Events
Organic Electronics Seminar
| Date: | Friday 9 May 2008 16:00 - 17:00 |
| Location: | Forrest Bar (Queen's Building) |
"Polymer based x-ray photodetectors for medical applications"
Panagiotis E. Keivanidis, J. C. Blakesley, I. A. Howard, R. Speller, N. C. Greenham, H. Sirringhaus, R. H. Friend Currently significant research is focused on incorporating conjugated polymers in devices such as photovoltaic cells and photodetectors. [1] We explored the possibility of using blend films of conjugated polymers with perylene diimides (PDIs) as the active elements of polymer-based x-ray photo detectors. In this context, we present results of photo diode performance at 530 nm with a maximum EQE530nm of ~16% for the F8BT:PDI pair. From radiation hardness experiments we demonstrate the stability of these photodiodes under x-ray exposure [2]. We show that the nature of side-chains attached on the PDI moiety affects the EQE of the devices and demonstrate the influence of film thickness on the photodiode metrics. Morphological studies help explaining the performance of these devices and a cross-linking technology allows for an all-solution based multilayer device fabrication protocol.
[1] Chen L. et al., Adv. Mater. 9999, 1 (2008); Yim K.-H. et al., Adv. Funct. Mater. 18, 1 (2008).
[2] Keivanidis E. P. et al., Appl. Phys. Lett. 92, 023304 (2008).
