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Molecular precursors to gallium oxide thin films
Siama Basharat1, Claire J Carmalt, Simon J King
1Department of Chemistry, Christopher Ingold Laboratories, University College London, UK.
Dalton Transactions (Cambridge, England : 2003)
|October 29, 2004
Summary
New gallium alkoxide compounds were synthesized and characterized. These novel organometallic precursors can be used to create thin films of gallium oxide via chemical vapor deposition.
Area of Science:
- Organometallic Chemistry
- Materials Science
- Inorganic Chemistry
Background:
- Gallium alkoxides are important precursors in materials science.
- Understanding their synthesis and properties is crucial for developing new materials and processes.
- Previous research has focused on various gallium compounds, but specific structural and deposition characteristics of certain alkoxides remain to be fully explored.
Purpose of the Study:
- To synthesize and characterize novel donor-functionalised gallium alkoxides.
- To investigate the structural features of these compounds, including the first structurally characterized monomeric gallium bisalkoxide.
- To explore the potential of these compounds as precursors for thin film deposition using chemical vapor deposition (CVD).
Main Methods:
- Synthesis of donor-functionalised alkoxides via reactions of triethylgallium (Et(3)Ga) and gallium tris(dimethylamide) ([Ga(NMe(2))(3)](2)) with various alcohols (ROH).
- Characterization using X-ray crystallography to determine molecular structures.
- Thermal gravimetric analysis (TGA) to study decomposition behavior.
- Low-pressure chemical vapor deposition (CVD) to evaluate thin film formation.
Main Results:
- Successful synthesis of several donor-functionalised gallium alkoxides, including dimeric and monomeric bisalkoxides.
- X-ray crystallography confirmed the monomeric structure of a novel gallium bisalkoxide (compound 6).
- Thermal decomposition studies provided insights into the stability of the synthesized compounds.
- Low-pressure CVD using specific alkoxide precursors (compounds 1 and 5) yielded crystalline gallium oxide (Ga(2)O(3)) thin films.
Conclusions:
- The study successfully synthesized and structurally characterized new gallium alkoxide complexes.
- A novel monomeric gallium bisalkoxide was identified, expanding the known structural diversity of gallium compounds.
- The synthesized alkoxides demonstrate potential as effective precursors for the deposition of gallium oxide thin films via CVD.