1. Department of Electrical and Computer Engineering and Inter-University Semiconductor Research Center; Seoul National University; 1 Gwanak-ro Gwanak-gu Seoul 08826 South Korea
2. IoT Convergence Research Department; Electronics and Telecommunications Research Institute; 218 Gajeong-ro Yuseong-gu Daejeon 34129 South Korea
3. Department of Physics and Centre for Plastic Electronics; Imperial College London; South Kensington Campus London SW7 2AZ UK
4. Chemistry Division; Los Alamos National Laboratory; Los Alamos NM 87545 USA
5. Soft I/O Interface Research Section; Electronics and Telecommunications Research Institute; 218 Gajeong-ro Yuseong-gu Daejeon 34129 South Korea
6. Departments of Electrical Science and Physics, Mathematical, Physical and Life Science Division; University of Oxford; Oxford OX1 3PD UK