▎ 摘　　要

Coronene, which is the smallest D-6h-symmetric polycyclic aromatic hydrocarbon, attracts particular attention as a basic component of electronic materials because it is the smallest fragment of graphene. However, carrier generation by physical methods, such as photo- or electric field-effect, has barely been studied, primarily because of the poor -conduction pathway in pristine coronene solid. In this work we have developed unprecedented -stacking columns of cationic coronene molecules by electrochemical hole-doping with polyoxometallate dianions. The face-to-face - interactions as well as the partially charged state lead to electrical conductivity at room temperature of up to 3Scm(-1), which is more than 10 orders of magnitude higher than that of pristine coronene solid. Additionally, the robust - interactions strongly suppress the in-plane rotation of the coronene molecules, which has allowed the first direct observation of the static Jahn-Teller distortion of cationic coronene molecules.