Low-Temperature Bonding of PZT (PbZrTiO3) and Flexible Printed Circuits Using Sn52In Solder Anisotropic Conductive Films for Flexible Ultrasonic Transducers

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Solder anisotropic conductive films (ACFs) consist of conductive solder particles, polymer resin, and flux activator. The flux activator removes solder oxide of solder particles by generated acid for the solder wetting during a thermocompression bonding process. In this article, eutectic Sn52In solder (Tm 118) particles were used as the conductive solder particle in the solder ACFs to reduce 130 ACFs' bonding temperature. Novel Sn52In solder ACFs were fabricated using a comma-roll film coater and used to interconnect Au-coated PZT (PbZrTiO3) and flexible printed circuits (FPCs). PZT and FPCs interconnects using Sn52In solder ACFs were successfully demonstrated with the formation of good solder joints and reliable electrical resistances. According to the energy-dispersive spectrometer (EDS) line scan analysis, excellent solder wetting was confirmed by the presence of Au-In and Ni-Sn intermetallic compounds (IMCs) at the PZT and FPCs interface. Sn52In solder ACFs' joints showed no open-circuit failure due to the excellent metallurgical bonding during a pressure cooker test (100 relative humidity and 2 atm at 121) and a dynamic bending reliability test (the minimum bending radius of 7 mm). Therefore, Sn52In solder ACFs' bonding can provide excellent metallurgical interconnection for flexible ultrasonic transducer packaging.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2019-11
Language
English
Article Type
Article
Citation

IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY, v.9, no.11, pp.2152 - 2159

ISSN
2156-3950
DOI
10.1109/TCPMT.2019.2945016
URI
http://hdl.handle.net/10203/268813
Appears in Collection
MS-Journal Papers(저널논문)
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