X-ray microscopic investigation of molecular orientation in a hole carrier thin film for organic solar cells

Abstract : As dipyranylidenes are excellent hole carriers, applications in organic solar cells or organic light emitting diode are envisaged. In the present study, we investigate the morphology of 2,2′,6,6′-tetraphenyl-4,4′-dipyranylidene (DIPO-Ph$_4$) deposited under vacuum on a silicon nitride (Si$_3$N$_4$) substrate, a paradigmatic system for the study of molecular crystal/inorganic substrate interfaces. Samples with various coating ratios and different thermal treatments were prepared. The films were characterized by atomic force microscopy and scanning transmission X-ray microscopy to gain insight into material growth. The results show a change in orientation at a molecular level depending upon the evaporation conditions. We are now able to tailor an organic layer with a specific molecular orientation and a specific electronic behavior.
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Dernière modification le : jeudi 5 juillet 2018 - 18:23:21
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Quentin Arnoux, Benjamin Watts, Sufal Swaraj, Francois Rochet, Ludovic Tortech. X-ray microscopic investigation of molecular orientation in a hole carrier thin film for organic solar cells. Nano Research, Springer, 2017, 5, pp.2771-2782. 〈https://doi.org/10.1007/s12274-017-1907-6〉. 〈10.1007/s12274-017-1907-6〉. 〈cea-01659809〉

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