Dresden 2011 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
TT: Fachverband Tiefe Temperaturen
TT 7: SC: Properties, Electronic Structure, Mechanisms 2
TT 7.8: Talk
Monday, March 14, 2011, 15:45–16:00, HSZ 301
Electronic properties of molecular picene — •M. Grobosch1, F. Roth1, B. Mahns1, M. Gatti2, P. Cudazzo2, B. Büchner1, A. Rubio2, and M. Knupfer1 — 1IFW Dresden, D-01069 Dresden, Germany — 2Nano-Bio Spectrocopy Group and ETSF Scientific Development Centre, Dpto. Física de Materiales Universidad del País Vasco, Av. Tolosa, E-20018 San Sebastían, Spian
We have studied the electronic properties of molecular picene by a combination of accurate experimental (photoemission spectroscopy, absorption spectroscopy) and theoretical spectroscopy to get a deeper insight into the occupied and unoccupied electronic states of this recently discovered organic semiconductor. By means of combined photoelectron spectroscopy (XPS, UPS) we have determined the ionization potential of solid picene to be 6.4 eV and a work function of 4.4 eV, i.e. picene is rather stable against oxidation. The first occupied electronic levels of picene are quite close in energy and the onset of the electronic DOS is at about 2 eV below the chemical potential indicating a quite large band gap of solid picene. The C1s excitation data of solid picene measured using EELS compared to the unoccupied electronic DOS calculated in the GW approximation are in very good agreement if GW corrections are taken into account.