Lateral Organic Semiconductor Photodetector: Effect of Electrode Spacing

We have studied the effect of electrode spacing in a bottom contact multilayer lateral metal-insulator-organic semiconductor-insulator-metal (MIOSIM) photodetector. Measured results show that the darkcurrent and photocurrent of the lateral MIOSIM photodetector are independent of the lateral spacing...

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Bibliographic Details
Published in:IEEE journal of selected topics in quantum electronics 2017-09, Vol.23 (5), p.1-7
Main Authors: Shafique, Umar, Karim, Karim S.
Format: Article
Language:English
Subjects:
Charge transport
Dark current
Detectors
Electrodes
Insulators
Lateral photoconductor
Multilayers
Organic semiconductors
Photoconductivity
photodetector
Photodetectors
Photoelectric effect
Photoelectric emission
Photometers
polystyrene
Polystyrene resins
Semiconductor device measurement
small molecule organic semiconductor
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Summary:We have studied the effect of electrode spacing in a bottom contact multilayer lateral metal-insulator-organic semiconductor-insulator-metal (MIOSIM) photodetector. Measured results show that the darkcurrent and photocurrent of the lateral MIOSIM photodetector are independent of the lateral spacing between the electrodes, which is in contrast to previously reported lateral organic photodetectors. Also, the ratio of darkcurrent and photocurrent remains constant for a range of optical illumination intensities and biasing voltages. We conclude that the conduction path for both the photocurrent and darkcurrent in the reported lateral MIOSIM photodetector is primarily due to vertical charge transport starting at the metal electrodes and reaching the organic semiconductor layer through a polystyrene (PS) intermediate interface layer.
ISSN:1077-260X
1558-4542
DOI:10.1109/JSTQE.2016.2641978