Regensburg 2016 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 90: Poster III

HL 90.19: Poster

Thursday, March 10, 2016, 16:00–19:00, Poster A

Electrical Characterization of Methylammonium Tin Iodide Layers as Photovoltaic Absorbers — •Jonas Horn, Manuel Weiss, Christoph Richter, and Derck Schlettwein — Justus-Liebig-Universität Gießen, Institut für Angewandte Physik, Heinrich-Buff-Ring 16, D-35392 Gießen, Germany.

The preparation of absorber layers composed of methylammonium tin iodide (CH₃NH₃SnI₃) in a two-step process was investigated. The material may serve as a less toxic alternative to CH₃NH₃PbI₃ as active material in perovskite solar cells. Tin(II) iodide layers prepared by physical vapor deposition on microstructured Au electrode arrays on SiO₂/Si were converted to CH₃NH₃SnI₃ by reaction with a spin-coated solution of methylammonium iodide. The perovskite particles were over 200 nm in size and the films reached almost complete surface coverage. The material absorbs over a broad part of the solar spectrum, broader even than CH₃NH₃PbI₃. An average resistivity of 26 Ohm cm was measured, characteristic of semiconducting rather than metallic CH₃NH₃SnI₃, which speaks in favor of the suitability for photovoltaic applications. The excellent stability of the resistivity, at least within the inert atmosphere of the glove box, and the independently proven stability of the film structure even after contact to air show the good prospects for applications as absorber layers in perovskite solar cells.