1. Nanomaterials for Energy Laboratory, Department of Energy Science, Sungkyunkwan University, Suwon 440-746, Republic of Korea
2. R&D Tech Division, 28th Floor Seoul Parnas Tower, 521, Teheran-ro, Gangnam-Gu, Seoul 06164, Korea
3. Advanced Display Research Center (ADRC), Department of Information Display, Kyung Hee University, 26, Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, South Korea
4. Laboratoire de Physique des Interfaces et des Couches Minces (LPICM), Ecole Polytechnique, Palaiseau 91128, France