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Reducing dynamic disorder in small molecule organic semiconductors by suppressing large-amplitude thermal motions

par Illig, Steffen;Eggeman, Alexander S.;Troisi, Alessandro;Jiang, Lang;Warwick, Chris;Nikolka, Mark;Schweicher, Guillaume ;Yeates, Stephen G.;Geerts, Yves ;Anthony, John E.;Sirringhaus, Henning
Référence Nature communications, 7, 10736
Publication Publié, 2016-02-22

Article révisé par les pairs

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Résumé :

Thermal vibrations and the dynamic disorder they create can detrimentally affect the transport properties of van-der-Waals bonded molecular semiconductors. The low energy nature of these vibrations makes it difficult to access them experimentally which is why we still lack clear molecular design rules to control and reduce dynamic disorder. In this paper we discuss the promising organic semiconductors rubrene, 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothio-phene (C8-BTBT) and 2,9-di-decyl-dinaphtho-[2,3-b:20,30-f]-thieno-[3,2-b]-thiophene (C10DNTT) in terms of an exceptionally low degree of dynamic disorder. In particular, we analyze diffuse scattering in transmission electron microscopy to show that small molecules that have their side chains attached along the long axis of their conjugated core are better encapsulated in their crystal structure which helps reduce large-amplitude thermal motions. Our work provides a general strategy for the design of new classes of very high mobility organic semiconductors with a low degree of dynamic disorder.