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dc.contributor.authorAgrawal, Megha-
dc.contributor.authorManohar, Bottumanchi Morish-
dc.contributor.authorNagarajaiah, Kusuma-
dc.identifier.issn0975-1017 (Online); 0971-4588 (Print)-
dc.description.abstractCopper (Cu) is used as an interconnect material in many applications owing to its high thermal, electrical conductivity and excellent electromigration resistance. Though this material has many advantages, the main drawback is that it gets oxidized on exposure to air. Thermo-compression bonding is a wafer bonding technique that uses metal layers for heaping wafers, which aids in attaining outstanding electrical conductivity without weakening the mechanical properties. The adsorbed oxide layer hurdles the proper bonding to happen between the wafers. In order to enhance the diffusion between the metal layers, the copper oxide layer should be removed which necessitates the requirement of high temperature, pressure, long bonding time and the inert gas atmosphere throughout the Cu-Cu thermo compression wafer bonding process. Simultaneous application of high temperature and pressure for a long time leads to the deterioration of the underlying sensitive components. This paper aims to present several techniques such as surface treatment, chemical pretreatment, surface passivation, crystal orientation modification, stress gradient in the thin film and formic acid vapour treatment which are used in order to avoid the deterioration of underlying sensitive devices and to obtain a proper bonding between the wafers at low temperature and pressure.en_US
dc.publisherCSIR-NIScPR, Indiaen_US
dc.sourceIJEMS Vol.28(2) [April 2021]en_US
dc.subjectThermocompression bondingen_US
dc.subjectSurface treatmenten_US
dc.subjectSurface passivationen_US
dc.subjectFormic acid vapour treatmenten_US
dc.titleCu-Cu thermo compression wafer bonding techniques for micro-system integrationen_US
dcterms.publisherCSIR-NIScPR, India
Appears in Collections:IJEMS Vol.28(2) [April 2021]

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