Scalable production of single 2D van der Waals layers through atomic layer deposition: bilayer silica on metal foils and films
Abstract
The self-limiting nature of atomic layer deposition (ALD) makes it an appealing option for growing single layers of two-dimensional van der Waals (2D-VDW) materials. In this paper it is demonstrated that a single layer of a 2D-VDW form of SiO2 can be grown by ALD on Au and Pd polycrystalline foils and epitaxial films. The silica was deposited by two cycles of bis(diethylamino) silane and oxygen plasma exposure at 525 K. Initial deposition produced a three-dimensionally disordered silica layer; however, subsequent annealing above 950 K drove a structural rearrangement resulting in 2D-VDW. The annealing could be performed at ambient pressure. Surface spectra recorded after annealing indicated that the two ALD cycles yielded close to the silica coverage obtained for 2D-VDW silica prepared by precision SiO deposition in ultra-high vacuum (UHV). Analysis of ALD-grown 2D-VDW silica on a Pd(111) film revealed the co-existence of amorphous and incommensurate crystalline 2D phases. In contrast, ALD growth on Au(111) films produced predominantly the amorphous phase while SiO deposition in UHV led to only the crystalline phase, suggesting that the choice of Si source can enable phase control.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 10, 2022
- Source ID
- 10.1088/2053-1583/ac5005
Entities
People
- Andreas Hütten
- Chao Zhou
- Daniil Naberezhnyi
- Eric I Altman
- Gregory S Hutchings
- Inga Ennen
- Jesse H Hsu
- Nassar Doudin
- Petr Dementyev
- Shu Hu
- Udo D Schwarz
- Xin Shen
- Zachary S Fishman
Organizations
- Army Research Office
- National Science Foundation
- Office of Naval Research