Optical Spectroscopy of Tetraphenyl Poryphyrin Oligomier Flms

• Applicant: Dr. Simona Dorina Pop
• Subject Area: Physical Chemistry of Molecules, Liquids and Interfaces, Biophysical Chemistry
• Term: from 2009 to 2015
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 134676295

• Final Report Year: 2014

Final Report Abstract

In the case of the porphyrin monomers, the tunable character of the optical constants is revealed by modifying the core substituents. The newly determined optical constants can be used in designing and optimizing the optoelectronic devices, particularly photovoltaics, based on porphyrin films. It was found for the first time that the thermally grown porphyrin films are not stable in the air. The aging induces aggregates formation reflected by optical anisotropy. This type of structural change has a direct impact on the device performance; therefore the aging of porphyrin films should be avoided. The decomposition of the porphyrin dimers during the thermal evaporation in vacuum was not expected to arise. Theoretically, they were supposed to be chemically stable.

Publications

• Aging-induced optical anisotropy in thermally grown thin ZnTPP films on Si. physica status solidi (b) Volume: 250 Issue: 9, 1791-1794
  Kate, Stephan Peter; Pop, Simona; Esser, Norbert; et al.
  
• Organic Materials for Optoelectronic Applications. In: Ellipsometry of Functional Organic Surfaces and Films Volume: 52 Pages: 347-356. 2014
  Furchner, Andreas; Aulich, Dennis
  
• Tunable optical constants of thermally grown thin porphyrin films on silicon for photovoltaic applications. Solar Energy Materials and Solar Cells Volume: 127, 169-173
  Pop, Simona D.; Kate, Stephan P.; Rappich, Jörg; et al.