Flexible radiation dosimeters incorporating semiconducting polymer thick films
Mills, CA, Intaniwet, A, Shkunov, M, Keddie, JL and Sellin, PJ (2009) Flexible radiation dosimeters incorporating semiconducting polymer thick films In: Hard X-ray, gamma-ray, and neutron detector physics XI, 2009-08-03 - 2009-08-06, San Diego, USA.
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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).
|Item Type:||Conference or Workshop Item (Conference Paper)|
|Divisions :||Faculty of Engineering and Physical Sciences > Physics|
|Identification Number :||10.1117/12.829619|
|Additional Information :||Copyright 2009 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.|
|Depositing User :||Joseph Keddie|
|Date Deposited :||14 Dec 2012 14:10|
|Last Modified :||09 Jun 2014 13:25|
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