Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 2: Focus Session: Structural Ordering and Electronic Transport I (jointly with CPP)
HL 2.8: Vortrag
Montag, 26. März 2012, 12:15–12:30, ER 270
Investigations of charge generation, transport and recombination on organic solar cells based on merocyanines — •Steven Graf1, Vera Steinmann1, Nils Kronenberg1, Martin Lenze1, Dirk Hertel1, Frank Würthner2, and Klaus Meerholz1 — 1Institut für Physikalische Chemie, Universität zu Köln, Luxemburger Str. 116, 50939 Köln (Germany) — 2Institut für Organische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg
Organic photovoltaics offer a very promising green energy alternative. Highly efficient organic solar cells can be produced by cost-effective methods such as coating from solution (SOL) or depositing under high vacuum conditions (VAC).
We investigate merocyanines (MC), a class of low-molecular-weight colorants, as donor material in organic solar cells. These molecules are processable via both deposition techniques, showing remarkable power conversion efficiencies (PCE) beyond 4% for SOL- and 6% for VAC-processed devices.
Towards even higher PCEs it is imperative to gain a better understanding of the fundamental processes of charge carrier generation, transport and recombination in MC solar cells. We carried out a detailed study of these processes using steady- state and time-resolved photoluminescence spectroscopy and current-voltage measurements. The influence of morphology on fundamental processes is elucidated by varying the deposition conditions as well as the fabrication method. The investigations are supported by temperature- and electric-field-dependent studies of charge recombination and transport.