Papers by Author: W. Liu

Abstract: Applying the computer digital simulation program on the basis of numeric integration and the dynamic structural diagram, an improved method was put forward to the problem of PID control in the speed-varying feeding system, and the computer simulation experiment has been done for research.

Abstract: In this paper we have characterized the performance of a vertical metalorganic chemical vapor deposition (MOCVD) reactor used for deposition of ZnO thin films. The equations of the mathematical model are solved numerically using a control-volume-based finite difference method. A two-dimensional model is put forward to study the dependence of the growth rate on the inlet flow rate and susceptor temperature. The mass-fraction distribution of the reactants has been studied as a function of the position above the substrate, which shows that gas phase pre-reaction in our reactor is well confined. The simulation results are useful for the practical growth of ZnO.