English
The ion beam source acquired allows the incorporation of low-energy hydrogen ions in several technologically relevant materials. The system operates under vacuum conditions and permit a tight control over the ion beam energy and current.
The source can be exploited in a wide range of materials, from insulatora and semicondutors to metals.
Fonte di Finanziamento:
Media o grande attrezzatura acquisita/cofinanziata con fondi di Ateneo
anno del bando:
2020
anno di collaudo:
2022
Name and acronym of the laboratory or room hosting the Infrastructure:
SPECTRO-MICROSCOPY LABORATORY (SMART)
Department or host center:
Building:
CU013 - Fisica - Guglielmo Marconi Scienze Matematiche Fisiche e Naturali
Laboratory / Infrastructure web page:
Servizi offerti:
We provide ion beam irradiation with ion energy ranging from 10 eV to 1200 eV with a high reproducibility. The treatment tempeature can be varied from room temperature to 500 °C. The treatments are performed in an ultra-high-vacuum enviroment.
Contatti:
| surname | name | |
|---|---|---|
Polimeni | Antonio |
Numero di utenti per anno:
5
Dipartimenti interessati:
Elenco Imprese utenti:
Elenco altri utenti:
Ricavi - trasferimenti interni:
Anno:
2021
fatture emesse:
| data |
|---|
01/03/2021 |
spese manutenzione:
| anno |
|---|
2021 |
Description of research activity:
The equipment will be employed in several research activites mainly focussed on innovative materials and advanced structruring of the electronic and structural properties of those materials from the bulk to the nanometer scale.
A large part of the research activity will be devoted to semiconductor materials and nanostructures. In dilute nitrides, for example -as discovered by the research group of the proposer- H implantation leads to the formation of stable N-H complexes [Fel18]. This fully neutralizes the effects of N on the structural and electronic properties of these materials, resulting, for example, in a large, fully tunable redshift of their energy gap. This provides a simple route to the on-chip generation of single photons via the fabrication of site-controlled GaAsN/GaAsN:H quantum dots (QDs), by H irradiation of lithographically prepatterned samples, or by spatially selective H removal. This activity will be also relevant for a recently funded ERC Starting Grant by Dr. De Luca researcher at the Physics Department. The ERC project aims at realization of QDs in nanowires by using hydrogen irradiation.
Hydrogenation of two-dimensional layers is also a strategic pathway to tune the electronic and optical properties of transition metal dichalcogenided, a class of emerging low dimensional materials with extraordinary transport and mechanical properties. For example, the proposer's group recently discovered that the exposure of bulk TMD flakes to H+ ions results in the formation of atomically thin micro- and nanobubbles on the sample surface. The process of dome formation, which is uniform across the sample surface, can therefore be employed to optically activate bulk TMDs over macroscopic regions, drastically improving upon the sizes typical of mechanically exfoliated monolayers.
Recently, Prof. Betti and other members of the Physics Department reported the possibility of opening a gap in semimetallic graphene by H irradiation. H anchoring to graphene distorts the sp2 hybridization towards an sp3 configuration.
Another activity focuses
Scientific coordinator:
antonio.polimeni@uniroma1.it
ERC scientific sector:
PE4_5
PE3
Ambiti tecnologici trasversali - Key Enabling Technologies:
Nanotechnologies
Keyword iris:
2D nanomaterials
complex surface
Infrastructure status:
In funzione