Advances in Two-Dimensional Layered Materials: From Excitonic Complexes to Optoelectronics

Dear Colleagues,

The optical properties of layered van der Waals materials have been a focal point of intense exploration, largely due to the prevalence of Coulomb-bound electron–hole pairs known as excitons. Even at room temperature, these excitons exhibit a significant presence owing to their substantial binding energy. While materials such as transition metal dichalcogenides (e.g., MoS₂, WSe₂), post-transition metal monochalcogenides (e.g., InSe), black phosphorus, and metal-halide perovskites (e.g., MAPbI₃) host Wannier excitons with radii exceeding the lattice parameters, magnetic chromium trihalides (e.g., CrBr₃) are characterized by Frenkel excitons that are notably smaller, often comparable to the unit cell size. The excitonic nature of these materials extends beyond fundamental experimental investigations employing techniques such as photoluminescence or absorption. It also defines electrically driven luminescence signals observed in optoelectronic devices. Understanding these aspects is pivotal for unraveling the basic optical hallmarks of layered materials. Moreover, integrating these materials into optical devices at the laboratory scale holds significant promise for future applications.

In line with this, our Special Issue, entitled “Advances in Two-Dimensional Layered Materials: From Excitonic Complexes to Optoelectronics”, seeks to comprehensively cover the spectrum of research on excitonic complexes in two-dimensional layered materials. Emphasizing both fundamental investigations and applied research on various devices, this Special Issue aims to provide a platform for disseminating cutting-edge developments in the field.

Dr. Maciej Molas
Dr. Magdalena Grzeszczyk
Guest Editors

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• transition metal dichalcogenides, MoS₂, ReS₂, WS₂, MoSe₂, ReSe₂, WSe₂, MoTe₂
• post-transition metal chalcogenides: GaS, InS, GaSe, InSe, GaTe, black phosphorous, silicene, germanene, hexagonal BN, layered perovskites, CsPbCl₃, (PEA)₂SnI₄, (PEA)₂PbI₄, (PEA)₂PbBr₄, (PEA)₂(MA)_n−1Pb_nI_3n+1, graphene, chromium halides, CrBr₃, CrCl₃, CrI₃
• excitons
• excitonic complexes
• emission
• up-conversion processes
• photoluminesce
• absorption
• electroluminescence
• optoelectronic devices
• tunneling diodes
• light-emitting devices
• band-gap engineering
• defect engineering
• carrier dynamics

• Excitons and Phonons in Two-Dimensional Materials: From Fundamental to Applications in Nanomaterials (10 articles)