Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 90: Poster III
HL 90.25: Poster
Donnerstag, 10. März 2016, 16:00–19:00, Poster A
Temperature Dependent Charge-Transfer-State Spectroscopy of Organic Solar Cells — •Clemens Göhler and Carsten Deibel — Institut für Physik, Technische Universität Chemnitz, 09126 Chemnitz, Germany
In nowadays often used bulk-heterojunction solar cells, the separation of excitons is aided by adding an acceptor material to the absorbing donor, forming an interfacial state at which charge transfer can take place. This charge-transfer or CT-state can be excited directly with sub-bandgap photons and serves as the main radiative recombination pathway when the solar cell is used as a light emitting diode.
By examining both effects via external quantum efficiency (EQE) and electroluminescence (EL) spectroscopy, one can learn more about the nature of charge-carrier separation and recombination in organic solar cells, which are considered main effects for the losses in the open-circuit voltage (Voc).
To contribute, we examine both the EQE and EL of organic solar cells with varying Voc as a function of the ambient temperature to reduce homogeneous broadening of the CT-absorption and emission lines. Thus, we have an access to the Marcus Theory’s molecular reorganization energy and their influence on the Voc-losses.