April 7 - 11, 2025
Seattle, Washington
Symposium Supporters
2025 MRS Spring Meeting & Exhibit
CH02.02.04

Using Circularly-Polarized Polarized Spectroscopy and Magnetic Field Effects to Study J Excitons in Hybrid Metal Halide Perovskites

When and Where

Apr 8, 2025
3:15pm - 3:45pm
Summit, Level 3, Room 343

Presenter(s)

Co-Author(s)

Bin Hu1

South China University of Technology1

Abstract

Bin Hu1

South China University of Technology1
Hybrid metal-halide perovskites are formed with J exciton carrying orbital and spin momentum. Essentially, the J excitons are responsible for generating optoelectronic outcomes such as light-emitting and photovoltaic properties in such hybrid perovskites. Importantly, using the orbital and spin momentum provides the fundamental capabilities to tune the optoelectronic properties. Here, we present that that circularly-polarized photoluminescence and pump-probe spectroscopy together with magnetic field effects provide deeper experimental methods to reveal the effects of orbital and spin momentum on the photoluminescence (PL) in hybrid metal-halide perovskites. We found that switching the photoexcitation between circular and linear polarizations can lead to different PL intensities, generating the so-called DPL phenomenon. This DPL phenomenon can elucidate how orbital polarizations are mutually interacting between excitons towards developing PL, ASE, and photovoltaic properties. On the other hand, applying a magnetic field can also change the PL intensity, leading to magnetic field effects of PL. We found that magnetic field effects of PL can reveal how spin momentum affects the intersystem crossing between different J states. This presentation will discuss and summarize the effects of orbital and spin momentum on the optoelectronic properties in hybrid metal halide perovskites by using circularly-polarized spectroscopy and magnetic field effects.

Keywords

in situ

Symposium Organizers

Tze Chien Sum, Nanyang Technological University
Yuanyuan Zhou, Hong Kong University of Science and Technology
Burak Guzelturk, Argonne National Laboratory
Mengxia Liu, Yale University

Symposium Support

Bronze
Ultrafast Systems LLC

Session Chairs

Mengxia Liu
Yuanyuan Zhou

In this Session