Work function tailoring in gallium phosphide nanowires
| Autor: | G E Cirlin, Mikhail Nestoklon, Ivan Mukhin, Alexander V. Ankudinov, Alexey D. Bolshakov, V. A. Sharov, Prokhor A. Alekseev, Georgy Sapunov, Vladimir V. Fedorov, Olga Yu. Koval, Demid A. Kirilenko |
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| Rok vydání: | 2021 |
| Předmět: |
Kelvin probe force microscope
Work (thermodynamics) Materials science Condensed matter physics Nanowire General Physics and Astronomy 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Crystal chemistry.chemical_compound chemistry Gallium phosphide Work function Density functional theory 0210 nano-technology Crystal twinning |
| Zdroj: | Applied Surface Science. 563:150018 |
| ISSN: | 0169-4332 |
| Popis: | In this work we investigate effects of the crystal phase, twinning defects and shell formation on the work function distribution over the surface of axially heterostructured GaP/GaPAs/GaP nanowires via frequency-modulated Kelvin probe force microscopy. Analysis of experimental data is supported by theoretical model based on density functional theory and Schrodinger–Poisson calculations. The study revealed that the work function of pure (110) ZB and ( 11 2 ¯ 0 ) WZ GaP is 4.34 eV and 4.20 eV respectively. The work function is found to be sensitive to the lattice twinning period which can additionally shift it between the value of WZ and ZB. Formation of a sub-monolayer thick GaPAs shell results in drastic increase of the work function (up to 4.75 eV). Thus, in this work we introduce several techniques for manipulating GaP nanowire work function. The ability to distinguish different crystal phases of the same material by means of Kelvin probe microscopy is shown for the first time. |
| Databáze: | OpenAIRE |
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