Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jallcom.2009.05.136
Title: Characterization and reliability study of low temperature hermetic wafer level bonding using In/Sn interlayer and Cu/Ni/Au metallization
Authors: Yu, D.-Q.
Lee, C. 
Yan, L.L.
Thew, M.L.
Lau, J.H.
Keywords: Hermeticity
In-Sn
Intermetallic compound
Low-temperature bonding
WLP
Issue Date: 19-Oct-2009
Source: Yu, D.-Q., Lee, C., Yan, L.L., Thew, M.L., Lau, J.H. (2009-10-19). Characterization and reliability study of low temperature hermetic wafer level bonding using In/Sn interlayer and Cu/Ni/Au metallization. Journal of Alloys and Compounds 485 (1-2) : 444-450. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jallcom.2009.05.136
Abstract: Low temperature hermetic wafer bonding using In/Sn solder interlayer and Cu/Ni/Au metallization was investigated for microelectromechanical system (MEMS) packaging application. The thin Ni layer was used as a buffer layer to control the diffusion process between solder interlayer and Cu. Bonding was performed in a vacuum wafer bonder at 180 and 150 °C for 20 min with a pressure of 5.5 MPa. It was found that bonding at 180 °C, voids free joints composed of high temperature intermetallic compounds (IMCs) were obtained with good hermeticity. However, bonding at 150 °C, voids were generated along the seal joint which caused poor hermeticity comparing with that bonded at 180 °C. Four types of reliability tests, i.e., pressure cooker test, high humidity storage, high temperature storage and temperature cycling test were performed to evaluate the reliability of the seal joints bonded at 180 °C. In the failed dies, the propagation of crack along bonding line was found. The possible failure mechanism was discussed, and feasible improvement methods were proposed. © 2009 Elsevier B.V. All rights reserved.
Source Title: Journal of Alloys and Compounds
URI: http://scholarbank.nus.edu.sg/handle/10635/55269
ISSN: 09258388
DOI: 10.1016/j.jallcom.2009.05.136
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