학술논문
Rapid Spin Depolarization in the Layered 2D Ruddlesden-Popper Perovskite (BA)(MA)PbI.
Document Type
Academic Journal
Author
Kempf MA; Institute of Physics, Rostock University, 18059 Rostock, Germany.; Moser P; Walter Schottky Institute, TUM School of Natural Sciences, Technical University of Munich, 85748 Garching, Germany.; Tomoscheit M; Institute of Physics, Rostock University, 18059 Rostock, Germany.; Schröer J; Institute of Physics, Rostock University, 18059 Rostock, Germany.; Blancon JC; Department of Chemical and Biomolecular Engineering, Rice University, 6100 Main St., Houston, Texas 77005-1827, United States.; Schwartz R; Institute of Physics, Rostock University, 18059 Rostock, Germany.; Deb S; Institute of Physics, Rostock University, 18059 Rostock, Germany.; Mohite A; Department of Chemical and Biomolecular Engineering, Rice University, 6100 Main St., Houston, Texas 77005-1827, United States.; Stier AV; Walter Schottky Institute, TUM School of Natural Sciences, Technical University of Munich, 85748 Garching, Germany.; Finley JJ; Walter Schottky Institute, TUM School of Natural Sciences, Technical University of Munich, 85748 Garching, Germany.; Korn T; Institute of Physics, Rostock University, 18059 Rostock, Germany.
Source
Publisher: American Chemical Society Country of Publication: United States NLM ID: 101313589 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1936-086X (Electronic) Linking ISSN: 19360851 NLM ISO Abbreviation: ACS Nano Subsets: PubMed not MEDLINE; MEDLINE
Subject
Language
English
Abstract
We report temperature-dependent spectroscopy on the layered ( n = 4) two-dimensional (2D) Ruddlesden-Popper perovskite (BA)(MA)PbI. Helicity-resolved steady-state photoluminescence (PL) reveals no optical degree of polarization. Time-resolved PL shows a photocarrier lifetime on the order of nanoseconds. From simultaneously recorded time-resolved differential reflectivity (TRΔR) and time-resolved Kerr ellipticity (TRKE), a photocarrier lifetime of a few nanoseconds and a spin relaxation time on the order of picoseconds was found. This stark contrast in lifetimes clearly explains the lack of spin polarization in steady-state PL. While we observe clear temperature-dependent effects on the PL dynamics that can be related to structural dynamics, spin relaxation is nearly T -independent. Our results highlight that spin relaxation in 2D (BA)(MA)PbI occurs at time scales faster than the exciton recombination time, which poses a bottleneck for applications aiming to utilize this degree of freedom.