Abstract
An extended study on a group of four soluble diphenyl-amino-stilbene based diphenyl-diketopyrrolo-pyrrole molecules has been carried out. Using the materials in thin-film transistors it was shown that the above-mentioned compounds can be successfully used as donors in organic photovoltaic devices. Influence of the molecular symmetry and solubilizing chain on the morphology and solar cell performance are described. It was shown that a shorter and non-branched ethyl acetate chain leads to higher charge carrier mobility, short circuit current, and better fill factor. After the basic optimization, a power conversion efficiency of about 1.5 % was reached. This, to the best of our knowledge, is the highest reported efficiency of thiophene-free small-molecule diketo-pyrrolopyrroles.
Acknowledgements
This work was supported by the Czech Science Foundation under project No. 15-05095S. Research infrastructure was supported by project MSMT No. LO1211. L.F. acknowledges MEYS: SAFMAT LM2015088 a LO1409.
Supplementary data
Supplementary data associated with this article can be found in the online version of this paper (DOI: 10.1515/chempap-2016-0068).
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