Abstract
Indium-rich InAlN films were prepared on Si (111) substrates by using reactive co-sputtering in a mixed Ar-N2 atmosphere. The substrate temperature was varied from room temperature to 300 °C to investigate the film’s growth and properties at different temperatures. Structural and optical properties of the films were evaluated through high resolution XRD and Raman spectroscopy respectively, surface morphology and roughness analysis was performed by using FE-SEM and AFM respectively, whereas the electrical characterizations were made through resistivity and current–voltage (I–V) measurements respectively. Highly c-axis oriented nanocrystalline InAlN films with wurtzite structure were obtained at a substrate temperature of 100 °C and above. Structural quality of the films was improved with increase of the substrate temperature. The Raman spectroscopy revealed A1 (LO) modes which became more intense by the increasing the substrate temperature. The electrical studies indicated n-type nature of InAlN film having electron concentration in the range 3 × 1019–20 × 1019 cm−3. The electrical resistivity exhibited a decreasing trend with increase of the deposition temperature. The I–V measurements showed a noticeable increase in the value of current by increasing the substrate temperature to 300 °C.
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Acknowledgments
It is gratefully acknowledged the financial support provided by Universiti Sains Malaysia (USM), Malaysia and The World Academy of Sciences (TWAS), Italy for this work. The technical support of Mr. Jamil for the sputter deposition and Mr. Mushtaqim Abubakar for the XRD is also acknowledged.
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Afzal, N., Devarajan, M. & Ibrahim, K. Influence of substrate temperature on the growth and properties of reactively sputtered In-rich InAlN films. J Mater Sci: Mater Electron 27, 4281–4289 (2016). https://doi.org/10.1007/s10854-016-4294-y
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DOI: https://doi.org/10.1007/s10854-016-4294-y