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Abstract
The electronic properties of polycrystalline 6,13-Bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene) was probed by inner-shell spectroscopies such as near-edge X-ray absorption fine structure (NEXAFS) spectroscopy and electron emission spectroscopy at the Si K-edge. Although the lowest unoccupied molecular orbital (LUMO) near the Fermi level is mainly on the acene unit, a small LUMO peak was observed in Si 1s NEXAFS spectra. Angle-dependent NEXAFS spectra indicate that a well-ordered structure is produced in the polycrystalline TIPS-pentacene. It was demonstrated that randomly oriented small single-crystal grains can be aligned by rubbing the powder sample.
Acknowledgments
We thank the staff of the Photon Factory and BL-27A (JAEA) for supporting our experiments. This work was supported by a Japan Society for the Promotion of Science (JSPS) KAKENHI (23550037) Grant-in Aid for Scientific Research (C). This work was performed under the approval of the Photon Factory Program Advisory Committee (Proposal No. 2010G653 and 2013G714).