Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 61: Focus: Fundamental Physics of Perovskites II - organized by Lukas Schmidt-Mende and Vladimir Dyakonov

CPP 61.5: Vortrag

Donnerstag, 15. März 2018, 10:45–11:00, C 130

Revealing the impact of Rubidium and Cesium on the electronic trap landscape of mixed cation perovskite solar cells via thermally stimulated current — •Philipp Rieder¹, Yinghong Hu³, Alexander Hufnagel³, Meltem Aygüler³, Michiel Petrus³, Pablo Docampo⁴, Kristofer Tvingstedt¹, Andreas Baumann², Thomas Bein³, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, University of Würzburg, 97074 Würzburg — ²ZAE Bayern, 97074 Würzburg — ³Department of Chemistry and Center for NanoScience (CeNS), LMU Munich, 81377 Munich — ⁴Physics Department, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom

In the last years, mixed cation and halide organo-lead perovskite has established itself as the working horse in the perovskite community, due its improved crystallization behavior and therefore reproducible high power conversion efficiencies (PCE) achieved in various solar cell configurations. Recently, this so-called "FAMA" perovskite, whereas methylammonium (MA) and bromide is used to stabilize the crystal structure of formamidinium (FA) lead iodide perovksite, could be further improved by the introduction of small amounts of Rb as well as Cs, boosting the device PCE up to 21.6%, while additionally enhancing the long-term stability. Here, we use thermally stimulated current (TSC) spectroscopy to study the beneficial impact of Cs and/or Rb on the FAMA crystal lattice by directly probing the electronic trap landscape in what has been come to be known as triple and quadruple cation perovskite solar cells.