研究目的
Investigating the formation of a Te buffer layer on Si(111)–(7×7) and its structural changes as a function of substrate temperature.
研究成果
The study concludes that Te forms different surface phases on Si(111)–(7×7) depending on the substrate temperature, with an atomically flat Te/Si(111)–(2√3×2√3)R30° reconstruction observed at higher temperatures. The clean Si(111)–(7×7) structure is recovered by heating to 970 K.
研究不足
The study is limited by the accuracy of temperature measurements and the inability to resolve individual Te atoms in STM measurements to extract a structural model.
1:Experimental Design and Method Selection:
The study combines low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM) to investigate the Te-covered Si(111) surface.
2:Sample Selection and Data Sources:
Si(111) samples were cleaned under ultra-high vacuum conditions, and Te was deposited from a Knudsen cell.
3:List of Experimental Equipment and Materials:
A home-built room-temperature Besocke-type STM equipped with electrochemically etched tungsten tips and a Knudsen cell for Te deposition.
4:Experimental Procedures and Operational Workflow:
Two separate experiments were performed: solid phase epitaxy under LEED observation and epitaxial growth of Te at elevated temperatures followed by LEED and STM analysis.
5:Data Analysis Methods:
LEED patterns and STM topographies were analyzed to determine the surface structures.
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