Ultrafast photophysics of metal halide perovskite multiple quantum wells: Device implications and reconciling band alignment

Andrew Proppe, Madeline H. Elkins, Rafael Quintero-Bermudez, Arup Mahata, Shana O. Kelley, Filippo De Angelis, Gregory D. Scholes, Edward H. Sargent

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Metal halide perovskite quantum wells (QWs) have been used to fabricate efficient optoelectronic devices, and exhibit stability superior to that of their bulk 3D counterparts. The perovskite QWs are tuned in synthesis so that they possess different bandgaps and exciton binding energies owing to variable quantum confinement as a function of QW thickness. Accordingly, the device performance of these materials depends on the efficiency of various interwell carrier dynamical processes, principally exciton and charge transfer. I will discuss the use of transient absorption and ultrafast two-dimensional electronic spectroscopy to probe interwell exciton transfer on timescales of 100s of femtoseconds, and show that interwell charge transfer occurs on timescales of 10s to 100s of picoseconds. These results, in addition to photoelectron spectroscopy experiments, are used to reconcile conflicting observations of type-I and type-II band alignment amongst perovskite QWs.

Original languageEnglish (US)
Title of host publicationPhysical Chemistry of Semiconductor Materials and Interfaces XVIII
EditorsChristian Nielsen, Daniel Congreve, Hugo A. Bronstein, Felix Deschler
PublisherSPIE
ISBN (Electronic)9781510628618
DOIs
StatePublished - Jan 1 2019
EventPhysical Chemistry of Semiconductor Materials and Interfaces XVIII 2019 - San Diego, United States
Duration: Aug 11 2019Aug 13 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11084
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferencePhysical Chemistry of Semiconductor Materials and Interfaces XVIII 2019
CountryUnited States
CitySan Diego
Period8/11/198/13/19

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Keywords

  • Band alignment
  • Charge transfer
  • Energy transfer
  • Perovskite
  • Photovoltaics
  • Quantum well
  • Ultrafast dynamics

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