Abstract
The analysis of supramolecular arrangement is essential to understand the role of this key factor on the optical and electrical properties of organic thin films. In this work, thin solid films of bis(phenethylimido) perylene (PhPTCD) fabricated using physical vapor deposition (PVD) technique (thermal evaporation), deposited simultaneously onto different substrates (Ag mirror, Ge, and quartz plates) contingent on the characterization technique. The main objective is to study the PhPTCD supramolecular arrangement and the thermal stability of this arrangement in PVD films. The ultraviolet-visible absorption reveals a controlled growth of the PVD films, and the micro-Raman scattering data show that the PhPTCD molecule is not thermally degraded in the conditions of these experiments. The microscopy also shows a homogeneous morphological surface of the PVD film at macro and micro scales, with molecular aggregates at nanoscale. Besides, the PVD film roughness does not follow substrate roughness. The X-ray diffraction indicates a crystalline structure for PhPTCD powder and an amorphous form for PhPTCD PVD film. The infrared absorption spectroscopy points to a preferential flat-on organization of the molecules in the PVD films. In addition, the annealing process (200 oC for 20 minutes) does not affect the supramolecular arrangement of the PhPTCD PVD films.
Highlights
Perylene derivatives have been object of extensive research[1] due to their unique optical properties well suited for theoretical and experimental studies[2,3] and their broad range of applications in organic devices such as organic solar cells (OSCs),[4] organic field effect transistors (OFETs),[5] organic light emitting diodes (OLEDs),[6] and sensors.[7]
It is observed that the Raman spectrum profile is the same for both samples, with no significant changes in their band center and relative intensity. It is concluded the PhPTCD molecule is not thermally degraded, which was expected since perylene derivatives are widely applied in film deposition through physical vapor deposition (PVD) technique.[19,20,21,22]
Figure SI 2: resonance Raman scattering (RRS) spectra for 150 nm PhPTCD PVD film deposited onto quartz substrate and onto Ag mirror substrate
Summary
Perylene derivatives have been object of extensive research[1] due to their unique optical properties well suited for theoretical and experimental studies[2,3] and their broad range of applications in organic devices such as organic solar cells (OSCs),[4] organic field effect transistors (OFETs),[5] organic light emitting diodes (OLEDs),[6] and sensors.[7]. The arrangements define the intermolecular distance between perylene macrocycles, strongly affecting properties such as charge transport,[3,8] excimer formation, and optical absorption and emission.[1,9] In particular, the physical vapor deposition (PVD) technique is known to promote supramolecular organization in thin solid films.[10,11,12,13,14,15] Here, we report a detailed spectroscopic characterization, including ultraviolet-visible (UV-Vis) absorption, Fourier transform infrared (FTIR) absorption, micro-Raman scattering, fluorescence, X-ray diffraction (XRD), and atomic
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
