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Effects of growth temperature on electrical and structural properties of sputtered GaN films with a cermet target

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Abstract

GaN films have been deposited at 100–400 °C substrate temperature on Si (100) and sapphire (0001) substrates by RF reactive sputtering in an (Ar + N2) atmosphere. A (Ga + GaN) cermet target for sputtering was made by hot pressing the mixed powders of metallic Ga and ceramic GaN. The effects of substrate temperature on the GaN formation and its properties were investigated. The diffraction results showed that GaN films with a preferential (10–10) growth plane had a wurtzite crystalline structure. GaN films became smoother at higher substrate temperature. The Hall effect measurements showed the electron concentration and mobility were 1.04 × 1018 cm−3 and 7.1 cm2 V−1 s−1, respectively, for GaN deposited at 400 °C. GaN films were tested for its thermal stability at 900 °C in the N2 atmosphere. Electrical properties slightly degraded after annealing. The smaller bandgap of ~3.0 eV is explained in terms of intrinsic defects and lattice distortion.

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Acknowledgment

This work was supported by the National Science Council of the Republic of China under grant number NSC 102-2221-E-011-019-MY2.

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  1. Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei, 10607, Taiwan

    Cheng-Che Li & Dong-Hau Kuo

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  1. Cheng-Che Li
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  2. Dong-Hau Kuo
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Correspondence to Dong-Hau Kuo.

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Li, CC., Kuo, DH. Effects of growth temperature on electrical and structural properties of sputtered GaN films with a cermet target. J Mater Sci: Mater Electron 25, 1404–1409 (2014). https://doi.org/10.1007/s10854-014-1742-4

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  • DOI: https://doi.org/10.1007/s10854-014-1742-4

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