Secondary-Phase-Assisted Grain Boundary Migration in CuInSe2
| Autor: | Peter A. van Aken, Karsten Albe, Marc-Daniel Heinemann, Dieter Greiner, Ekin Simsek Sanli, Wilfried Sigle, Chen Li, Daniel Barragan-Yani, Helena Stange, Daniel Abou-Ras, Roland Mainz |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Condensed matter physics General Physics and Astronomy 01 natural sciences Molecular dynamics Phase (matter) 0103 physical sciences Scanning transmission electron microscopy Content (measure theory) Grain boundary Density functional theory Grain boundary migration 010306 general physics Deposition (law) |
| Zdroj: | Physical Review Letters. 124 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.124.095702 |
| Popis: | Significant structural evolution occurs during the deposition of ${\mathrm{CuInSe}}_{2}$ solar materials when the Cu content increases. We use in situ heating in a scanning transmission electron microscope to directly observe how grain boundaries migrate during heating, causing nondefected grains to consume highly defected grains. Cu substitutes for In in the near grain boundary regions, turning them into a Cu-Se phase topotactic with the ${\mathrm{CuInSe}}_{2}$ grain interiors. Together with density functional theory and molecular dynamics calculations, we reveal how this Cu-Se phase makes the grain boundaries highly mobile. |
| Databáze: | OpenAIRE |
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