Transient and local illumination of an organic photoconductive sensor

Wouter Woestenborghs; Patrick De Visschere; Filip Beunis; Arnout Vetsuypens; Kristiaan Neyts

doi:10.1117/12.2000502

6 March 2013 Transient and local illumination of an organic photoconductive sensor

Wouter Woestenborghs, Patrick De Visschere, Filip Beunis, Arnout Vetsuypens, Kristiaan Neyts

Proceedings Volume 8622, Organic Photonic Materials and Devices XV; 862216 (2013) https://doi.org/10.1117/12.2000502
Event: SPIE OPTO, 2013, San Francisco, California, United States

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 V_t. Linear regression performed on the I(V) curves below V_t 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 V_t. 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 V_t. For voltages above V_t 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<V_t. The space charge region is located near the cathode of the sensor.

Citation Download Citation

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

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