Abstract
A systematic study on the thin film morphology of heteroacenic derivatives such as indolo[2,3-a]carbazole and 11,12-dioctylindolo[2,3-a]carbazole has been carried out using scanning force microscopy and optical microscopy techniques. The investigation has comprised the preparation of a series of thin films by combining different solvents (dimethylformamide and tetrahydrofurane), substrates (glass, gold, silicon and aluminium) and deposition techniques (spin coating and thermal evaporation) we found a wide variety of self-assembled structures. In addition, conductivity measurements have been performed, showing a very large spread in conductivity values. Some of the samples give quite high conductivity while others conduct very poorly, even in the case of samples prepared with essentially the same conditions. These results indicate that morphology is very critical for the final conductivity of the thin films. In addition we conclude that for some of the films prepared the homogeneous thin film approximation must be revised otherwise obtained conductivity measurements lead to significant error.
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Acknowledgments
This work was supported by the Spanish Ministry of Science and Technology through the projects MAT2010-21267-C02 and CONSOLIDER Programme “Force for Future” (CSD2010-00024) as well as by the “Comunidad Autónoma de la Región de Murcia” through the proyect “Células solares orgánicas: de la estructura molecular y nanométrica a dispositivos operativos macroscópicos”. M.M.M. acknowledges Ministry of Education for a FPU fellowship. I.N.C. also acknowledges support from the Comunidad Autónoma de la Región de Murcia through a scholarship from the Fundación Séneca.
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Nieto-Carvajal, I., Más-Montoya, M., Abad, J. et al. Conductivity and nanoscale morphology of thin films prepared from indolo[2,3-a]carbazole and 11,12-dioctylindolo[2,3-a]carbazole. J Mater Sci: Mater Electron 25, 5452–5461 (2014). https://doi.org/10.1007/s10854-014-2328-x
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DOI: https://doi.org/10.1007/s10854-014-2328-x