[20p-231C-1~9] Frontier of organic semiconductor crystals: Toward the Molecular Science of Quantum Liberated Electrons

[20p-231C-6] Characteristics of electronic state of molecular crystal: Evolution of charge localization

〇Satoshi Kera¹ (1.IMS)

Keywords:electronic structure, ARUPS, electron-phonon coupling

For molecular solids loosely bound by weak vdW forces, the intermolecular interaction is remarkably different depending on the aggregate, hence the electronic state often varies unexpectedly. Recently we succeded to observe the impact of quasiparticle state on the energy-band dispersion of rubrene single crystal by angle-resolved UPS. We found that both non-local lattice phonon and local molecular vibration may couple to the electron, leading strong modification of the band dispersion and renormalization of the effective hole mass. A clue to understand the essence of the function and physical properties of molecular materials judged from "character of a transporting electron" will be introduced.