1. Department of Applied
Physics and Materials Science, California Institute of Technology, Pasadena, California 91125, United States
2. Resnick Sustainability Institute, California Institute of Technology, Pasadena, California 91125, United States
3. Kavli Nanoscience
Institute, California Institute of Technology, Pasadena, California 91125, United States
4. Joint Center for Artificial Photosynthesis, California Institute of Technology, Pasadena, California 91125, United States