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Vacuum-Based Picking-up and Placing-on

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Modeling and Application of Flexible Electronics Packaging

Abstract

This chapter mainly focuses on the modeling and optimization of the chip picking-up and placing-on, including the processes of the chip picking-up through the vacuum adsorption, roll-to-roll (R2R) processing, and thermal-compressing-based ultra-thin chip-on-flex (UTCOF) packaging, and is organized as follows. Analytical models of the chip-adhesive-substrate structure subjected to the vacuum adsorption were first proposed to investigate the mechanism of the chip picking-up based on hypotheses of constant and variable lengths of the substrate. Effects of the vacuum adsorption pressure (VAP), the type of the picking-up head, and the picking-up displacement were analyzed to improve the capability of the chip detachment along the adhesive layer. A process optimization was carried out to ensure the complete chip detachment. After picking-up, the chip placing-on determines the reliability of the packaged system. The chip placing-on was then theoretically investigated by integration with the R2R processing. Effects of material properties, geometric dimensions, and process temperatures were explored. An optimization approach was presented to reduce the interfacial residual stress. Last, in consideration of the adhesive thickness approximating to the thickness of the ultra-thin chip and flexible substrate, the warpage of the UTCOF assembly was predicted by using a layerwise-model combining subdivided mathematical plies.

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Huang, Y., Yin, Z., Wan, X. (2019). Vacuum-Based Picking-up and Placing-on. In: Modeling and Application of Flexible Electronics Packaging. Springer, Singapore. https://doi.org/10.1007/978-981-13-3627-0_9

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  • DOI: https://doi.org/10.1007/978-981-13-3627-0_9

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-13-3626-3

  • Online ISBN: 978-981-13-3627-0

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