Global search for stable screw dislocation cores in III-N semiconductors
| Autor: | S. Kraeusel, Benjamin Hourahine |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
010302 applied physics
Dislocation creep Materials science Condensed matter physics Band gap business.industry Doping Dangling bond 02 engineering and technology Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Crystal Crystallography Semiconductor 0103 physical sciences Materials Chemistry Electrical and Electronic Engineering Dislocation 0210 nano-technology business Wurtzite crystal structure |
| Zdroj: | physica status solidi (a). 209:71-74 |
| ISSN: | 1862-6300 |
| DOI: | 10.1002/pssa.201100097 |
| Popis: | The promise of the broad range of direct band gaps of the {Al,Ga,In}N system is limited by the crystal quality of current material. As grown defect densities of InN, when compared with the more mature GaN, are extremely high and InN is strongly influenced by these defects. This is particularly important due to the unusual position of the charge neutrality level of InN, leading to both the well known surface charge accumulation and difficulties in p-type doping. While impurities and native defects clearly impact on the bulk carrier density in InN, the effects of threading dislocations on the electrical properties are still in dispute. Issues such as whether the dislocation line is charged or contains dangling bonds remain open. We present the results of a global search for possible dislocation core reconstructions for a range of screw dislocations in wurtzite III-N material, utilizing empirical Stillinger-Weber inter-atomic potentials. In addition we investigate a wide range of non-stoichiometric core structures. |
| Databáze: | OpenAIRE |
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