Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

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: Vortrag

Mittwoch, 14. März 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. Brabec^{3, 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.