Thermal Modeling and Analysis of Three- Dimensional (3d) Chip Stacks

Title of Thesis: Thermal Modeling and Analysis of Three-Dimensional (3D) Chip Stacks Christopher Bachmann, Master of Science, 2007-09-11 Thesis Directed by: Avram Bar-Cohen and Jungho Kim Mechanical Engineering Department Three-dimensional (3D) chip architectures have garnered much research interest because of their potential to alleviate the interconnect delay bottleneck that is expected to limit the traditional progression of Moore’s law through device scaling in planar chips. While the benefits of 3D chip integration are clear, there are several obstacles to its broader implementation. In particular, the issue of power dissipation is a major challenge to the development of high performance 3D chip stacks. The well-documented difficulties in cooling future 2D chips will only be exacerbated by 3D architectures in which volumetric power density is increased and non-uniform power dissipation is more severe. This thesis focuses on three relevant topics in the cooling of 3D chip stacks: 1) the determination of effective thermal properties for use in compact thermal models, 2) single phase internal liquid cooling, and 3) hot spot remediation with anisotropic thermal interface materials. THERMAL MODELING AND ANALYSIS OF THREEDIMENSIONAL (3D) CHIP STACKS