Polymorphism in phthalocyanine thin films: mechanism of the alpha-->beta transition

Article Abstract:

Two different polymorphic forms of free base phthalocyanine films are grown on glass substrates by ultrahigh vacuum organic molecular beam deposition and postgrowth annealing of films grown at room temperature leads to transformation from the alpha to the beta1 phase. Detailed morphological studies indicate that the transition occurs via a discrete number of nucleations and is preceded by an elongation of the alpha crystallites.

Industrial Organic Chemicals, Cyclic Crude and Intermediate Manufacturing, Phthalocyanine, Molecular dynamics, Phthalocyanins, Polymorphism (Crystallography), Chemical properties

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Charge recombination in CuPc/PTCDA thin films

Article Abstract:

Transient absorption spectroscopy is used to study the recombination kinetics of photogenerated charge carriers in perylene-3, 4, 9, 10-tetracarboxylic dianhydride (PTCDA) and copper phthalocyanine (CuPc) thin films grown by organic molecular beam deposition. The recombination behavior is similar to the observed polymer/fullerene blends, which suggests a generic to a range of semiconducting materials.

Semiconductors and related devices, Semiconductor and Related Device Manufacturing, Thin Film Materials, Analysis, Thin films, Dielectric films, Absorption spectra, Fullerenes

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Raman scattering as a probe of crystallinity in PTCDA and H2Pc single layer and double layer thin film heterostructures

Article Abstract:

The structural properties of molecular thin films with poryphyrins are examined. The Raman spectroscopy applied for this purpose is explained.

Optical properties, Monomolecular films, Raman spectroscopy, Optics, Optical research

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