Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 14: Organic photovoltaics and electronics - mostly cell design (with DS)

HL 14.7: Talk

Monday, March 16, 2015, 16:30–16:45, EW 202

Effective injection barriers of organic Schottky diodes — •Thorsten Arnold and Frank Ortmann — Institute for Materials Science and Dresden Center for Computational Material Science, TU Dresden, Germany

We describe electron transport through organic semiconductors connected to two metallic electrodes. The microscopic approach is based on a dynamic master-equation and Poisson equation describing the space charge potential. Disorder is modeled by a Gaussian site energy distribution. The current-voltage characteristic depends on the effective height of the injection barrier at the metal-semiconductor interface, which can be influenced by several effects, and the bulk properties.

The model is applied to a Schottky diode with different work functions of the electrodes. The influence of bulk and surface disorder on the rectification of the diode are analyzed for various temperatures. Furthermore, the influence of the space charge on the effective injection barrier height is investigated.