Ms. Lindsay Pell Profile

Lindsay Pell

at Univ of Texas at Austin

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Proceedings Article | 5 November 2002 Paper

Optical properties of silicon nanocrystals synthesized in supercritical fluids

Lindsay Pell, Brian Korgel

Proceedings Volume 4808, (2002) https://doi.org/10.1117/12.452254

KEYWORDS: Nanocrystals, Silicon, Luminescence, Crystals, Quantum efficiency, Spectroscopy, Particles, Transmission electron microscopy, Optical properties, Atomic force microscopy

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We developed a supercritical solution phase synthesis of silicon nanocrystals. High temperature and pressure (500°C, >140 bar) conditions allow a wet chemical approach to this challenging synthesis. Diphenylsilane was used as a silicon precursor and long chain thiols and alcohols were used to sterically stabilize the luminescent nanocrystals. Moderate size separation was achieved via size exclusion chromatography using crosslinked styrene divinylbenzene beads. Size separated fractions of silicon nanocrystals exhibit quantum efficiencies of 12% while polydisperse samples have quantum efficiencies of 5%. Nanocrystal size distributions have been determined with transmission electron microscopy and further characterized with atomic force microscopy (AFM). These silicon nanocrystals have size tunable photoluminescence as indicated by their ensemble spectroscopy and further verified through AFM and single nanocrystal photoluminescence spectroscopy. Fluorescence intermittency (characteristic of single CdSe nanocrystals) is present in our isolated silicon nanocrystals and is one of the criteria used to distinguish single crystals from clusters of particles.

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