Biexciton Resonances Reveal Exciton Localization in Stacked Perovskite Quantum Wells

Madeline H. Elkins, Ryan Pensack, Andrew H. Proppe, Oleksandr Voznyy, Li Na Quan, Shana O. Kelley, Edward H. Sargent, Gregory D. Scholes

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


Quasi-two-dimensional lead halide perovskites, MAn-1PbnX3n+1, are quantum confined materials with an ever-developing range of optoelectronic device applications. Like other semiconductors, the correlated motion of electrons and holes dominates the material's response to optical excitation influencing its electrical and optical properties such as charge formation and mobility. However, the effects of many-particle correlation have been relatively unexplored in perovskite because of the difficultly of probing these states directly. Here, we use double quantum coherence spectroscopy to explore the formation and localization of multiexciton states in these materials. Between the most confined domains, we demonstrate the presence of an interwell, two-exciton excited state. This demonstrates that the four-body Coulomb interaction electronically couples neighboring wells despite weak electron/hole hybridization in these materials. Additionally, in contrast with inorganic semiconductor quantum wells, we demonstrate a rapid decrease in the dephasing time as wells become thicker, indicating that exciton delocalization is not limited by structural inhomogeneity in low-dimensional perovskite.

Original languageEnglish (US)
Pages (from-to)3895-3901
Number of pages7
JournalJournal of Physical Chemistry Letters
Issue number16
StatePublished - Aug 17 2017

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Physical and Theoretical Chemistry


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