Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 11: Poster: Hybrid and Perovskite Photovoltaics

CPP 11.18: Poster

Montag, 7. März 2016, 18:15–21:00, Poster B2

Charge Transport Properties in Perovskite Photovoltaic Devices Incorporating Carbon Nanotube Hole Transport Layers — Andrew Rowberg, Matthias Handloser, Kathrin Bader, Pablo Docampo, and •Achim Hartschuh — Ludwig-Maximilians-Universität München, München, Deutschland

Hybrid thin-film perovskite photovoltaic devices have attracted considerable interest due to their high efficiency and affordable fabrication. [1] However, the small molecule spiro-OMeTAD, the most often used hole transporting material in perovskite devices, suffers from a poor intrinsic charge mobility. Networks of semiconducting carbon nanotubes (s-CNTs), which possess excellent charge mobility properties, [2] offer a potential replacement and have been demonstrated as hole-transport layers in lead halide perovskite devices. [3] However, the mechanisms behind the functionality of perovskite devices incorporating s-CNT networks have not been thoroughly explored. This work examines the intrinsic charge transport properties in such devices through laser excitation at unique wavelengths corresponding to the absorption of each layers. A confocal optical microscope is used to raster-scan the samples or detection positions for fixed excitation and to generate photoluminescence (PL) maps, while charge carrier decay and transport dynamics are studied on the sub-nanosecond scale by time-correlated single photon counting (TCSPC) through rapid pulsed laser excitation.

[1] Hodes, G. et al. Nat. Phot. 8, 87-88 (2014). [2] Jariwala, D. et al. Chem. Soc. Rev. 42, 2824-2860 (2013). [3] Habisreutinger, S. et al. Nano Lett. 14, 5561-5568 (2014).