1. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
2. Center for Electronic Materials, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea
3. Operando Methodology and Measurement Team, Interdisciplinary Materials Measurement Institute, Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Korea
4. Department of Applied Chemistry, Andong National University, Andong 36728, Korea
5. Materials & Production Engineering Research Institute, LG Electronics, Pyeongtaek-si 17709, Korea