Experimental studies of electron affinity and work function from titanium on oxidised diamond (100) surfaces
| Autor: | Fabian Fogarty, Neil A. Fox, Paul W. May |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Functional Diamond, Vol 2, Iss 1, Pp 103-111 (2022) |
| Druh dokumentu: | article |
| ISSN: | 2694-1120 26941112 |
| DOI: | 10.1080/26941112.2022.2122733 |
| Popis: | Sub-monolayers of titanium were deposited onto oxidised (100) single-crystal diamond surfaces and annealed in vacuo at temperatures up to 1000 °C to find a temperature-stable termination procedure that produces a surface with Negative Electron Affinity (NEA). The samples were analysed by X-ray Photoelectron Spectroscopy, Ultraviolet Photoelectron Spectroscopy and Energy-Filtered Photoemission Electron Microscopy to determine their electron affinity and work function values. NEA values were observed on samples following annealing above 400 °C, with the largest NEA value being –0.9 eV for a sample coated with a half-monolayer of Ti annealed at 400 °C. Work function values were ∼4.5 eV for all samples annealed at temperatures between 400 and 600 °C, then rose at higher temperatures due to the loss of substantial amounts of O from the surface. Work-function maps indicated that the surface was uniform over areas 5700 μm2, suggesting that the deposition and annealing steps used are reliable methods to produce films with homogeneous surface properties. |
| Databáze: | Directory of Open Access Journals |
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