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 48.6: Talk

Wednesday, March 14, 2018, 16:45–17:00, C 130

Investigation of Photon Recycling in Perovskites by Spatially-Resolved Confocal Photoluminescence — •Milena Merkel², Liudmila Kudriashova¹, Valentin Baianov², Simon Berger¹, Georgy V. Astakhov¹, Andreas Baumann², and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — ²Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg

Methylammonium lead iodide (MAPI) perovskites were shown to combine long diffusion lengths (up to 10 µm) with high carrier recombination rates (∼10⁶ s⁻¹). Coexistence of these competing properties can be explained by efficient interplay between photons and electron-hole pairs in the perovskite film with multiple absorption-diffusion-emission events occurring, namely by photon recycling. Here we implement confocal double-objective photoluminescence (PL) spectroscopy to study the photon recycling in MAPI. Analysis of steady-state PL spectra at various distances from excitation spot was performed. We show that photon recycling takes place in thin MAPI films, while its efficiency strongly depends on film morphology defined by preparation approach. Additionally, we discuss here the observed light-soaking effects.