Abstract
In semiconductor manufacturing, the process is more complicated than other manufacturing processes. For example, in LED epitaxial wafer manufacturing, which has large fluctuations and it is still not stable to control the specification of product in current. However, due to the uncertain output distribution, to predict the total production time is very difficult. This problem affects the delivery time of product and the customer service satisfaction. However, for manufacturers, to decide the amount of each manufacturing technique before production, is a critical to minimize the total production time. In this paper, we develop a mathematical model to characterize the problem in LED epitaxial wafer manufacturing. Based on the mathematical model, we use the simulation optimization technique to construct the response surface and use a metamodel form to characterize the objective function. We also solve this model and derive the optimal inputs that can achieve minimum the total production time. An empirical study is conducted to verify the viability of the proposed model in real settings.