Light‐Induced Ambient Degradation of Few‐Layer Black Phosphorus: Mechanism and Protection
Top Cited Papers
- 16 August 2016
- journal article
- research article
- Published by Wiley in Angewandte Chemie-International Edition
- Vol. 55 (38), 11437-11441
- https://doi.org/10.1002/anie.201605168
Abstract
The environmental instability of single- or few-layer black phosphorus (BP) has become a major hurdle for BP-based devices. The degradation mechanism remains unclear and finding ways to protect BP from degradation is still highly challenging. Based on ab initio electronic structure calculations and molecular dynamics simulations, a three-step picture on the ambient degradation of BP is provided: generation of superoxide under light, dissociation of the superoxide, and eventual breakdown under the action of water. The well-matched band gap and band-edge positions for the redox potential accelerates the degradation of thinner BP. Furthermore, it was found that the formation of P-O-P bonds can greatly stabilize the BP framework. A possible protection strategy using a fully oxidized BP layer as the native capping is thus proposed. Such a fully oxidization layer can resist corrosion from water and leave the BP underneath intact with simultaneous high hole mobility.Keywords
Funding Information
- NSFC (21525311, 21373045, 11404056)
- NSF of Jiangsu (BK20130016)
- SRFDP (20130092110029, 20130092120042)
- Central Universities of China
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