Berlin 2018 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 45: Organic photovoltaics and electronics
HL 45.9: Vortrag
Donnerstag, 15. März 2018, 17:15–17:30, EW 203
Understanding the Capacitance Voltage Characteristics of Organic Light Emitting Diodes by Combining Photoelectron Spectroscopy, Impedance Spectroscopy and Current Voltage Measurements — •Victoria Wißdorf1,2, Paula Connor2, Maybritt Kühn2,3, Christof Pflumm1, Wolfram Jaegermann2,3, and Eric Mankel2,3 — 1Merck KGaA, Darmstadt — 2Technische Universität Darmstadt, Darmstadt — 3InnovationLab GmbH, Heidelberg
The determination of reliable material parameters, such as the mobility or injection barrier of charge carriers in organic semiconducting materials, is a crucial step towards an advanced understanding of the physical processes that determine the performance of Organic Light Emitting Diodes (OLEDs). This determination is by far means not trivial: It highly depends on the theoretical model assumed, the measurement technique used and the device that is evaluated. Within this study we present a drift-diffusion approach based on [1] that can be correlated with the photoelectron spectroscopy measurements of hole transport materials and their corresponding Hole-Only-Device (HOD) characteristics for current voltage and impedance spectroscopy (capacitance voltage) measurements. Based on the doping model presented in [2] we can explain how the Capacitance Voltage curves of HODs are influenced by the p-doping of the organic semiconductor.
[1] Kühn et al., Organic Electronics 37, 336-345, (2016)
[2] Mayer et al., Organic Electronics 13, 1356-1364, (2012)