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Research Abstracts Online
January - December 2011

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University of Minnesota Twin Cities
College of Science and Engineering
Department of Chemical Engineering and Materials Science

PI: Jeffrey J. Derby, Fellow

Materials Processing Fundamentals

These researchers develop, implement, and apply large-scale numerical simulations to understand processes that are used for the production of advanced solid-state materials. Of particular interest are processes employed for the growth of single crystals. These studies aim to understand factors that directly affect materials properties and production costs. The researchers have studied the growth of electronic and photonic inorganic materials via a number of melt and flux growth methods, as well as organic crystallization from the solution phase. Current materials of interest include silicon for photovoltaic applications and semiconductor (most notably cadmium telluride and cadmium zinc telluride) and scintillator crystals for radiation detectors employed in national security and medical imaging applications. Process models are developed using the mathematical depiction of continuum transport (incompressible flows, heat and mass transfer), phase-change, and other interfacial phenomena. These models are solved using finite element methods, using both two-dimensional and three-dimensional implementations for steady-state and transient analyses. Continuation methods are often employed in bifurcation analyses as a paradigm to understand process behavior. A continuing challenge is the development of effective and robust parallel implementations for the accurate solution of three-dimensional, incompressible flows that are characteristic of the crystal growth systems of interest. The researchers are developing and employing a number of parallel, finite element models for these purposes.

Group Members

Oren Bass, National Building Research Institute, Technion, Israel Institution of Technology, Haifa, Israel
Parthiv Daggolu, Graduate Student
Wei Wang, Graduate Student
Andrew Yeckel, Research Associate
Nan Zhang, Graduate Student