Effect of sodium diffused into Bridgman CuInSe 2+x
| Autor: | Clifford H. Champness, Sunyoung Park, Ishiang Shih |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Radiation Annealing (metallurgy) Chalcopyrite Sodium Binding energy Analytical chemistry chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials chemistry X-ray photoelectron spectroscopy visual_art 0103 physical sciences visual_art.visual_art_medium Physical and Theoretical Chemistry 0210 nano-technology p–n junction Spectroscopy Stoichiometry |
| Zdroj: | Journal of Electron Spectroscopy and Related Phenomena. 212:21-27 |
| ISSN: | 0368-2048 |
| DOI: | 10.1016/j.elspec.2016.07.003 |
| Popis: | The study describes diffusion of elemental sodium into p -type samples of Bridgman-grown CuInSe 2+x , causing a change from p - to n -type behavior at the surface and deep into the material. This resulted in the creation of Na 1s and Se 3d XPS peaks at binding energies of 1071 and 54.5 eV respectively, where the latter has been attributed to CuInSe 2 itself. Subsequent annealing of the samples in air gave rise to a second Se 3d peak at 59 eV, attributed to Na 2 SeO 3 by oxidation of Na 2 Se. However, SeO 2 also gives a peak at about the same binding energy. The presence of the diffused-in Na up to about 10% at the surface appears to promote the creation of a high ratio [Se]/[Cu] compound at the expense of the chalcopyrite at the sample surface. The diffused-in samples showed n/p homojunctions at depths of tens of microns for stoichiometric CuInSe 2 and at smaller depths for CuInSe 2.2 , with excess Se content. Estimates of the diffusion coefficient for Na into the Bridgman samples at 250 °C were in the range of 10 −10 –10 −8 cm 2 /s. |
| Databáze: | OpenAIRE |
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