1. Separation and Conversion Materials Laboratory; Korea Institute of Energy Research; Daejeon 305-343 Republic of Korea
2. DRAM Process Architecture Team; Samsung Electronics; Hwaseong 18448 Republic of Korea
3. Photovoltaic Laboratory; Korea Institute of Energy Research; Daejeon 305-343 Republic of Korea
4. Graduate School of Energy Science and Technology; Chungnam National University; Daejeon 305-764 Republic of Korea