Web Release Date: August 28,
SnTe Nanocrystals: A New Example of Narrow-Gap Semiconductor Quantum Dots
and
Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, A-4040 Linz, Austria, and The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720
Received June 19, 2007
Abstract:
A solution-phase synthesis of monodisperse SnTe nanocrystals via the reaction of bis[bis(trimethylsilyl)amino]tin(II) with trioctylphosphine telluride in oleylamine is demonstrated. The obtained SnTe nanocrystals are single-crystalline particles with a cubic rock-salt crystal structure. The size of the SnTe nanocrystals can be precisely tuned in the range of 4.5-15 nm by tailoring the reaction temperature and stabilizer concentration. These SnTe nanocrystals exhibit size-tunable band gap energies of 0.38-0.8 eV. The narrow size-distributions allow assembling SnTe nanocrystals into 3-dimensional superlattices.
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