期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 27, 页码 14557-14562出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b01297
关键词
air stability; oxidation; black phosphorus; XPS
资金
- ARC Laureate Fellowship [FL120100038]
- Singapore National Research Foundation, Prime Minister's Office, Singapore [R-144-000-295-281]
- National Research Foundation, Prime Minister's Office, Singapore under its Competitive Research Programme (CRP) [NRF-CRP9-2011-3]
- NSF [CHE-1301157]
- Banco Santander [CMMI-1036460]
- Multimodal Australian ScienceS Imaging and Visualisation Environment (MASSIVE)
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1301157] Funding Source: National Science Foundation
The stability of the surface of in situ cleaved black phosphorus crystals upon exposure to atmosphere is investigated with synchrotron-based photoelectron spectroscopy. After 2 days atmosphere exposure a stable subnanometer layer of primarily P2O5 forms at the surface. The work function increases by 0.1 eV from 3.9 eV for as-cleaved black phosphorus to 4.0 eV after formation of the 0.4 nm thick oxide, with phosphorus core levels shifting by <0.1 eV. The results indicate minimal charge transfer, suggesting that the oxide layer is suitable for passivation or as an interface layer for further dielectric deposition.
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