1. Molecular Electronics
and Photonics Research Unit, Department of Mechanical Engineering
and Materials Science and Engineering, Cyprus University of Technology, 3041 Limassol, Cyprus
2. Departments of Engineering Science and Physics, Division
of Mathematical, Physical and Life Sciences, University of Oxford, Oxford OX1 3PD, U.K.
3. Institute
for Materials in Electronics and Energy Technology, Friedrich-Alexander University Erlangen-Nuremberg, 91054 Erlangen, Germany