[3Ia01-06] Two-Dimensional (2D) Materials

[3Ia05] Germanene to germanane: surface physics to device physics

*Osamu Kubo^1,2 (1. Faculty of Engineering, Gifu University, 2. Graduate School of Engineering, Osaka University)

Monolayer honeycomb sheet of Ge, called germanene, were predicted to have very curious physical properties superior to graphene. In this study, We first report on the atomic and electronic band structure of germanene formed on Al(111) substrate measured using low-energy ion scattering spectroscopy and angle-resolved photo emission spectroscopy, respectively.
As the second topic, we report on the electrical characteristics of hydrogenated germanane (GeH) and methylated germanane (GeCH₃) which are semiconductor of about 1.6 eV and 1.8 eV direct bandgaps, respectively, even in a multilayered structure. We also report the photocurrent characteristics of GeCH₃ thin film by illumination of monochromatic light of various wavelengths.