosimeters have been produced incorporating thick films (>1 μm) of the semiconducting polymer poly([9,9-dioctylfluorenyl-2,7-diyl]-co-bithiophene). Diode structures produced on aluminium-metallised poly(imide) substrates, and with gold top contacts, have been examined with respect to their electrical properties. The results suggest that a Schottky conduction mechanism occurs in the reverse biased diode, with a barrier to charge injection at the aluminium electrode. Optical absorption/emission spectra reveal a band gap of 2.48 eV for the polymer. The diodes have been used for direct charge detection of 17 keV X-rays, generated by a molybdenum source. Using operating voltages of -10 and -50 V respectively, sensitivities of 54 and 158 nC/mGy/cm3 have been achieved. Increasing the operating voltage shows that the diodes are stable up to approximately -200 V without significant increase in the dark current of the device (<0.2 nA).
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Christopher A. Mills, Christopher A. Mills, Akarin Intaniwet, Akarin Intaniwet, Maxim Shkunov, Maxim Shkunov, Joseph L. Keddie, Joseph L. Keddie, Paul J. Sellin, Paul J. Sellin, } "Flexible radiation dosimeters incorporating semiconducting polymer thick films", Proc. SPIE 7449, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XI, 74491I (17 September 2009); doi: 10.1117/12.829619; https://doi.org/10.1117/12.829619
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