Details

Autor(en) / Beteiligte

• Usevi ius, Gediminas
• Tur ak, Justinas
• Zhang, Yuxuan
• Eggeling, Andrea
• Einoryt, yginta
• Hope, Michael Allan
• Svirskas, Šar nas
• Klose, Daniel
• Kalendra, Vidmantas
• Aidas, Kestutis
• Jeschke, Gunnar
• Banys, J ras
• Šim nas, Mantas

Titel

Probing structural and dynamic properties of MAPbCl hybrid perovskite using Mn EPR

Ist Teil von

• Dalton transactions : an international journal of inorganic chemistry, 2024-04, Vol.53 (17), p.7292-732

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Hybrid methylammonium (MA) lead halide perovskites have emerged as materials exhibiting excellent photovoltaic performance related to their rich structural and dynamic properties. Here, we use multifrequency (X-, Q-, and W-band) electron paramagnetic resonance (EPR) spectroscopy of Mn 2+ impurities in MAPbCl 3 to probe the structural and dynamic properties of both the organic and inorganic sublattices of this compound. The temperature dependent continuous-wave (CW) EPR experiments reveal a sudden change of the Mn 2+ spin Hamiltonian parameters at the phase transition to the ordered orthorhombic phase indicating its first-order character and significant slowing down of the MA cation reorientation. Pulsed EPR experiments are employed to measure the temperature dependences of the spin-lattice relaxation T 1 and decoherence T 2 times of the Mn 2+ ions in the orthorhombic phase of MAPbCl 3 revealing a coupling between the spin center and vibrations of the inorganic framework. Low-temperature electron spin echo envelope modulation (ESEEM) experiments of the protonated and deuterated MAPbCl 3 analogues show the presence of quantum rotational tunneling of the ammonium groups, allowing to accurately probe their rotational energy landscape. First comprehensive EPR study of Mn 2+ ion incorporation in lead halide hybrid perovskites. We use these ions as local probes to study the structural and dynamic properties of MAPbCl 3 .