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In Situ SIMS and IR Spectroscopy of Well-defined Surfaces Prepared by Soft Landing of Mass-selected Ions

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Positronium formation at 4H SiC(0001) surfaces.

A Kawasuso¹, K Wada¹, A Miyashita¹

¹National Institutes for Quantum and Radiological Science and Technology, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|October 5, 2020

Summary

This summary is machine-generated.

Researchers studied positronium formation on 4H Silicon Carbide (SiC) surfaces. Two distinct positronium types were observed, with one exhibiting higher energy than theoretically predicted, suggesting novel formation mechanisms involving surface electrons.

Keywords:

SiC positron re-emission positronium surface

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Area of Science:

Materials Science
Surface Science
Condensed Matter Physics

Background:

Understanding positronium (Ps) formation is crucial for characterizing material surfaces.
Silicon Carbide (SiC) is a wide-bandgap semiconductor with diverse applications.
Surface oxides can impede accurate positron annihilation spectroscopy measurements.

Purpose of the Study:

To investigate positronium formation on clean 4H-SiC(0001) surfaces.
To analyze the energy distribution of formed positronium.
To elucidate the role of surface electronic states in positronium generation.

Main Methods:

Preparation of 4H-SiC(0001) surfaces via hydrofluoric acid etching and ultra-high vacuum (UHV) annealing at 1000 K.
Positronium time-of-flight (PsTOF) measurements to determine Ps energy spectra.
Analysis of PsTOF spectra irrespective of surface conduction type and polarity.

Main Results:

Two distinct positronium types were observed.
A primary Ps component showed a maximum energy of 4.7 ± 0.3 eV, exceeding theoretical predictions based on valence electrons.
A secondary, thermally-assisted Ps component (0.2-0.5 eV) emerged at 1000 K, potentially involving surface state positrons and electrons.

Conclusions:

The observed high-energy Ps suggests that surface state or conduction electrons, not just valence electrons, contribute to Ps formation on 4H-SiC.
The distinct PsTOF spectrum shape differs from metal surfaces, highlighting unique SiC surface electronic properties.
The findings provide insights into positron interactions with semiconductor surfaces and potential applications in surface analysis.