Cu/TiN薄膜間の付着力に対するTi膜の効果 [in Japanese] Effect of Ti Film against the Adhesion between Cu and TiN Film [in Japanese]
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The effect of Ti film inserted as an adhesion promoting layer in a Cu/Ti/TiN structure was studied. A Ti film 15nm thick clearly promoted adhesion, to a level four times that of a Cu/TiN structure, but the effect of a Ti film 80nm in thickness was not clear. The difference in effectiveness appears to be related to the structure of the Ti. The hydrogen included in the annealing atmosphere was occluded in the 80nm Ti, leading it to change to Ti hydride; TiH<sub>1.924</sub>. Ti hydride is known to be a brittle material. Even though it includes hydrogen, however, the 15nm Ti film does not change to Ti hydride and has a fcc structure, according to the results of high resolution TEM and electron diffraction. The 15nm thick Ti is thought to have an extremely strong effect as an adhesion layer, because Ti hydride is not generated in the Ti film.
- Jitsumu Hyomen Gijutsu
Jitsumu Hyomen Gijutsu 48(4), 439-445, 1997-04-01
The Surface Finishing Society of Japan