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Ge Epitaxy at Ultralow Growth Temperatures Enabled by a Pristine Growth Environment
Christoph Wilflingseder1, Johannes Aberl1, Enrique Prado Navarrete1
1Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Altenberger Straße 69, 4040, Linz, Austria.
ACS Applied Electronic Materials
|December 30, 2024
Summary
We explored growing high-quality germanium (Ge) layers on silicon (Si) at ultralow temperatures. Results show heteroepitaxial strain causes ripple formation, crucial for future nanoelectronics and quantum transport devices.
Area of Science:
- Materials Science
- Solid-state Physics
- Nanotechnology
Background:
- Germanium (Ge) is a key group-IV material for advancing silicon (Si) based nanoelectronics and quantum transport.
- Direct epitaxial growth of Ge on Si is critical for next-generation device integration.
Purpose of the Study:
- Investigate the direct epitaxial growth of 2D high-quality crystalline Ge layers on Si.
- Determine the effects of ultralow growth temperatures and pressures on Ge layer quality.
- Analyze the structural properties and surface morphology of Ge/Si(001) heteroepitaxy.
Main Methods:
- Positron annihilation lifetime spectroscopy for point defect analysis in homoepitaxial Ge.
- Atomic force microscopy (AFM) for surface topography assessment.
- Transmission electron microscopy (TEM) and nanobeam scanning X-ray diffraction (nBD) for structural and strain analysis.
Main Results:
- Decreasing growth temperature (100-350 °C) did not degrade crystal quality in homoepitaxial Ge/Ge(001).
- Ge/Si(001) layers exhibited a rippled surface topography without 3D structures like quantum dots.
- Pseudomorphic crystalline grains were observed, separated by defective domains, with strain fluctuations linked to ripples.
Conclusions:
- Ultralow growth temperatures (100-300 °C) enable high-quality Ge epitaxy on Si.
- Heteroepitaxial strain and kinetic limitations at low temperatures drive ripple formation in Ge/Si layers.
- This research provides insights for optimizing Ge growth for advanced nanoelectronic applications.
