Regensburg 2013 – scientific programme

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DS: Fachverband Dünne Schichten

DS 32: Poster Session IV: Atomic layer deposition; Organic thin films; Organic Electronics and Phototovoltaics; Organic Materials for Spintronics - from spinterface to devices; Thin film photovoltaic materials and solar cells

DS 32.22: Poster

Thursday, March 14, 2013, 17:00–20:00, Poster B2

Controling molecular orientation of Azaacen relatives of pentacene by substrate-choice — •Michael Klues¹, Tobias Breuer¹, Julius Kögel², Jörg Sundermeyer², and Gregor Witte¹ — ¹Physics Department, Philipps Uni. Marburg, 35032 Marburg — ²Chemistry Department, Philipps Uni. Marburg, 35032 Marburg

Nitrogen substitution of the central ring of pentacene suggests to supply a chemical more robust but almost iso-electronic molecular compounds. However, previous studies revealed for such diaza-pentacene (DAP) an entire different crystal structure than for pentacene as well as a poor charge carrier mobility. By contrast dihydrodiaza-pentacene (DHDAP) resembles the crystalline packing of pentacene and exhibits excellent charge carrier mobility although this hydrogenation is expected to break the conjugation [1]. To gain deeper insight into the electronic and structural properties of these various acenes, thin films of all compounds were studied by means of XPS, NEXAFS and XRD. Moreover, different substrates were used since this allows a control of the molecular orientation. XPS data signify an instability of DAP during the evaporation process and suggests an degradation which could be an explanation for the poor charge carrier mobility, in addition to the disadvantageous crystal structure.

[1]Qian Miao. N-heteropentacenes and n-heteropentacenequinones: From molecules to semiconductors. SYNLETT, (3):326-336, 2012