NEGATIVE ELECTRON-AFFINITY EFFECTS ON H-PLASMA EXPOSED DIAMOND(100) SURFACES

被引:36
作者
BAUMANN, PK
NEMANICH, RJ
机构
[1] Department of Physics, North Carolina State University, Raleigh
关键词
DIAMOND; HYDROGEN; SUBSTRATE PREPARATION; SURFACE CHARACTERIZATION;
D O I
10.1016/0925-9635(94)05228-X
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The effects of annealing and a H plasma exposure on natural type IIb diamond (100) were investigated by means of ultraviolet photoemission spectroscopy (UPS). The diamond (100) surface was found to exhibit a negative electron affinity (NEA) following a 900 degrees C anneal in ultrahigh vacuum. After a H plasma exposure the NEA peak in the UPS spectra had doubled in height. An anneal to 1100 degrees C resulted in the removal of the sharp NEA feature. A second H plasma treatment resulted in the reappearance of the NEA peak like after the first H plasma exposure. A 2 x 1 reconstructed low-energy electron diffraction (LEED) pattern was observed subsequent to the anneals as well as the H plasma treatments. The fact that a NEA can be induced or removed repeatedly by means of a H plasma exposure or a 1100 degrees C anneal respectively provides evidence to correlate the appearance of a NEA with the presence of a monohydride terminated surface.
引用
收藏
页码:802 / 805
页数:4
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