Structural and morphological properties of N,N′-dimethyl-3,4,9,10-perylenetetracarboxylic diimide films on passivated GaAs(100) substrates

Electronic and Vibrational Spectroscopies Applied to Organic/Inorganic Interfaces

“…The crystallite size drastically increases with the temperature in the case of PTCDA deposited on Si(100) covered with natural oxide as well as in the case of hydrogen-passivated Si(100) substrates , and sulfur-passivated GaAs(100) substrates when varying the temperature from room temperature to 140 °C. The same trend was observed for DiMe-PTCDI films on S-GaAs(100) substrates . The organic layers decribed in this review were all prepared at room temperature, leading to polycrystalline but mostly homogeneous layers with the lowest degree of roughness observed on these inorganic semiconductor substrates.…”

“…First of all, Raman spectroscopy provides evidence for the crystalline nature of films through the presence of external molecular modes (phonons). Dedicated studies were already carried out for PTCDA crystals 52 and thin films 11,117 as well as on DiMe-PTCDI crystals and thin films. , The number and frequency positions of these phonons in films correspond to those detected in a single crystal (see section 2.3Vibrational Properties) for which XRD measurements proved a crystalline composition with monoclinic symmetry. Typical examples of phonon spectra of thin films are shown in Figure .…”

“…These characteristics correspond to the requirements for organic layers in organic-based electronic devices. Besides the conventional methods for the study of the crystalline nature of the films, such as X-ray diffraction, Raman spectroscopy was proven to provide valuable information as well. ,, …”

“…The same trend was observed for DiMe-PTCDI films on S-GaAs(100) substrates. 14 The organic layers decribed in this review were all prepared at room temperature, leading to polycrystalline but mostly homogeneous layers with the lowest degree of roughness observed on these inorganic semiconductor substrates. These characteristics correspond to the requirements for organic layers in organicbased electronic devices.…”

Weakly bound PTCDI and PTCDA dimers studied by using MP2 and DFT methods with dispersion correction

“…6,20,36 Studies on different derivatives of PTCDI or its bimolecular complexes are also abundant in the literature. 2,14,23,26,27,[37][38][39][40][41][42][43][44][45][46][47][48][49][50][51] Much less attention has been devoted to the binding interaction energy between PTCDI molecules, 13,15,16,44,[52][53][54] and, to the best of our knowledge, only the works of Fink and colleagues addressed systematically this issue. 53,54 The latter mentioned works focused on the packing and optical properties of PTCDI Scheme 1…”