Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 44: Poster IV: Thin film photovoltaics; Organic electronics and photovoltaics (jointly with CPP, HL, O); Organic thin films; Trends in atomic layer deposition (Focused session)

DS 44.43: Poster

Freitag, 30. März 2012, 09:30–12:00, Poster E

Influence of chemical transformation on molecular orientation and surface texture of aluminium and gallium phthalocyanines thin films — •Florian Latteyer¹, Tamara Basova², Vitaly Kiselev³, Heiko Peisert¹, and Thomas Chassé¹ — ¹Universität Tübingen, IPTC, Auf der Morgenstelle 18, 72076 Tübingen, Germany. — ²Nikolaev Institute of Inorganic Chemistry SB RAS, 630090 Novosibirsk, Russia. — ³Institute of Chemical Kinetics and Combustion SB RAS, 630090 Novosibirsk, Russia.

The chemical transformation of aluminium and gallium phthalocyanines (AlClPc and GaClPc) in thin films to the mu-(oxo)dimers (PcAl)2O and (PcGa)2O has been investigated. IR, Raman, and XPS spectroscopies, as well as quantum chemical computations (DFT) were employed to study the structure of the films before and after annealing. It has been found that the annealing of AlClPc and GaClPc thin films in the presence of humidified nitrogen resulted in the formation of the corresponding mu-(oxo)dimers (PcAl)2O and (PcGa)2O. On the other hand, the annealing of the same films in the presence of oxygen led, beside to the formation of mu-(oxo)dimers, to a partial degradation and consequently to a parallel reaction. The structure changes of the thin films during annealing were studied using in situ Raman spectroscopy and AFM technique. Both, the initial AlClPc film and the obtained mu-(oxo)dimer (PcAl)2O film formed after annealing were disordered. At the same time, the molecules of the mu-(oxo)dimer (PcGa)2O formed out of GaClPc turned out to form a preferential standing orientation with respect to the substrate surface.