The concept of ferroelectric polarons is proposed to partially explain the exceptional optoelectronic properties observed in lead halide perovskites (LHPs). It is intriguing but unclear how this proposal, which involves local or transient polarizations, applies in general to 2D LHPs with long-range ferroelectricity. Here, this work presents a pioneering time-domain experimental investigation of polarons in ferroelectric (IA)(MA)PbBr (IMPB; IA is isoamylammonium and MA is methylammonium) using transient absorption spectroscopy. Compared to non-ferroelectric LHPs, IMPB exhibits several distinct polaronic properties closely associated with macroscopic polarizations of ferroelectricity, including a prolonged polaron formation time (≈1.1 ps), a Stark splitting of the bleaching (≈63 meV), and a giant polaron Mott density (≈7.6 × 10 cm). These findings broaden the realm of 2D polaron systems and reveal the decisive role of static/unidirectional polarizations on polaron physics in 2D LHPs.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11578327 | PMC |
| http://dx.doi.org/10.1002/advs.202406885 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Defect related anomalous mobility of small polarons in dielectric oxides at the example of congruent lithium niobate.
Sci Rep
September 2024
Department of Mathematics/Informatics/Physics, Institute of Physics, University of Osnabrück, Barbarastraße 7, 49076, Osnabrück, Germany.
Polarons play a major role in the description of optical, electrical and dielectrical properties of several ferroelectric oxides. The motion of those particles occurs by elementary hops among the material lattice sites. In order to compute macroscopic transport parameters such as charge mobility, normal (i.
View Article and Find Full Text PDFAnomalous Polarons in Two-Dimensional Organometallic Perovskite Ferroelectric.
Adv Sci (Weinh)
November 2024
Laboratory for Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, 621900, China.
The concept of ferroelectric polarons is proposed to partially explain the exceptional optoelectronic properties observed in lead halide perovskites (LHPs). It is intriguing but unclear how this proposal, which involves local or transient polarizations, applies in general to 2D LHPs with long-range ferroelectricity. Here, this work presents a pioneering time-domain experimental investigation of polarons in ferroelectric (IA)(MA)PbBr (IMPB; IA is isoamylammonium and MA is methylammonium) using transient absorption spectroscopy.
View Article and Find Full Text PDFAnomalous Transport of Small Polarons Arises from Transient Lattice Relaxation or Immovable Boundaries.
J Phys Chem Lett
February 2024
Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States.
Elucidating transport mechanisms is crucial for advancing material design, yet state-of-the-art theory is restricted to exact simulations of small lattices with severe finite-size effects or approximate ones that assume the nature of transport. We leverage algorithmic advances to tame finite-size effects and exactly simulate small polaron formation and transport in the Holstein model. We further analyze the applicability of the ubiquitously used equilibrium-based Green-Kubo relations and nonequilibrium methods to predict charge mobility.
View Article and Find Full Text PDFstudy of the topological itinerant transport properties observed between excited edge states in a 2D compound with the MnBNi composition.
Phys Chem Chem Phys
December 2023
College of Science, Xi'an University of Science and Technology, Xi'an 710054, China.
Article Synopsis
- - The research investigates how the interaction between band inversion and spin-orbit coupling in 2D MnB affects its topological properties, using advanced computational methods including the GGA+U scheme and Wannier functions.
- - A key finding is that when band inversion is stronger than spin-orbit coupling, "twin" Weyl cones emerge in the band structure, leading to increased anomalous Hall conductivity (AHC) due to the coupling of Berry curvature and net magnetization.
- - Additionally, the study notes that the nickel (Ni) dopant contributes to dynamical antilocalization and generates strong spin waves for both spin orientations, as it interacts with the existing energy band inversion and SOC effects.
Anomalous Dependence of Photocarrier Recombination Time on the Polaron Density of TiO(110).
J Phys Chem Lett
September 2023
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Polarons play a crucial role in energy conversion, but the microscopic mechanism remains unclear since they are susceptible to local atomic structures. Here, by employing nonadiabatic dynamic simulations, we investigate electron-hole (e-h) nonradiative recombination at the rutile TiO(110) surface with varied amounts of oxygen vacancies (V). The isolated V facilitates e-h recombination through forming polarons compared to that in the defect-free surface.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!