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Proceedings Paper

Transient and local illumination of an organic photoconductive sensor
Author(s): Wouter Woestenborghs; Patrick De Visschere; Filip Beunis; Arnout Vetsuypens; Kristiaan Neyts
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Paper Abstract

In this paper we investigate the performance of a transparent photoconductive sensor based on a double layer of organic materials (m-MTDAB / PTCBI) which are deposited on two interdigitated transparent ITO electrodes. The performance of the sensor is demonstrated with electro-optical measurements: the I(V) curves consist of two linear sections meeting at a knee voltage Vt. Linear regression performed on the I(V) curves below Vt show that the conductance is a power law of the luminance incident on the device. We present a model to describe the behaviour of the sensor below Vt. We present measurements of I(t) for a transient illumination of the sensor. Plotting the inverse of the current as a function of time we find that the transient is consistent with the model for voltages below Vt. For voltages above Vt we find that the sensor behaves like a resistor in series with a space charge (SC) region. We present a local illumination experiment that confirms the existence of a SC region between the electrodes of the photoconductive sensor for V<Vt. The space charge region is located near the cathode of the sensor.

Paper Details

Date Published: 6 March 2013
PDF: 8 pages
Proc. SPIE 8622, Organic Photonic Materials and Devices XV, 862216 (6 March 2013); doi: 10.1117/12.2000502
Show Author Affiliations
Wouter Woestenborghs, Ghent Univ. (Belgium)
Patrick De Visschere, Ghent Univ. (Belgium)
Filip Beunis, Ghent Univ. (Belgium)
Arnout Vetsuypens, Barco N.V. (Belgium)
Kristiaan Neyts, Ghent Univ. (Belgium)


Published in SPIE Proceedings Vol. 8622:
Organic Photonic Materials and Devices XV
Christopher E. Tabor; François Kajzar; Toshikuni Kaino; Yasuhiro Koike, Editor(s)

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