Effects of Polyacrylonitrile Anchoring Polymer Layer Solder Anisotropic Conductive Films on the Solder Ball Movement for Fine-Pitch Flex-on-Flex (FOF) Assembly

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In this paper, anchoring polymer layer (APL) solder anisotropic conductive films (ACFs) combined with an ultrasonic (US) bonding method are newly introduced. The effects of APL ACFs properties on conductive particle movement and interconnection stability for ultrafine-pitch chip-on-glass applications were reported earlier. It was found that the APL structure not only suppresses the conductive particles movement during the ACFs bonding process for ultrafine-pitch applications, but also prevents electrical short-circuit formation between neighboring bumps. However, to achieve a stable electrical interconnection, APL ACFs require additional process steps such as an oxygen plasma etch process to remove the APL polymer skins surrounding the conductive particles using a thermocompression bonding method. However, during the US bonding process, it was found that the polyacrylonitrile (PAN) polymer skin coated on conductive particles was successfully removed by vertical directional US vibration. Therefore, stable and metallurgical solder joint formation can be achieved without an additional oxygen plasma etching process.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2019-05
Language
English
Article Type
Article
Citation

IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY, v.9, no.5, pp.830 - 835

ISSN
2156-3950
DOI
10.1109/TCPMT.2019.2909095
URI
http://hdl.handle.net/10203/262262
Appears in Collection
MS-Journal Papers(저널논문)
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