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HL: Fachverband Halbleiterphysik

HL 64: Poster: Photovoltaics and Optics

HL 64.14: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P1C

Determination of electronic trap states in polymer based diodes and their impact on the charge carrier mobility — •Michael Bretschneider, Alexander Wagenpfahl, and Carsten Deibel — Institut für Physik, Technische Universität Chemnitz, 09126 Chemnitz, Germany

Aiming for more efficient organic electronic devices, one has to understand the limiting factors in terms of charge transport and recombination, which are often related to trap states. We characterise and quantify the energetic distribution of charge carrier traps of a PCDTBT diode by fractional thermally stimulated current measurements. We find that the density of occupied states shows an approximately Gaussian shape, which is often expected for disordered organic semiconductors. Time of flight measurements are used to determine the electron and hole mobility, respectively. We investigate the correlation of the charge carrier mobility with the trap distribution and discuss the impact on the device performance.