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School of Semiconductor and Chemical Engineering, Chonbuk National University, Chonju 561-756, Korea

School of Semiconductor and Chemical Engineering and Semiconductor Physics Research Center, Chonbuk National University, Chonju 561-756, Korea

School of Semiconductor and Chemical Engineering, Chonbuk National University, Jeonju 561-756, Korea

School of Semiconductor and Chemical Engineering, Chonbuk National University, Jeonju 561-756, Korea

School of Semiconductor and Chemical Engineering, Chonbuk National University, Jeonju 561-756, Korea

School of Semiconductor and Chemical Engineering, Chonbuk National University, Jeonju 561-756, Korea

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