1. Department of Physics and Soft Materials Research Center, University of Colorado, Boulder, Colorado 80309, United States
2. Departamento de Fı́sica, Faculdade de Ciências, Universidade de Lisboa, 1649-004 Lisboa, Portugal
3. Centro de Fı́sica Teórica e Computacional, Universidade de Lisboa, 1649-004 Lisboa, Portugal
4. Department of Electrical, Computer, and Energy Engineering, Materials Science and Engineering Program, University of Colorado, Boulder, Colorado 80309,United States
5. Renewable and Sustainable Energy Institute, National Renewable Energy Laboratory and University of Colorado, Boulder, Colorado 80309,United States