Correlation between structural and electrical properties of InN thin films prepared by molecular beam epitaxy |
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Authors: | V Lebedev FM Morales V Cimalla JG Lozano D Gonzlez M Himmerlich S Krischok JA Schaefer O Ambacher |
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Institution: | aInstitute of Micro- and Nanotechnologies, Technical University Ilmenau, D-98684 Ilmenau, Germany;bDpto. de Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica, Facultad de Ciencias, Universidad de Cádiz, 11510-Puerto Real-Cádiz, Spain |
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Abstract: | The strain-relaxation phenomena and the formation of a dislocation network in 2H-InN epilayers during molecular beam epitaxy are reported. The proposed growth model emphasizes the dominant role of the coalescence process in the formation of a dislocation network in 2H-InN. Edge type threading dislocations and dislocations of mixed character have been found to be the dominating defects in wurtzite InN layers. It is demonstrated that these dislocations are active suppliers of electrons and an exponential decay of their density with the thickness implies a corresponding decay in the carrier density. Room temperature mobility in excess of 1500 cm2 V −1 s−1 was obtained for 800 nm thick InN layers with dislocation densities of 3×109 cm−2. |
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Keywords: | InN Epitaxy Dislocations Electron transport |
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