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Monolayer Contact Doping of Silicon Surfaces and Nanowires Using Organophosphorus Compounds
Published on: December 2, 2013
Doping of magic nanoclusters in the submonolayer In/Si(100) system.
V G Kotlyar1, A V Zotov, A A Saranin
1Institute of Automation and Control Processes, 690041 Vladivostok, Russia.
Physical Review Letters
|August 9, 2003
Summary
Researchers discovered a way to modify silicon-indium nanoclusters, changing their electronic properties from semiconducting to metallic. This "doping" creates a more flexible cluster, impacting its behavior under an electrical field.
Area of Science:
- Surface Science
- Nanotechnology
- Materials Science
Background:
- The Si(100)4 x 3-In surface reconstructs into a superlattice of Si7In6 nanoclusters.
- These magic nanoclusters exhibit unique electronic and structural properties.
Purpose of the Study:
- To investigate the modification of Si7In6 nanoclusters into Si5In8 clusters.
- To understand the impact of this modification on cluster properties and stability.
Main Methods:
- Scanning Tunneling Microscopy (STM) for in-situ observation of nanocluster modification.
- First-principles total-energy calculations for atomic structure and stability analysis.
Main Results:
- Up to 35% of Si7In6 nanoclusters can be modified to Si5In8 clusters under specific growth conditions.
- The modification effectively 'dopes' the nanocluster, shifting its electronic properties from semiconducting towards metallic.
- The doped Si5In8 cluster exhibits reduced rigidity and dynamic behavior in the STM tip's electrical field.
Conclusions:
- The Si(100)4 x 3-In surface allows for controlled doping of magic nanoclusters.
- Cluster modification significantly alters electronic and mechanical properties, opening possibilities for new material functionalities.
- First-principles calculations confirm the structural and stability aspects of the doped nanoclusters.
