Ether-like Si–Ge hydrides for applications in synthesis of nanostructured semiconductors and dielectrics

Jesse B. Tice, Change Weng, John Tolle, Vijay R. D'Costa, Rachna Singh, Jose Menendez, John Kouvetakis, Andrew Chizmeshya

Research output: Contribution to journalArticle

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Abstract

Hydrolysis reactions of silyl-germyl triflates are used to produce ether-like Si–Ge hydride compounds including H3SiOSiH3 and the previously unknown O(SiH2GeH3)2. The structural, energetic and vibrational properties of the latter were investigated by experimental and quantum chemical simulation methods. A combined Raman, infrared and theoretical analysis indicated that the compound consists of an equal mixture of linear and gauche isomers in analogy to the butane-like H3GeSiH2SiH2GeH3 with an exceedingly small torsional barrier of ∼0.2 kcal mol−1. This is also corroborated by thermochemistry simulations which indicate that the energy difference between the isomers is less than 1 kcal mol−1. Proof-of-principle depositions of O(SiH2GeH3)2 at 500 °C on Si(100) yielded nearly stoichiometric Si2Ge2O materials, closely reflecting the composition of the molecular core. A complete characterization of the film by RBS, XTEM, Raman and IR ellipsometry revealed the presence of Si0.30Ge0.70 quantum dots embedded within an amorphous matrix of Si–Ge–O suboxide, as required for the fabrication of high performance nonvolatile memory devices. The use of readily available starting materials coupled with facile purification and high yields also makes the above molecular approach an attractive synthesis route to H3SiOSiH3 with industrial applications in the formation of Si–O–N high-k gate materials in high-mobility SiGe based transistors.

Original languageEnglish (US)
Pages (from-to)6773-6782
Number of pages10
JournalJournal of the Chemical Society. Dalton Transactions
Issue number34
DOIs
StatePublished - Aug 18 2009

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Hydrides
Ether
Semiconductor materials
Isomers
Thermochemistry
Ellipsometry
Semiconductor quantum dots
Industrial applications
Purification
Hydrolysis
Transistors
Infrared radiation
Data storage equipment
Fabrication
Chemical analysis
butane

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Ether-like Si–Ge hydrides for applications in synthesis of nanostructured semiconductors and dielectrics. / Tice, Jesse B.; Weng, Change; Tolle, John; D'Costa, Vijay R.; Singh, Rachna; Menendez, Jose; Kouvetakis, John; Chizmeshya, Andrew.

In: Journal of the Chemical Society. Dalton Transactions, No. 34, 18.08.2009, p. 6773-6782.

Research output: Contribution to journalArticle

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