Berlin 2018 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 18: Perovskite and Hybrid Photovolatics
HL 18.6: Talk
Tuesday, March 13, 2018, 10:45–11:00, EW 203
Circular structured Distributed Feedback Laser in Br based organic-anorganic perovskite — •Matthäus Jäckle1, Heiko Linnenbank1, Michael Saliba2, Mario Hentschel1, Michael Grätzel2, and Harald Giessen1 — 14th Physics Institute, University of Stuttgart — 2Laboratory of Photonics and Interfaces, École polytechnique fédérale de Lausanne
Organic-anorganic perovskites are direct semiconductors which are emerging as a new type of solution-processable semiconductors for optoelectronical applications. One particular interesting characteristic is that the bandgap can be tuned over the whole visible spectrum by using different halides. Most of the present research on perovskites is aimed at their usage as solar cells because of their high absorption rate and favorable material properties. However, recent scientific publications also employ these materials for light-emitting applications such as LEDs or Lasers. Based on the intense research in the solar cell community, lasing from Iodide containing perovskites has been recently presented. As this material is designed to absorb at visible wavelengths it will emit light at red or infrared wavelengths. In this work we will in contrast present stimulated emission of radiation from Bromide based structures, which radiate in the green part of the visible spectrum. We will demonstrate a circular distributed feedback (2D-DFB) laser, based on a lithographic structuring of the supporting substrate. This allows us to make use of the solution-processability of the perovskite as active material, as well as achieving a higher cofinment compared to previously presented 1D-DFB structures.