Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 42: Organic Electronics and Photovoltaics I (Joint session of CPP, DS, HL and O, organized by CPP)
HL 42.4: Vortrag
Dienstag, 8. März 2016, 14:45–15:00, H37
Direct visualization of charge-extraction in metal-mesh based OPV cells by light-biased LBIC — •Mathias Gruber1,2, Arne Hendel1, Vladislav Jovanov1, Manfred J. Walter2, and Veit Wagner1 — 1Department of Physics and Earth Sciences, Jacobs University Bremen, 28759 Bremen, Germany — 2PolyIC GmbH & Co. KG, 90763 Fürth, Germany
Metal-mesh based electrode systems are a highly conductive, versatile and unexpensive alternative to ITO-electrodes for organic photovoltaic (OPV) cells. However, as a metal-mesh does not offer full surface conductivity it is usually combined with a less conductive PEDOT:PSS layer, which enables lateral charge-transport in the area in between the metal tracks. The sheet conductivity of this additional lateral conductive layer (LCL) needs to be carefully tuned with respect to the distance of the metal tracks to reduce short circuit current (Jsc) losses and additional series resistance due to resistive losses in the LCL material. Usually this is done via electrical simulation or via analysis of IV-measurements of a large number of devices with different LCL sheet conductivities. Here we present a direct way to measure the current collection losses due to PEDOT:PSS sheet resistance by integrating a white light-bias into a LBIC measurement (Light-bias LBIC). We show that we are not only able to directly measure and visualize charge extraction under real device operation conditions but are also able to determine the intrinsic PEDOT:PSS sheet resistance in the operating OPV device.