BRIGE: Morphological Effects on Low Temperature, Pressureless Sintering of Ag Nanostructures: A New Pb-free Alternative for High Temperature and High Power Interconnections

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。布里奇奖的研究目标是研究银（Ag）纳米结构的影响。环境友好型无铅无压烧结工艺的形态学进展。该项目成功的关键是通过多元醇工艺对形状控制的银纳米结构的合成进行了表征，这可能导致非稳定晶的成核，这将有利于低温烧结反应的进展，从而产生介孔导电膜。本研究的具体目标是：1)探索工艺参数对多元醇合成的影响，并建立其与银纳米结构形貌的相关性；2)建立模型，控制银纳米结构的几何特征作为关键合成参数的函数；3)建立形貌对低温无压烧结过程进展的影响。如果成功，这项研究的结果将为下一代高功率电子设备的开发提供关键的使能技术，例如用于混合动力汽车，公共电网以及替代能源的控制和转换。通过这种技术成功地获得连续的导电银膜，将使传统的回流工艺得以摆脱，传统的回流工艺将应用温度限制在附着材料熔点的一小部分。此外，这种高温，高功率互连的无铅替代品支持社会？美国对环保技术的需求。该项目的技术目标与其开展研究项目以扩大波多黎各-马亚圭斯大学（UPRM）西班牙裔工程专业学生的参与和机会的扩展目标紧密相关。该奖项将鼓励这些学生参与独立的学术研究。最后，该奖项将通过提供资金和指导资源，部分赞助upm高中学生机械工程夏令营。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).The research objective of this BRIGE award is to investigate the effect of silver (Ag) nanostructures? morphology on the progression of an environmentally benign lead-free, pressureless sintering process. Key to the success of the project is the characterization of shape-controlled synthesis of Ag nanostructures by polyol process that could lead to the nucleation of non-stable crystallites that will favor the progression of a low temperature sintering reaction resulting in mesoporous conductive film. The specific aims of the proposed work are: 1) explore the effect of process parameters on polyol synthesis and establish a correlation with the resulting morphology of Ag nanostructures; 2) develop a model to control the geometrical features of Ag nanostructures as a function of critical synthesis parameters; 3) establish the effect of morphology on the progression of a low temperature, pressureless sintering process. If successful, the results of this research will provide a key enabling technology for the development of next generation high power electronics such as those used in hybrid-electric vehicles, public power grids, as well as control and conversion for alternative energy sources. Successful achievement of a continuous, conductive Ag film by this technique will enable a departure from the traditional reflow process which restricts the application temperature to a fraction of the melting point of the attach material. Further, this lead-free alternative for high temperature, high power interconnections support society?s need for environmentally benign technologies. The technical objective of the project is integrally related to its outreach goal to initiate a research program to broaden the participation and increase the opportunities of Hispanic engineering students at the University of Puerto Rico-Mayaguez (UPRM). This award will encourage the engagement of these students independent scholarly research. Lastly, this award will partially sponsor the UPRM Mechanical Engineering Summer Camp for high school students by providing financial and mentoring resources.