1. Physics Department, Universidade Tecnológica Federal do Paraná, 80230-901 Curitiba, Brazil
2. Institut für Physik & IRIS Adlershof, Humboldt Universität zu Berlin, 12489 Berlin, Germany
3. Berlin Joint EPR Lab and Institut für Experimentalphysik, Freie Universität Berlin, 14195 Berlin, Germany
4. School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics (COPE), Georgia Institute of Technology, 30332 Atlanta, Georgia, United States
5. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 12489 Berlin, Germany