Synthesis of Amorphous Germane by Tunneling Reactions of Hydrogen Atoms with van der Waals GeH4 Films at Cryogenic Temperatures

概要

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The reactions of hydrogen atoms with a thin GeH4 film condensed on a substrate at 10 K led to the formation of amorphous-like solid film. The solid products were analyzed by in-situ Fourier transform-infrared spectroscopy, ex-situ spectroscopic ellipsometry, and X-ray photoelectron spectroscopy. It was found that the solid products were mainly composed of hydrogenated amorphous germane and polygermanes. It was proposed that the singlet GeH2 which is the intermediate product in the consecutive reactions of H with GeH4 inserts into the neighboring Ge–H bonds resulting in the Ge–Ge bond network. It was found that up to the equivalent ${\sim}23$ GeH4 monolayers from the top surface of the reactant GeH4 film were converted to the solid product but not deeper.
2009-11-25