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Title: Stable biexcitons in two-dimensional metal-halide perovskites with strong dynamic lattice disorder
Authors: Thouin, Félix
Neutzner, Stefanie
Cortecchia, Daniele
Dragomir, Vlad Alexandru
Soci, Cesare
Salim, Teddy
Lam, Yeng Ming
Leonelli, Richard
Petrozza, Annamaria
Kandada, Ajay Ram Srimath
Silva, Carlos
Keywords: Biexcitons
Issue Date: 2018
Source: Thouin, F., Neutzner, S., Cortecchia, D., Dragomir, V. A., Soci, C., Salim, T., . . . Silva, C. (2018). Stable biexcitons in two-dimensional metal-halide perovskites with strong dynamic lattice disorder. Physical Review Materials, 2(3), 034001-. doi:10.1103/PhysRevMaterials.2.034001
Series/Report no.: Physical Review Materials
Abstract: With strongly bound and stable excitons at room temperature, single-layer, two-dimensional organic-inorganic hybrid perovskites are viable semiconductors for light-emitting quantum optoelectronics applications. In such a technological context, it is imperative to comprehensively explore all the factors—chemical, electronic, and structural—that govern strong multiexciton correlations. Here, by means of two-dimensional coherent spectroscopy, we examine excitonic many-body effects in pure, single-layer (PEA)2PbI4 (PEA = phenylethylammonium). We determine the binding energy of biexcitons—correlated two-electron, two-hole quasiparticles—to be 44 ± 5 meV at room temperature. The extraordinarily high values are similar to those reported in other strongly excitonic two-dimensional materials such as transition-metal dichalcogenides. Importantly, we show that this binding energy increases by ∼25% upon cooling to 5 K. Our work highlights the importance of multiexciton correlations in this class of technologically promising, solution-processable materials, in spite of the strong effects of lattice fluctuations and dynamic disorder.
DOI: 10.1103/PhysRevMaterials.2.034001
Rights: © 2018 American Physical Society. All rights reserved. This paper was published in Physical Review Materials and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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