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We thank S. Jeong for deposition of amorphous Si. We also appreciate the helpful comments on the manuscript from Z. Beiley and A. Jackson. A portion of this work was supported by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231, Subcontract NO. 6951379 under the Batteries for Advanced Transportation Technologies (BATT) Program. A portion of this work was also supported by the Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under contract DE-AC02-76SF0051, through the SLAC National Accelerator Laboratory LDRD project. Y.C. acknowledges support from the ONR Young Investigator Award and the King Abdullah University of Science and Technology (KAUST) Investigator Award (No. KUS-l1-001-12). M. T. M. acknowledges the National Defense Science and Engineering Graduate Fellowship, the National Science Foundation Graduate Fellowship, and the Chevron Stanford Graduate Fellowship for funding and support.