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X-ray stability and response of polymeric photodiodes for imaging applications
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The x-ray stability of photodiodes made of poly(9,9-di--octylfluorene-co-benzothiadiazole):perylene diimide, poly[2,7-(9,9-di--octylfluorene)-co-(1,4-phenylene-[(4-sec-butylphenyl)imino]-1,4-phenylene)]:perylene diimide and poly(3-hexylthiophene):([6,6]-phenylC61-butyric acid methyl ester) (P3HT:PCBM) blends has been examined up to lifetime doses equivalent to those used in medicalx-ray digital imaging applications. Dark currents and external quantum efficiencies (EQEs) are not significantly affected after exposure to . Only in the case of P3HT:PCBM is a significant loss in EQE (17% of the initial value) observed. Possible reasons for the observed changes are proposed. When a scintillation layer is attached to the devices, a linear dependence of the photocurrent on the x-ray dose rate is observed for the three material systems.
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