6 March 2013 Transient and local illumination of an organic photoconductive sensor
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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.
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Wouter Woestenborghs, Wouter Woestenborghs, Patrick De Visschere, Patrick De Visschere, Filip Beunis, Filip Beunis, Arnout Vetsuypens, Arnout Vetsuypens, Kristiaan Neyts, Kristiaan Neyts, "Transient and local illumination of an organic photoconductive sensor", Proc. SPIE 8622, Organic Photonic Materials and Devices XV, 862216 (6 March 2013); doi: 10.1117/12.2000502; https://doi.org/10.1117/12.2000502


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