Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 30: Poster: Organic Electronics and Photovoltaics

CPP 30.9: Poster

Dienstag, 8. März 2016, 18:15–21:00, Poster B2

Light-coupling and light trapping in periodically structured thin-film solar cells — Thomas Pfadler and •Lukas Schmidt-Mende — Universität Konstanz

Periodically structured TiO2 electrodes are introduced to thin-film photovoltaics to tackle the typically partial light absorption. Arising consequences on light management in such thin-film solar cells are elucidated. Wavelength-scale patterns are transferred to the electron-selective TiO2 bottom electrodes via direct laser interference patterning. In the main absorption region of the employed photoactive materials, the efficiency of the structure-induced light in-coupling is spectroscopically shown to be determined by the refractive index n(active material) with respect to n(TiO2). Beside the elucidation of light in-coupling in the main absorption region of the photoactive material, structure-induced light-trapping effects targeting at a resonant enhancement of the very weak tail-state absorption present in polymer:fullerene BHJ solar cells are additionally investigated. The presented approach paves the way to potentially close the gap between net optical and electric band gap of organic solar cells, which is stated as an intrinsic energy loss mechanism in donor-acceptor systems. Furthermore, fully vectorial electromagnetic simulations using the Discontinuous Galerkin Time Domain method were performed to obtain time-averaged Poynting vectors along with spatially resolved dependencies of the power loss densities. The simulations underline the experimental findings and further outline the tuneability of the absorption resonances towards arbitrary wavelength regions.