1. Functional Ceramics Group Korea Institute of Materials Science (KIMS) Changwon 51508 Republic of Korea
2. Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea
3. Bio‐inspired Materials and Devices Laboratory (BMDL) Center for Energy Harvesting Materials and Systems (CEHMS) Virginia Tech Blacksburg VA 24061 USA
4. CSIR‐National Physical Laboratory Dr. K. S. Krishnan Road New Delhi 110012 India