Morphology and properties of thin films of diketopyrrolopyrrole derivatives

Thin layers of five derivatives of 3,6-diphenyl-2,5-dihydro-pyrrolo[3,4-c]pyrrole-1,4 diones, which constitute a promising class of small molecular semiconductors, were investigated. The morphology of the thin layers prepared by both vacuum evaporation and spin casting were studied using Scanning Electron Microscopy and Atomic Force Microscopy. The relation between molecular structure and their thin films morphology was found. The electroluminescence behaviour of selected derivatives is also discussed with regard to morphology studies.