HEИндивидуална стипендия2023–2025

FAJANS · Effective fabrication of 2D TMDs with the aid of in-situ microscopy

„Хоризонт Европа“ — Действия „Мария Склодовска-Кюри“

Период: 2023-09-01 → 2025-09-30
Финансиране от ЕС: 166 279 €
Участници: 1
Схема: HORIZON-TMA-MSCA-PF-EF

Линиите свързват координатора с партньорите.

Накратко на български

Двуизмерните Janus материали са слоеве от атоми, при които горният и долният слой от халкогени (например сяра и селен) са различни. Тези структури помагат за развитието на по-добри сензори, фотодетектори и системи за преобразуване на енергията.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Effective fabrication of 2D TMDs with the aid of in-situ microscopy

Janus 2D TMDs (Janus two-dimensional transition metal dichalcogenides) represent an innovative class of 2D materials composed of a single atomic layer in which the chalcogen atoms above and below the central metal layer are different, forming an asymmetric X–M–Y structure (where M is the transition metal, such as Mo or W, and X and Y are chalcogens like S, Se, or Te). This broken out-of-plane mirror symmetry induces an internal perpendicular electric field, resulting in unique properties such as piezoelectric polarization, pyroelectricity, and Rashba spin–orbit coupling, with promising applications in sensors, photodetectors, spintronic devices, and energy conversion systems. The synthesis of these structures involves the selective substitution of one chalcogen layer in conventional TMDs through processes such as controlled sulfurization or selenization, electron beam irradiation, or thermal treatment in reactive atmospheres (such as H2S). These transformations, often influenced by strain, also modulate optical and electronic properties, making Janus materials highly versatile for future applications in nanoelectronics and catalysis. The main goals of the project include the successful fabrication of Janus 2D TMDs and the identification of their characteristic vibrational and optical signatures. The Raman and PL studies will provide key insights into how structural defects, chalcogen substitution, and thermal processing influence material quality. These findings will help advance the understanding of the physical properties and fabrication mechanisms of Janus TMDs.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

Two-dimensional (2D) Janus transition metal dichalcogenides (Janus 2D TMD) are specific planar materials with different top and bottom termination layers. This new class of materials thus exhibits broken structural symmetry in the out-of-plane direction, predicted to result in exotic new properties, such as vertical piezoelectricity, Rashba spin splitting and unexpected exciton behavior. However, fabrication of Janus 2D TMD is an extremely challenging task, owing to the need of an epitaxial atomic replacement within classical 2D TMD. This project is designed to achieve chalcogenide exchange within classical TMDs by two novel approaches. In the first approach, we will utilize an electron beam as tool to alter the top layer, allowing its selective selenization/sulfurization. In the second approach, we aim to utilize increased reactivity in the van der Waals gap to allow for selective chalcogenide exchange within the gap. This requires careful set of experimental conditions. These will be sought with in-situ electron microscopy, which allows to overcome the common experimental ""black box"" approach. Data from in-situ microscopy allow to determine kinetic constants, potentially allowing to generate general growth protocols for Janus TMDs. The growth will be followed analysis of structural, optical and electrical properties of the grown materials. The proposal builds on an established know how of the Host institution (CEITEC) and the Supervisor (Miroslav Kolibal), providing the Aplicant (Estácio Paiva de Araújo) with relevant scientific training, as well as widening his skillset via Career Development Plan. The project emphasizes the two-way knowledge transfer; the Applicant is expected to bring both the scientific know-how, as well as to open new ways to communicate the results to the different audiences and, as such, increase the visibility of CEITEC within the scientific community and general public.""

Оригинален текст от CORDIS (на английски).

Участници

VYSOKE UCENI TECHNICKE V BRNE · BRNO STREDКоординаторЧехия