Phase transformation of Ni-B, Ni-P diffusion barrier deposited electrolessly on Cu interconnect |
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Authors: | Jae Woong Choi Gil Ho Hwang |
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Institution: | Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Republic of Korea |
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Abstract: | In this paper, we report that the phase transformation of Ni-B, Ni-P diffusion barriers deposited electrolessly on Cu, for the reason that the Ni-P layer is a more effective diffusion barrier than the Ni-B layer. The Ni3B crystallized was decomposed to Ni and B2O3 above 400 °C and the Ni3P crystallized was decomposed to Ni and P2O5 above 600 °C respectively in Ar atmosphere. Also, the Ni3B was decomposed to Ni and free B above 400 °C and the Ni3P was decomposed to Ni and free P above 600 °C respectively in H2 atmosphere. The decomposed Ni formed a solid solution with Cu. The Cu diffusion occurred above 400 °C for Ni-B layer and above 600 °C for Ni-P layer, respectively. Because the decomposition temperature of Ni-P layer is about 200 °C higher than that of Ni-B layer, the Ni-P layer is a more effective barrier for Cu than the Ni-B layer. |
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Keywords: | Ni-B Ni-P Cu interconnect Diffusion barrier Ni3B and Ni3P decomposition |
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