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    Stable Biexcitons In Two-Dimensional Metal-Halide Perovskites With Strong Dynamic Lattice Disorder

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    physrevmaterials.2.034001.pdf (1.521Mb)
    Date
    2018-03-08
    Author
    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
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    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 ± 5meV 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-processablematerials, in spite of the strong effects of lattice fluctuations and dynamic disorder.
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    http://hdl.handle.net/1853/60637
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