Berlin 2008 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 36: Poster III
HL 36.19: Poster
Wednesday, February 27, 2008, 16:30–19:00, Poster D
The Local Electronic Structure of planar versus non planar Phthalocyanines (ZnPc, SnPc and PbPc) studied byResonant Soft X-ray Emission Spectroscopies — •nikolaos peltekis1, brendan holland1, louis piper2, alex demasi2, kevin smith2, ignatius mcgovern1, and cormac mcguinness1 — 1School of Physics, Trinity College Dublin, Dublin 2,Ireland. — 2Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA
The electronic structure of thin films of the organic molecular semiconductors: zinc phthalocyanine (ZnPc), tin phthalocyanine (SnPc) and lead phthalocyanine (PbPc) have been investigated by soft x-ray spectroscopy. Near edge x-ray absorption fine structure (NEXAFS) spectra, together with resonant & non-resonant soft x-ray emission (RSXE and SXE) spectra have been measured at the carbon and nitrogen K edges. The resultant spectra measure the unoccupied and occupied carbon and nitrogen 2p projected density of states respectively. In particular, resonant soft x-ray emission spectroscopy results in the site-specific C 2p and N 2p local partial density of states(LPDOS) being measured. An angular dependence of the C 2p and N 2p RSXE spectra of ZnPc, SnPc and PbPc has been observed. The observed angular dependence,the measured LPDOS and their correspondence to the results of density functional calculations will be discussed. Comparison between planar (ZnPc) and non planar (SnPc, PbPc) phthalocyanine along with the differing stacking arrangement of molecules within ZnPc (planar) and SnPc-PbPc (non-planar) crystalline films will be discussed.