Segregation during Bridgman crystal growth in space with an axial magnetic field

N. Ma¹ - J. S. Walker²

¹ Department of Mechanical & Aerospace Engineering & Engineering Mechanics, University of Missouri at Rolla, 1870 Miner Circle, Rolla, MO 65409 USA
² Department of Mechanical & Industrial Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, IL 61801 USA

Abstract
This paper treats the mass transport of a dilute dopant during the growth of a semi-conductor crystal by the Bridgman process in space. An axial magnetic field damps the buoyant convection driven by the residual acceleration. The unsteady mass transport problem is treated for the entire period of time to grow the crystal by us-ing asymptotic solutions for the temperature and melt velocity. The results show that essentially diffusion-controlled mass transport can be achieved with quite mod-est magnetic fields. Fig. 1, Refs 5.