Atomic Scale Structure of (001) Hydrogen-Induced Platelets in Germanium

An accurate characterization of the structure of hydrogen-induced platelets is a prerequisite for investigating both hydrogen aggregation and formation of larger defects. On the basis of quantitative high resolution transmission electron microscopy experiments combined with extensive first principles calculations, we present a model for the atomic structure of (001) hydrogen-induced platelets in germanium. It involves broken Ge-Ge bonds in the [001] direction that are dihydride passivated, vacancies, and trapped H-2 molecules, showing that the species involved in platelet formation depend on the habit plane. This model explains all previous experimental observations.