1. Niroo Research Institute, Chemistry and Materials DivisionNon‐Metallic Materials Group Tehran 1468613113 Iran
2. Department of PhysicsNanophysics Research LaboratoryUniversity of Tehran Tehran 14395‐547 Iran
3. Electrical and Computer EngineeringNational University of Singapore Singapore 119260 Singapore
4. Low Energy Electronic Systems (LEES)Singapore‐MIT Alliance for Research and Technology (SMART) Centre Singapore 138602 Singapore
5. Institute of Materials Research and EngineeringAgency for Science, Technology and Research (A*STAR) 2 Fusionopolis Way, Innovis, #08‐03 Singapore 138634 Singapore
6. Institute of Materials ScienceTechnical University of Darmstadt Alarich‐Weiss‐Strasse 2 Darmstadt D‐64287 Germany
7. Helmholtz Young Investigator Group FRONTRUNNER IEK5‐Photovoltaik, Forschungszentrum Jülich D‐52425 Germany