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Elkins MH, Pensack R, Proppe AH, Voznyy O, Quan LN, Kelley SO, Sargent EH, Scholes GD. Biexciton Resonances Reveal Exciton Localization in Stacked Perovskite Quantum Wells. J Phys Chem Lett 2017; 8:3895-3901. [PMID: 28767258 DOI: 10.1021/acs.jpclett.7b01621] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
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.
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Affiliation(s)
- Madeline H Elkins
- Department of Chemistry, Princeton University , Princeton, New Jersey 08544 United States
| | - Ryan Pensack
- Department of Chemistry, Princeton University , Princeton, New Jersey 08544 United States
| | - Andrew H Proppe
- Department of Electrical and Computer Engineering, University of Toronto , Toronto, Ontario M5S 3G4, Canada
- Department of Chemistry, University of Toronto , Toronto, Ontario M5S 3G4, Canada
| | - Oleksandr Voznyy
- Department of Electrical and Computer Engineering, University of Toronto , Toronto, Ontario M5S 3G4, Canada
| | - Li Na Quan
- Department of Electrical and Computer Engineering, University of Toronto , Toronto, Ontario M5S 3G4, Canada
| | - Shana O Kelley
- Department of Chemistry, University of Toronto , Toronto, Ontario M5S 3G4, Canada
| | - Edward H Sargent
- Department of Electrical and Computer Engineering, University of Toronto , Toronto, Ontario M5S 3G4, Canada
| | - Gregory D Scholes
- Department of Chemistry, Princeton University , Princeton, New Jersey 08544 United States
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Cameron AR, Riblet P, Miller A. Spin gratings and the measurement of electron drift mobility in multiple quantum well semiconductors. PHYSICAL REVIEW LETTERS 1996; 76:4793-4796. [PMID: 10061382 DOI: 10.1103/physrevlett.76.4793] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
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Spiegel R, Bacher G, Herz K, Forchel A, Litz T, Waag A, Landwehr G. Recombination and thermal emission of excitons in shallow CdTe/Cd1-xMgxTe quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:4544-4548. [PMID: 9984010 DOI: 10.1103/physrevb.53.4544] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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