1. Molecular Foundry; Lawrence Berkeley National Laboratory; Berkeley CA 94720 USA
2. Department of Physics; University of California Berkeley; Berkeley CA 94720 USA
3. Joint Center for Artificial Photosynthesis; Lawrence Berkeley National Laboratory; Berkeley CA 94720 USA
4. Joint Center for Artificial Photosynthesis; California Institute of Technology; Pasadena CA 91125 USA
5. Environmental Energy Technologies Division; Lawrence Berkeley National Laboratory; Berkeley CA 94720 USA
6. Kavli Energy NanoSciences Institute; Berkeley CA 94720 USA