Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 72: Poster Session: Si-based Photovoltaics / Inorganic Photovoltaics / Structure and Transport in Organic Photovoltaics / Organic Semiconductors

HL 72.26: Poster

Mittwoch, 28. März 2012, 16:00–19:00, Poster D

Charge transport in organic semiconductors - electric potential mapping — •Johannes Widmer, Wolfgang Tress, Karl Leo, and Moritz Riede — Institute für Angewandte Photophysik, TU Dresden, Germany

The charge transport in thin films of organic semiconductors is characterized in single carrier devices of small molecule organic semiconductors. We observe space-charge limited currents (SCLC) in devices with varying layer thicknesses. This enables us to determine the electric field evolution within the material, i.e. we can characterize the charge current in more detail than in individual space-charge limited devices.

Single carrier devices allow for the characterization of current in the same geometry as in typical applications (in contrast to field effect transistors) and with adequate parameters: The current density, the electric field, as well as the charge carrier density in these measurements have similar values as in e.g. organic solar cells or OLEDs.

The presented evaluation method is an extension of single SCLC measurements and can give insight into device-relevant details of the charge transport.