Structural phase contrast in polycrystalline organic semiconductor films 
observed by broadband near-field optical spectroscopy

Pomraenke, R.; Ropers, Claus; Renard, J.; Lienau, C.; Lüer, L.; Polli, D.; Cerullo, G.

doi:10.1021/nl070083i

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Structural phase contrast in polycrystalline organic semiconductor films observed by broadband near-field optical spectroscopy

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Ropers, Claus
Department of Ultrafast Dynamics, MPI for Biophysical Chemistry, Max Planck Society;

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Citation

Pomraenke, R., Ropers, C., Renard, J., Lienau, C., Lüer, L., Polli, D., et al. (2007). Structural phase contrast in polycrystalline organic semiconductor films observed by broadband near-field optical spectroscopy. Nano Letters, 7(4), 998-1002. doi:10.1021/nl070083i.

Cite as: https://hdl.handle.net/21.11116/0000-000B-5C92-9

Abstract

We demonstrate a novel near-field absorption spectrometer with 100 nm spatial resolution based on an ultrabroadband Ti:sapphire oscillator coupled to an aperture NSOM, enabling the measurement of nanoscale absorption spectra. The instrument is particularly suited for structural phase-selective imaging of organic materials at the nanoscale. We demonstrate that variations in the local absorption spectrum allow us to distinguish between the crystalline and the amorphous phases in polycrystalline phtalocyanine films, thus providing previously unavailable information on their mesoscopic texture.