The role of metal/metal oxide/organic anode interfaces in efficiency and stability of bulk heterojunction organic photodetectors

Soultati, A., Georgiadou, D. G., Douvas, A., Argitis, P., Alexandropoulos, D., Vainos, N. A., Stathopoulos, N. A., Papadimitropoulos, G., Davazoglou, D. and Vasilopoulou, M. (2014) The role of metal/metal oxide/organic anode interfaces in efficiency and stability of bulk heterojunction organic photodetectors. Microelectronic Engineering, 117, 13-17. (doi:10.1016/j.mee.2013.12.008).

Abstract

We demonstrate a transition metal oxide based hole extraction layer approach to improve the efficiency, dark current and time stability of organic photodetectors (OPDs). A significant increase in device efficiency and over two orders of magnitude lower dark current at a bias voltage of -0.5 V were obtained in OPDs based on the poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C₇₁ butyric acid methyl ester (PC₇₁BM) bulk heterojunctions (BHJ). This was achieved by introducing an under-stoichiometric tungsten oxide layer, after optimizing its thickness to 10 nm, at the anode/organic layer interface instead of the commonly used poly(styrenesulfonate)-doped poly(ethylenedioxythiophene) (PEDOT:PSS). The increased efficiency and lower dark current were attributed to the formation of a favorable interfacial dipole and the reduction in the device series resistance, when PEDOT:PSS was replaced by these metal oxide layers.

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Contributors

Author: D. G. Georgiadou

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