Atomic-Scale Origin of Long-Term Stability and High Performance of p-GaN Nanowire Arrays for Photocatalytic Overall Pure Water Splitting

详细信息    查看全文

• 作者：Md Golam Kibria ; Ruimin Qiao ; Wanli Yang ; Idris Boukahil ; Xianghua Kong ; Faqrul Alam Chowdhury ; Michel L. Trudeau ; Wei Ji ; Hong Guo ; F. J. Himpsel ; Lionel Vayssieres and Zetian Mi
• 刊名：Advanced Materials
• 出版年：2016
• 出版时间：October 12, 2016
• 年：2016
• 卷：28
• 期：38
• 页码：8388-8397
• 全文大小：2256K
• ISSN：1521-4095

文摘

The atomic-scale origin of the unusually high performance and long-term stability of wurtzite p-GaN oriented nanowire arrays is revealed. Nitrogen termination of both the polar (0001¯) top face and the nonpolar (101¯0) side faces of the nanowires is essential for long-term stability and high efficiency. Such a distinct atomic configuration ensures not only stability against (photo) oxidation in air and in water/electrolyte but, as importantly, also provides the necessary overall reverse crystal polarization needed for efficient hole extraction in p-GaN.