Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 82: Focus Session: Unoccupied States by Inverse Photoemission III
O 82.4: Talk
Thursday, March 12, 2026, 11:45–12:00, WILL/A317
Observation of conduction band structure of conductive polymer PBTTT — •Taichi Suruga1, Shunichiro Ito2, Taishi Takenobu2, and Hiroyuki Yoshida1, 3 — 1Chiba University, Chiba, Japan — 2Nagoya University, Nagoya, Japan — 3Chiba University MCRC, Chiba, Japan
The most fundamental information regarding the electron transport mechanism of these polymers is the conduction-band structure. However, until now, we did not have the appropriate methods to measure it. In 2020, we developed angle-resolved low-energy inverse photoelectron spectroscopy (ARLEIPS) [1] and successfully measured the conduction band structure of small-molecule organic semiconductors for the first time [2]. In this study, we applied ARLEIPS to a conductive polymer. Fabricating crystalline thin films with well-aligned molecular orientation is essential for the ARLEIPS measurement. We fabricated thin films using the blade-coating method [3]. Using ARLEIPS, we observed the conduction-band structure of a conductive polymer, PBTTT-C14 [4,5], in oriented films. As predicted by the DFT calculations, the bands split into two and exhibited large dispersion along the Γ-Z direction. These results demonstrate the first observation of conduction-band in a conductive polymer. [1] Y. Kashimoto, H. Yoshida et al., Rev. Sci. Instrum, 94, 043908 (2023) [2] H. Sato, H. Ishii, H. Yoshida et al., Nat. Mater. 21, 910 (2022). [3] D. Delongchamp et al., ACS Nano. 3, 780 (2009). [4] H. Tanaka, K. Kanahashi, T. Takenobu et al., Sci. Adv., 6, eaay8065 (2020) [5] S. Ito, H. Tanaka, T. Takenobu et al., Appl. Phys. Express 18, 021002 (2025)
Keywords: energy band structure; conductive polymer; inverse photoelectron spectroscopy; blade coating; electron transport mechanism