Scanning tunnelling microscopy of semiconductor surfaces

Physics

Scientific paper

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Scientific paper

The application of scanning tunnelling microscopy (STM) to semiconductor surfaces is reviewed. After a brief description of theoretical models for STM the experimental requirements are summarized. STM results will be shown and discussed for clean semiconductor surfaces (Si(111), Si(100), Si(110), high-index faces of Si, Ge and GaAs). Examples will be given for the more important reconstructions of these surfaces and for temperature dependent phase transitions, e.g., for the high-temperature img1.gif transition of Si(111) and for the low-temperature c img2.gif transition of Si(100). The properties of steps will be described for Si(111) and Si(100). The study of adsorption and growth processes is one of the main fields in current STM work on semiconductors and representative examples will be given for homoepitaxy, heteroepitaxy, cross-sectional studies, metal adsorption and adsorption of small molecules which give rise to surface reactions. Finally, more recent applications such as manipulation of semiconductor surfaces, ballistic-electron emission, potentiometry and electrochemistry will briefly be reviewed.

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