Abstract
In this paper, the thermal stability of Ni-germanide is improved by utilizing Ni/Co/Ni/TiN structure for Ge metal–oxide–semiconductor field effect transistors (MOSFETs) technology. It was shown that the Ni/Co/Ni/TiN structure improved the thermal stability of Ni-germanide mainly due to the suppression of Ni diffusion, and/or the retardation of agglomeration. The incorporated Co atoms distributed, mainly in the top region of the Ni-germanide and it is believed that this Co-rich Ni-germanide layer in the upper region of Ni-germanide enhanced the thermal stability. Therefore, the proposed Ni/Co/Ni/TiN structure is promising for the formation of a highly thermally immune Ni-germanide for nanoscale Ge MOSFETs technology.
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