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SUMMARY:Electronic properties of functional molecules
DTSTART:20260409T170000
DTEND:20260409T183000
DTSTAMP:20260413T110908Z
UID:9903cf13bd2e7a708816c0e473e058453e32ca1cf0780edf80004a91
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Petra Tegeder\nFor improvement and optimization of the p
 erformance of organic molecule-based devices\, such as photovoltaic cells 
 and thin-film transistors comprehensive insight into the physical and chem
 ical properties of the organic molecules at surfaces is necessary. N-heter
 opolycyclic aromatic compounds are promising candidates for n-channel semi
 conductors. The introduction of nitrogen atoms into the p-backbone of the 
 polycyclic aromatic hydrocarbons stabilizes the frontier orbitals and incr
 eases the electron affinity\, while the size of the HOMO−LUMO (optical) 
 gap is nearly unaffected. By using two-photon photoemission spectroscopy (
 2PPE) and high resolution electron energy loss spectroscopy (HREELS) we de
 termined quantitatively transport\, singlet and triplet states as well as 
 electronic spectra of serval N-heteropolycyclic molecules adsorbed on Au(1
 11) [1-4]. Moreover their nonlinear optical properties such as the two-pho
 ton absorption (2PA) ability have been investigated [5\, 6]. Using time-re
 solved 2PPE we gained insights into the exciton dynamics and resolved proc
 esses on the femtosecond to picosecond timescale [2]. In addition\, transi
 ent absorption (TA) spectroscopy has been applied to illuminate the excite
 d state dynamics of orthogonal photoswitches and pentacene embedded in a s
 urface anchored metal organic framework (SURMOF) [7\, 8].\n \n \n\n\n© 
 2026 EPFL\n\n\n\nReferences:\n[1]  M. Ajdari\, R. Pappenberger\, C. Annwe
 iler\, T. Kaczun\, L. Müller\, L. Winkelmann\, L. Ahrens\, U. Bunz\, A. D
 reuw\,\nP. Tegeder\, J. Phys. Chem. C\, 128 (2024) 4060.\n[2]  J. Steidel
 \, I. Michalsky\, M. Ajdari\, M. Kivala\, P. Tegeder\, Phys. Chem. Chem. P
 hys.\, 26 (2024) 16454.\n[3]  M. Ajdari\, R. Pappenberger\, I. Michalsky\
 , F. Maass\, M. Kivala\, A. Dreuw\, P. Tegeder\, J. Phys. Chem. C\, 128 (2
 024) 14399.\n[4]  J. Steidel\, I. Michalsky\, M. Kivala\, P. Tegeder\, Ph
 ys. Chem. Chem. Phys.\, 28 (2026) 6208.\n[5]  K. Fuchs\, N. Oberhof\, G. 
 Sauter\, A. Pollien\, K. Brödner\, F. Rominger\, J. Freudenberg\, A. Dreu
 w\, P. Tegeder U. H. F. Bunz\, Angew. Chem. Int. Ed.\, 63 (2024) e202406
 384.\n[6]  G. Sauter\,  A. Papapostolou\, A. Pollien\, S. Boschmann\, K.
  Fuchs\, P. Merten\, K. Brödner\, F. Rominger\, J. Freudenberg\, U. H. F.
  Bunz\,  A. Dreuw\, P. Tegeder\, Angew. Chem. Int. Ed.\, 23 (2025) e2025
 03073.\n[7]  T. Schmitt\, L.-Y. Hsu\, N. Oberhof\, D. Rana\, A. Dreuw\, E
 . Blasco\, P. Tegeder\, Adv. Funct. Mater.\, 34\, (2024) 2300863.\n[8]  M
 . Richter\, M. J. Kariyottukuniyil\, Z. Xu\, P. Ludwig\, P. V. Kolesnichen
 ko\, C. Huck\, U. Bunz\, C. Wöll\, W. Wenzel\, P. Tegeder\, Adv. Opt. Mat
 er.\, 14 (2026) e02979.\n\n 
LOCATION:CH G1 495 https://plan.epfl.ch/?room==CH%20G1%20495
STATUS:CONFIRMED
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