1. Department
of Physics, Wake Forest University, Winston-Salem, North Carolina 27109, United States
2. School
of Chemistry and Biochemistry and Center for Organic Photonics and
Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
3. CSIRO Manufacturing Flagship, Private Bag 10, Clayton South MDC, Victoria 3169, Australia
4. MX
Beamlines, Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria 3168, Australia
5. Solar
and Photovoltaics Engineering Research Center, Division of Physical
Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia