Absence of fermi-level pinning at cleaved nonpolar InN surfaces

Chung Lin Wu, Hong Mao Lee, Cheng Tai Kuo, Chia Hao Chen, Shangjr Gwo

研究成果: Article同行評審

91 引文 斯高帕斯(Scopus)

摘要

Prior experimental work had found that the Fermi level at InN growth surfaces is pinned well above the conduction band edge, leading to strong surface band bending and electron accumulation. Using cross-sectional scanning photoelectron microscopy and spectroscopy, we show definitive evidence of unpinned Fermi level for in situ cleaved a-plane InN surfaces. To confirm the presence or absence of band bending, the surface Fermi level relative to the valence band edge was precisely measured by using both the Fermi edge of Au reference sample and the core level of ultrathin Au overlayer. It is confirmed that flat surface bands only occur at cleaved nonpolar surfaces, consistent with the recent theoretical predictions.

原文English
文章編號106803
期刊Physical review letters
101
發行號10
DOIs
出版狀態Published - 2008 九月 4

All Science Journal Classification (ASJC) codes

  • 物理與天文學 (全部)

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