1. Organic semiconductor photosensors.
- Author
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Ocaya, R.O., Al-Sehemi, Abdullah G., Al-Ghamdi, Ahmed, El-Tantawy, Farid, and Yakuphanoglu, F.
- Subjects
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PHOTODETECTORS , *ORGANIC semiconductors , *COUMARINS , *DOPED semiconductors , *POLYTHIOPHENES , *PHOTODIODES - Abstract
Coumarin doped with poly(3-hexylthiophene)/p-Si photodiodes were prepared by the drop-casting technique. The current–voltage characteristics of the prepared diodes with the structure of Al/P3HT:Coumarin/p-Si/Al diodes were investigated under dark and various illumination intensities using both I–V and C–V methods. Using both illuminated DC and transient I–V and C–V measurements, the photocurrents are shown to depend on light intensity with the P3HT:Coumarin ratio influencing photoresponsivity. The photocurrents increase with increasing illumination intensity. C–V measurements show that the capacitance of the diode depends on voltage, frequency and illumination, indicating the existence of a continuous distribution of interface states that can be described in terms of organic-organic polymer blend domains in additional to the well studied metal-semiconductor interface states. The best responses were found to be for the diode having 10% Coumarin weight. These results suggest that the Al-p-Si/P3HT:Coumarin/Al diode can be used as a photosensor. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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