Nanomorphology in thin films of acetamide end-functionalised quaterthiophene

Zeilmann N, Rösner B, Späth A, Schmidt U, Fink R (2015)

Publication Type: Journal article

Publication year: 2015


Book Volume: 583

Pages Range: 108-114

DOI: 10.1016/j.tsf.2015.03.066


α,ω-Functionalised oligothiophenes are promising materials for organic field effect transistors due to their high degree of molecular ordering, crystallinity and π-π stacking. We employ several complementary microspectroscopic probes to investigate the formation of thermally evaporated films of 5,5‴-bis(N-acetamido-2-ethyl)-2,2′:5′,2″:5″,2‴quaterthiophene on inert substrates. These films were found to grow in a mixed fashion, featuring layer-by-layer domains with thicknesses of several monolayers and needle-shaped three-dimensional crystals. Detailed analysis of atomic force microscopy (AFM) and photoluminescence microscopy reveals the micro- and nanomorphology of the films. Linear dichroism in the near edge x-ray absorption fine structure and polarisation-dependent laser excitation corroborate the findings of AFM, i.e., upright standing molecules in the multilayer regime. The shape of the 3-dimensional crystallites and multilayer domains indicates strongly anisotropic growth favoured by the herringbone-arrangement of the thiophene moieties and additional stabilisation by hydrogen bonding of the acetamide end groups.

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Zeilmann, N., Rösner, B., Späth, A., Schmidt, U., & Fink, R. (2015). Nanomorphology in thin films of acetamide end-functionalised quaterthiophene. Thin Solid Films, 583, 108-114.


Zeilmann, Nina, et al. "Nanomorphology in thin films of acetamide end-functionalised quaterthiophene." Thin Solid Films 583 (2015): 108-114.

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