Abstract
The study of charge mobility in organic semiconductor systems has been one of the most important subjects that has remained a puzzle for many years. It is essential to quantitatively understand conduction charge-molecular vibration coupling as well as the intermolecular interaction to discuss mobility. This chapter describes recent successes with direct measurements of valence hole-vibration coupling in ultrathin films of organic semiconductors by using ultraviolet photoelectron spectroscopy (UPS), which can be used to experimentally study charge mobility based on energy and momentum conservation rules. The method may thus be categorized as a first-principles study of charge mobility. The detection of hole-vibration coupling of the highest occupied molecular orbital (HOMO) state in a thin film by UPS is essential to comprehend hole-hopping transport and polaron-related transport in organic semiconductors. Only careful measurements can attain the high-resolution spectra and provide these key parameters in hole-transport dynamics. A key method in achieving such high-resolution UPS measurements is also described.
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Acknowledgements
The authors are very grateful to Prof. V. Coropceanu and Dr. S. Nagamatsu for stimulating discussions on the computation as well as many students in the Graduate School of Chiba University for doing experiments.
The study is partly supported by JSPS KAKENHI (24245034, 20245039, 20685014, 20656002, 17685019), 21st Century COE program (MEXT) and Global COE program (MEXT).
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Kera, S., Yamane, H., Ueno, N. (2015). Ultraviolet Photoelectron Spectroscopy (UPS) II: Electron–Phonon Coupling and Hopping Mobility. In: Ishii, H., Kudo, K., Nakayama, T., Ueno, N. (eds) Electronic Processes in Organic Electronics. Springer Series in Materials Science, vol 209. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55206-2_3
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