Morphology in solution and film

Besides electronic structure, morphology of organic semiconductors has been identified as crucial for efficiency of organic electronic devices. Hence, gaining detailed insight into the morphology in thin films as well as in solution prior to casting is of outstanding interest. EPR spectroscopy provides unique capabilities due to its inherent molecular resolution and its ability to reveal preferential orientation of molecules in non-crystalline environments.

How does the solvent affect morphology and aggregation in solution?

  • method: TREPR @ X-Band, 80 K

  • method: variable-temperature UV/Vis spectroscopy

  • preparation: (frozen) solution

  • analysis: fitting of triplet spectra

Do polymer films show overall order despite being noncrystalline?

  • method: angular-dependent TREPR @ X-Band, 80 K

  • method: variable-temperature UV/Vis spectroscopy

  • preparation: drop-cast films on flat substrates

  • analysis: global fitting of triplet spectra (including partial orientation)

How do side-chains affect film morphology?

  • method: angular-dependent TREPR @ X-Band, 80 K

  • preparation: drop-cast films on flat substrates

  • analysis: global fitting of triplet spectra (including partial orientation)