Photoluminescence Studies of Cadmium Selenide Crystals in Contact with Group III Trialkyl Derivatives
| Autor: | Edmund J. Winder, Thomas F. Kuech, Arthur B. Ellis |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Photoluminescence
Cadmium selenide Renewable Energy Sustainability and the Environment Butylamine Chemistry Inorganic chemistry Langmuir adsorption model Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials symbols.namesake chemistry.chemical_compound Materials Chemistry Electrochemistry symbols Physical chemistry Triethylgallium Trimethylgallium Trimethylindium Group 2 organometallic chemistry |
| Zdroj: | Journal of The Electrochemical Society. 145:2475-2479 |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/1.1838663 |
| Popis: | Upon exposure to several group III trialkyls: trimethylaluminum, trimethylgallium, triethylgallium, and trimethylindium, the bandedge photoluminescence intensity of etched single-crystal n-CdSe samples exhibits a large and irreversible enhancement relative to a vacuum reference ambient. From X-ray photoelectron spectroscopy, this photoluminescence enhancement, which ranges from factors of {approximately}3 to 100, appears to correspond to irreversible binding of a group III metal-bearing species to the surface. Subsequent exposure of the sample to butylamine, C{sub 4}H{sub 11}N, isomers can partially reverse this enhancement by {approximately}10 to 80%, depending upon the amine and group III trialkyl precursor combination, presumably through adduct formation with a group III atom-derived, surface-confined species. The magnitude of the amine interaction appears to be the greatest for combinations of less bulky amines with trimethylaluminum- and trimethylgallium-derived species. Reversible photoluminescence enhancements could be obtained through use of volatile discrete 1:1 trimethylamine adducts of trimethylaluminum and trimethylgallium. These adducts bind to the CdSe surface with an equilibrium constant of {approximately}10{sup 4} atm{sup {minus}1}, based on the Langmuir adsorption isotherm model. Implications for the use of these effects in sensing chemical vapor deposition precursor molecules are discussed. |
| Databáze: | OpenAIRE |
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