Berlin 2018 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 13: Poster Session I
HL 13.54: Poster
Monday, March 12, 2018, 17:30–19:30, Poster B
Charge Transfer at the Interface of Indoline Dye/ZnO Solar Cells — •Nico Hofeditz1, Ingo Meyenburg1, Raffael Rueß2, Derck Schlettwein2, and Wolfram Heimbrodt1 — 1Department of Physics and Material Sciences Center, Philipps-University Marburg, Renthof 5, 35032 Marburg, Germany — 2Institute of Applied Physics, Justus-Liebig-University Gießen, Heinrich-Buff-Ring 16, 35392 Gießen, Germany
Dye-sensitized solar cells containing mesoporous ZnO and the indoline dyes D131 and DN216 have been prepared either with an iodide/triiodide or with a cobalt-based redox electrolyte with different concentrations of 4-tert-butylpyridine (TBP). The TBP additive reduces the acidity of the cobalt redox electrolyte. An important process in high efficient dye-sensitized solar cells is an optimized electron transfer, i.e., the electron injection yield from the dye into the conduction band of the ZnO at the organic-inorganic interface. We studied the photoluminescence intensity as well as the decay time of the dyes by varying the applied voltage. We were able to reveal the electron transfer times from the excited dye by analyzing the photoluminescence transients of the excitons after femtosecond excitation and applying kinetic model calculations. We will compare both dyes and show that the level alignment and the number of anchoring groups have a strong influence on the charge transfer. Furthermore, we discuss in our contribution the influence of cell aging as well as the influence of dye aggregation on the charge transfer times, i.e., electron injection efficiency.