Stable biexcitons in two-dimensional metal-halide perovskites with strong dynamic lattice disorder

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 fact...

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Veröffentlicht in:arXiv.org
Hauptverfasser: Thouin, Félix, Neutzner, Stefanie, Cortecchia, Daniele, Vlad Alexandru Dragomir, Soci, Cesare, Salim, Teddy, Lam, Yeng Ming, Leonelli, Richard, Petrozza, Annamaria, Ajay Ram Srimath Kandada, Silva, Carlos
Format: Paper
Sprache:Englisch
Veröffentlicht: Ithaca Cornell University Library, arXiv.org 12.02.2018
Schlagworte:
Binding energy
Correlation
Dimensional stability
Excitation spectra
Excitons
Optoelectronics
Organic chemistry
Perovskites
Transition metals
Two dimensional materials
Variation
ISSN:2331-8422
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Zusammenfassung: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 multi-exciton correlations. Here, by means of two-dimensional coherent spectroscopy, we examine excitonic many-body effects in pure, single-layer (PEA)\(_2\)PbI\(_4\) (PEA = phenylethylammonium). We determine the binding energy of biexcitons --- correlated two-electron, two-hole quasiparticles --- to be \(44 \pm 5\)\,meV at room temperature. The extraordinarily high values are similar to those reported in other strongly excitonic two-dimensional materials such as transition-metal dichalchogenides. Importantly, we show that this binding energy increases by \(\sim25\)\% upon cooling to 5\,K. Our work highlights the importance of multi-exciton correlations in this class of technologically promising, solution-processable materials, in spite of the strong effects of lattice fluctuations and dynamic disorder.
Bibliographie:SourceType-Working Papers-1
ObjectType-Working Paper/Pre-Print-1
content type line 50
ISSN:2331-8422
DOI:10.48550/arxiv.1712.04733