Investigation of the effects of LIFT printing with a KrF-excimer laser on thermally sensitive electrically conductive adhesives
Investigation of the effects of LIFT printing with a KrF-excimer laser on thermally sensitive electrically conductive adhesives
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研究使用 KrF 准分子激光进行 LIFT 打印对热敏导电粘合剂的影响
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
H. Schoo
中科院分区：
文献类型：
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作者：
S. M. Perinchery;E. Smits;A. Sridhar;P. Albert;J. van den Brand;R. Mandamparambil;I. Yakimets;H. Schoo
激光诱导前向转移是一种新兴的材料沉积技术。我们研究了这项技术在使用和不使用中间动态脱模层的情况下打印热敏导电胶的可行性。使用248nmKrF准分子激光打印了含银片的环氧基导电胶，其网点尺寸为75μm。该工艺对于实现与微电子工业中的表面贴装设备的电连接特别相关。通过傅里叶变换红外光谱、四点电学测量、模切试验和温度冲击试验对印刷材料进行了表征，确定了胶粘剂的性能不受直接或间接激光照射的影响。激光不会降解到粘合剂上，这证实了这项技术在互连应用中的潜力。
Laser induced forward transfer is an emerging material deposition technology. We investigated the feasibility of this technique for printing thermally sensitive, electrically conductive adhesives with and without using an intermediate dynamic release layer. A 248 nm KrF-excimer laser was used to print the epoxy-based conductive adhesives containing silver flakes down to 75 μm dot size. The process is particularly relevant for realizing electrical connections to surface mount devices in the microelectronics industry. Characterization of the printed materials was analyzed by Fourier transform infrared spectroscopy, four-point electrical measurements, die-shear testing and temperature shock testing, to establish that the properties of the adhesive were not affected by direct or indirect laser irradiation. The lack of degradation by the laser onto the adhesives confirms the potential of this technique for interconnection applications.