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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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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).

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Mills, CAUNSPECIFIEDUNSPECIFIED
Intaniwet, AUNSPECIFIEDUNSPECIFIED
Shkunov, MUNSPECIFIEDUNSPECIFIED
Keddie, JLUNSPECIFIEDUNSPECIFIED
Sellin, PJUNSPECIFIEDUNSPECIFIED
Date : 2009
Identification Number : 10.1117/12.829619
Contributors :
ContributionNameEmailORCID
PublisherSPIE, UNSPECIFIEDUNSPECIFIED
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
URI: http://epubs.surrey.ac.uk/id/eprint/736487

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