1. Department of Electrical and Computer Engineering, University of California Santa Cruz, Santa Cruz, California 95064, USA
2. Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, USA and School of Natural Sciences, University of California Merced, Merced, California 95343, USA
3. Organic Bioelectronics Laboratory, Biological and Environmental Science and Engineering (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
4. Department of Biomedical Engineering and Simpson Querrey Institute, Northwestern University, Evanston, Illinois 60208, USA