1. Reality Devices Research Division Electronics and Telecommunications Research Institute (ETRI) 218 Gajeongno, Yuseong‐gu Daejeon 34129 Republic of Korea
2. Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST) 333 Techno Jungang‐daero, Hyeonpung‐eup, Dalseong‐gun Daegu 42988 Republic of Korea