Journal
APPLIED PHYSICS LETTERS
Volume 105, Issue 16, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4898000
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Funding
- LA-i6 Proof of Concept Center through DOC [08-79-04731]
- Louisiana Space Consortium LaSPACE/NASA Graduate Student Research Assistance GSRA program [NNX10AI40H]
- NASA [131640, NNX10AI40H] Funding Source: Federal RePORTER
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Substantial broadband photoconductive gain has been realized for organic, thin-film photodetectors with a poly(3-hexylthiophene): phenyl-C-61-butyric-acid-methyl-ester (P3HT: PCBM) active layer at low bias voltages. External quantum efficiencies upwards of 1500% were achieved when a semicontinuous gold layer was introduced at the anode interface. Significant gain was also observed in the sub-band gap, near infrared region where the external quantum efficiency approached 100% despite the lack of a sensitizer. The gain response was highly dependent on the thickness of the active layer of the photodetector with the best results achieved with the thinnest devices. The gain is the result of the injection of secondary electrons due to hole charge trapping at the semicontinuous gold layer. (C) 2014 AIP Publishing LLC.
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