Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 57: Organic Photovoltaics and Electronics II (joined session with CPP)

HL 57.3: Vortrag

Mittwoch, 22. März 2017, 15:15–15:30, POT 81

Revealing the loss mechanisms in ZnO/organic hybrid solar cells — •Moritz Eyer¹, Sebastian Kickhöfel², Johannes Frisch², Sergey Sadofev¹, Joachim Puls¹, Norbert Koch¹, Emil List-Kratochvil², and Sylke Blumstengel² — ¹Institut für Physik, Humboldt-Universität zu Berlin — ²Inst. f. Physik, Inst. f. Chemie und IRIS Adlershof, Humboldt-Universität zu Berlin

In order to study the losses of ZnO/organic hybrid photovoltaic devices a model system of ZnMgO and poly(3-hexylthiophene) (P3HT) is introduced. It allows tuning the interface band gap energy between the ZnMgO conduction band minimum and the P3HT HOMO systematically by varying the Mg content in the inorganic component. This enables a profound study of charge separation and recombination processes at the interface of inorganic/organic hybrid heterojunctions.

Prior to full charge separation electron and hole on opposite sides of the interface form hybrid charge transfer excitons (HCTX) bound by Coulomb interaction [1]. Electroluminescence measurements in the near IR spectral range confirm the existence of HCTX and yield valuable information of their physical properties. Temperature dependent photovoltaic measurements provide the necessary information to understand the charge separation process and its influence on the parameters defining the performance of a photovoltaic device. A detailed study of the interface energetics allows quantifying the recombination losses of inorganic/organic hybrid heterojunctions in order to fully exploit their potential in solar energy.

[1] M. Eyer et. al. Appl. Phys. Lett. 107, 221602 (2015).