Dresden 2009 – scientific programme

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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 4: Organic Photovoltaics: from Single Molecules to Devices

SYOP 4.54: Poster

Thursday, March 26, 2009, 16:30–19:00, P1A

Reliable Electron-Only Devices and Electron Transport in n-type Polymers — •Robert Steyrleuthner, Sebastian Bange, and Dieter Neher — Universität Potsdam, Institut für Physik und Astronomie, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam

Charge transport properties of conjugated polymers have received increasing attention during the last years as a possibly limiting factor for solar cell performance. While hole transport properties have been extensively studied using single-carrier current-voltage measurements, only few reports can be found where this was applied to electron transport. Here, we summarize the experimental difficulties associated with electron-only single-carrier devices. The role of leakage currents and nonlinear differential resistance is discussed and the physical origin of these effects analyzed. We present a preparation technique for the metal electrodes which significantly improves the reliablity of electron-only devices. Using this method, electron transport was studied for two representative n-type polymers over a wide range of layer thickness and temperature. The results are explained in terms of established trapping models with exponential trap distribution.