1. Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California91125, United States
2. Liquid Sunlight Alliance, California Institute of Technology, Pasadena, California91125, United States
3. Department of Physics, University of California, Berkeley, Berkeley, California94720, United States
4. Liquid Sunlight Alliance, Lawrence Berkeley National Laboratory, Berkeley, California94720, United States
5. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California94720, United States
6. Kavli Energy NanoSciences Institute, University of California, Berkeley, Berkeley, California94720, United States