Journal
APPLIED PHYSICS LETTERS
Volume 93, Issue 20, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3028640
Keywords
diagnostic radiography; fullerenes; organic semiconductors; phosphors; photodetectors; polymers
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Funding
- EPSRC's Next Generation Electrophotonics programme [EP/C540336]
- MIUR [FIRB RBNE033KMA]
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Organic photodetectors for use in medical x-ray digital imaging applications are fabricated from poly(3-hexylthiophene) and [6,6]-phenyl C-61-butyric acid methyl ester using a solution-based, temperature assisted deposition protocol. In comparison to bulk heterojunction structures, the proposed protocol leads to much lower dark currents while still offering useful external quantum efficiency values. Devices made by this protocol lead to dark currents of around 50 pA/cm(2) at -0.8 V, well within the requirements for x-ray digital imaging. When coupled to a scintillating phosphor screen the device yields a linear response of photocurrent to x-ray exposure (from 0 to 7mGy/s) for a range of operating biases.
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