Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 65: Poster: Organic electronics and photovoltaics (CPP; jointly with HL, O)

HL 65.15: Poster

Mittwoch, 13. März 2013, 16:30–18:30, Poster C

Charge generation in solid-state dye-sensitized solar cells using peryleneimide sensitizers — •Yoojin Kim, Michael Meister, Ian Howard, Felix Hinkel, Glauco Battagliarin, Chen Li, Klaus Müllen, and Frédéric Laquai — Max Planck Institute for Polymer, Mainz, Germany

Solid-state dye-sensitized solar cells (DSCs) have attracted a lot of attention owing to their advantages compared to liquid-electrolyte DSCs such as ease of fabrication and the absence of corrosive electrolytes that are typically used in liquid-electrolyte cells. However, fast charge recombination between electrons in the titania nanoparticle films and dye/hole conductor cations, incomplete pore-filling, and the decreased thickness of titania films necessary for efficient charge extraction currently limit the power conversion efficiency. In this contribution we compare the charge generation and recombination processes in a series of peryleneimide-sensitized DSCs studied by steady-state photoinduced absorption (PIA) and ultrafast broadband transient absorption spectroscopy (TAS) covering the sub-picosecond to millisecond timerange. By fitting the dynamics to a photophysical model we extract the parameters relevant for the photovoltaic efficiency such as the yield of electron injection and the recombination rate constants which allows us to derive meaningful structure-property relations.