1. Beneq Oy; Olarinluoma 9 02200 Espoo Finland
2. Department of Electronics and Nanoengineering, Aalto University; Tietotie 3 02150 Espoo Finland
3. Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU); Alfred Getz vei 2B 7491 Trondheim Norway