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Proceedings Paper

Flexible radiation dosimeters incorporating semiconducting polymer thick films
Author(s): Christopher A. Mills; Akarin Intaniwet; Maxim Shkunov; Joseph L. Keddie; Paul J. Sellin
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Paper 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).

Paper Details

Date Published: 17 September 2009
PDF: 7 pages
Proc. SPIE 7449, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XI, 74491I (17 September 2009); doi: 10.1117/12.829619
Show Author Affiliations
Christopher A. Mills, Univ. of Surrey (United Kingdom)
Akarin Intaniwet, Univ. of Surrey (United Kingdom)
Maxim Shkunov, Univ. of Surrey (United Kingdom)
Joseph L. Keddie, Univ. of Surrey (United Kingdom)
Paul J. Sellin, Univ. of Surrey (United Kingdom)


Published in SPIE Proceedings Vol. 7449:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XI
Ralph B. James; Larry A. Franks; Arnold Burger, Editor(s)

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