<研究ノート>有機半導体の空準位と電子親和力の新しい精密測定法 : 近紫外逆光電子分光法の開発

Abstract

We demonstrate inverse-photoemission spectroscopy (IPES) in the near-ultraviolet range (hν < 5 eV) using electrons with kinetic energies less than 4 eV for the first time. The energy resolution of the instrument is attained to be 0.27 eV which is a factor of two better than the conventional IPES. From the spectra of a typical organic semiconductor, copper phthalocyanine, it is found that damage to the organic sample is significantly reduced, showing that this method is especially suitable to examine unoccupied states and precisely determine the electron affinities of organic semiconducting materials.