Light-Induced Ambient Degradation of Few-Layer Black Phosphorus: Mechanism and Protection

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• 作者：Dr. Qionghua Zhou ; Dr. Qian Chen ; Yilong Tong and Prof. Jinlan Wang
• 刊名：Angewandte Chemie
• 出版年：2016
• 出版时间：September 12, 2016
• 年：2016
• 卷：128
• 期：38
• 页码：11609-11613
• 全文大小：1922K
• ISSN：1521-3757

文摘

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.