Affiliation: | a Analytical Engineering Laboratory, Samsung Advanced Institute of Technology, P.O. Box 111, Suwon 440-600, South Korea b Display Laboratory, Samsung Advanced Institute of Technology, P.O. Box 111, Suwon 440-600, South Korea c Department of Semiconductor Science and Technology, and Semiconductor Physics Research Center, Jeonbuk National University, Jeonju 561-756, South Korea |