Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 58: Focus Session: Structure and Transport in Organic Photovoltaics III (jointly with CPP)
HL 58.4: Vortrag
Mittwoch, 28. März 2012, 15:45–16:00, ER 270
Phase separation in ternary charge-transfer-complexes — •Diana Nanova1,2, Sebastian Beck2, Milan Alt2, Tobias Glaser2, Annemarie Pucci2, Katrin Schultheiss1, Rasmus R. Schröder5, Jens Pflaum4, Wolfgang Kowalsky1,3, and Michael Kröger1,3 — 1Institute for High-Frequency Technology ,TU Braunschweig, Germany — 2Kirchhoff-Institute for Physics, U Heidelberg, Germany — 3Innovation Lab GmbH, Heidelberg, Germany — 4Institute for Experimental Physics VI, U Würzburg, Germany — 5BioQuant, U Heidelberg, Germany
We studied, how mixing of two organic charge-transfer-complexes, which are deposited via thermal co-evaporation at different concentrations by substituting only the acceptor molecules, allows tuning of the optical and structural properties in analogy to inorganic III-V semiconductor compounds. The electron diffraction patterns we collected on samples of a so called ternary CT-system DB-TTF/F4-TCNQx/TCNQ1-x do not show any indication of a mixed crystalline phase or novel crystalline order. However, upon mixing of the complexes the crystallinity of the individual phases degrades. This effect is correlating with mixing ratio. We performed x-ray-diffraction measurements, which confirm the phase separation in the ternary system. Further, we do not observe a shift or the appearance of new peaks in the infrared spectra. Hence, there is no electronic interaction in the presented ternary system between the CT-complexes. In summary this means, that in the ternary system, a phase-separated growth mode dominates and mixing of the phases is not achieved.