Abstract
In this chapter, we review our theoretical investigations of the electronically excited states in organic semiconductor materials. Detailed insights into the electronically excited states are essential for understanding the charge photogeneration process in organic solar cells. However, despite recent developments of quantum chemistry and ab initio software packages, it is still challenging to predict the electronic states of disordered organic materials, such as donor/acceptor interfaces. Here, we present first-principle studies of the organic semiconductors based on large-scale electronic structure calculations, highlighting the effects of intermolecular interactions and molecular aggregations on the excited states. We first outline the effects of molecular aggregations on the electronic states, polarization and delocalization effects. Next, we summarize the recent developments in large-scale electronic structure calculations based on the many-body Green’s function and fragment molecular orbital method. In particular, the advantages of the many-body Green’s function method within the GW approximation are discussed in terms of the exciton binding energy. As an application, we investigate the electronic states of pentacene clusters and illustrate the roles of polarization and delocalization effects. Moreover, we explore the interfacial charge-transfer states in a pentacene/C60 interface structure and discuss the role of induced polarization in the electron-hole pair separation. Finally, we briefly address future challenges for first-principle studies.
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Acknowledgements
T.F. thanks Prof. Yuji Mochizuki, Dr. Tatsuya Nakano, and Dr. Yoshio Okiyama for their collaborations on the FMO-based excited-state calculations and their implementation in the ABINIT-MP program. T.F. also thanks Prof. Yoshifumi Noguchi at Shizuoka University for collaboration on the developments of FMO-GW/BSE methods, Prof. Takeo Hoshi at Tottori University for collaboration on organic materials, and Prof. Seiichiro Izawa at Institute for Molecular Science for discussion on the organic solar cells. T.F. acknowledges the financial supports from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) as a Building of Consortia for the Development of Human Resources in Science and Technology and from a Grant-in-Aid for Scientific Research (C) (19K05255) from the Japan Society for the Promotion of Science (JSPS). The majority of the FMO calculations in this work were performed using the facilities at the Supercomputer Center, the Institute for Solid State Physics, the University of Tokyo. The Gaussian calculations in this work were conducted at the Research Center for Computational Science, Okazaki, Japan.
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Fujita, T. (2021). First-Principles Investigations of Electronically Excited States in Organic Semiconductors. In: Hiramoto, M., Izawa, S. (eds) Organic Solar Cells. Springer, Singapore. https://doi.org/10.1007/978-981-15-9113-6_7
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