Berlin 2018 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 48: Focus: Fundamental Physics of Perovskites I - organized by Lukas Schmidt-Mende and Vladimir Dyakonov
CPP 48.9: Talk
Wednesday, March 14, 2018, 17:30–17:45, C 130
Circular photogalvanic effect in single-crystal (CH3NH3)PbI3 — •Daniel Niesner1, Martin Hauck2, Shreetu Shrestha3, Ievgen Levchuk3, Gebhard J. Matt3, Andres Osvet3, Miroslaw Batentschuk3, Christoph J. Brabec3, 4, Heiko B. Weber2, and Thomas Fauster1 — 1Lehrstuhl für Festkörperphysik, Univ. of Erlangen-Nürnberg, Staudtstr. 7, D-91058 Erlangen, Germany — 2Lehrstuhl für Angewandte Physik, Univ. of Erlangen-Nürnberg, Staudtstr. 7, D-91058 Erlangen, Germany — 3Institute of Materials for Electronics and Energy Technology (I-MEET), Univ. of Erlangen-Nürnberg, Martensstr. 7, D-91058 Erlangen, Germany — 4Bavarian Center for Applied Energy Research (ZAE Bayern), Haberstr. 2a, D-91058 Erlangen, Germany
The mechanisms underlying the remarkable phototransport properties of organic-inorganic perovskite compounds (OIPCs), such as carrier diffusion lengths > 1 µm despite the moderate carrier mobilities, remain a matter of ongoing debate. Rashba and Dresselhaus spin-splittings have been predicted to enhance both carrier lifetimes and electron-acoustic-phonon coupling. Spin-splittings at the surface of an OIPC were measured using photoelectron spectroscopy, but little information exists to quantify their occurrence in bulk material. In a system with spin-split bands, the direction of diffusive photocurrents excited with circularly polarized light is reversed when the helicity of the light is changed. The phenomenom is known as the circular photogalvanic effect. We demonstrate this effect in (CH3NH3)PbI3 single-crystal devices and discuss its relationship to optical properties.