Berlin 2005 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 35: Hybride Systeme
HL 35.1: Vortrag
Samstag, 5. März 2005, 15:45–16:00, TU P-N226
Sensitization of silicon thin films by dye molecules — •Christian Kelting1, Ulrich Weiler2, Thomas Mayer2, Dieter Wöhrle3, Ossamah Abdallah4, and Derck Schlettwein1 — 1Institut für Angewandte Physik, Justus-Liebig-Universität Giessen, D-35390 Giessen — 2FG Oberflächenforschung, FB Material- und Geowissenschaften, Technische Universität Darmstadt, D-64287 Darmstadt — 3Institut für Organische und Makromolekulare Chemie, Universität Bremen, D-28334 Bremen — 4Abteilung für Solare Energetik, Hahn-Meitner-Institut, D-14109 Berlin
The use of Si-dye hybrid materials in the intrinsic layer of thin film solar cells is expected to increase the light harvesting efficiency and hence also the conversion efficiency. En route to such materials phthalocyanine (Pc) molecules have been vapour-deposited on Si wafers (hydrogen terminated by HF etching), microcrystalline Si and amorphous Si prepared by a hot-wire CVD technique. Films from monolayer coverage up to 20 nm of unsubstituted (PcZn) and fluorinated zinc complexes of Pc were studied. The growth of these strongly absorbing materials was investigated by UV-Vis spectroscopy. After the alignment of the energy levels of PcZn and the fluorinated derivatives has been deduced from UPS studies the present measurements are focussed on photoconduction measurements at the films to study an injection of charge carriers from the excited dye molecules to Si.