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厦门大学 物理学系、化学系, 厦门大学 固体表面物理化学国家重点实验室, 福建, 厦门, 361005
纸质出版日期:2000-5-30,
收稿日期:1999-8-17,
修回日期:1999-12-1,
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林秀华, 徐富春, 江炳熙. 用CH<sub>3</sub>CSNH<sub>2</sub>钝化GaP表面特性的研究[J]. 发光学报, 2000,21(2): 115-119
LIN Xiu-hua, XU Fu-chun, JIANG Bing-xi. Properties of GaP Surface Passivated with CH<sub>3</sub>CSNH<sub>2</sub> Solution[J]. Chinese Journal of Luminescence, 2000,21(2): 115-119
借助扫描电子显微镜(SEM)、X光电子能谱仪(XPS)研究在不同处理条件下
GaP晶片表面硫化物钝化对其结构、形态以及表面形貌的影响。实验结果表明:经过CH3CSNH2溶液一定时间钝化处理后
GaP表面氧化物基本消失
形成薄的硫化物钝化层和较强的Ga—S、P—S键
并引起X光电子能谱的Ga、P芯能级化学位移
Ga的硫化物有较好的稳定性。
The GaP surfaces were passivated withCH
3
CSNH
2
solution of certain concentration at 90℃ temperature.The effect of passivation for different treatment time on the surface structure
morphology and electronic features was investigated using scanning electron microscopy(SEM)and X-ray photoelectron spectroscopy(XPS).First
the treatment time of about 20min.was determined to obtain a uniform passivation film on the GaP surface.This means that the wet chemical reactions were completed in a certain interval of time when the GaP wafer was dipped in the CH
3
CSNH
2
solution.It is found that the oxide overlayer on the GaP surface has been removed basically.The chemical reaction between the Ga atoms and the S
2-
ions dissociated from theCH
3
CSNH
2
solution has taken place under the condition of certain temperature.The XPS measuremnet results indicate that the gallium sulfide and phosphor us sulfide have been formed on the surface during the passivation.After passivation the XPS peaks of Ga 3d and P2p are shifted to higher binding energy by about 0.1-0.5eV.0.2~0.4eV from those of the bulk GaP and their full widths at half maximum(FWHMs)are increased
respectively.The P 2p band has been resolved into two component bands by a curve fitting technique.The fitted band peaked at 129.2eV corresponds to free atom state of P
whereas the other fitted band peaked at 128.5eV corresponds to compound state of P.These chemical shift are consistent with electronegativity and binding energy of sulfur.The passivated surfaces were further sputtered by Ar
+
ion for 2min under the condition of voltage SKV
current density 100uA/cm
2
.It shows that the Ga 3d
P2p
S2p peaks are located at the binding energies of 18.5eV
129.0eV
158.1eV
respectively.Hence it reveals that a thin Soverlayer film has been formed on the GaP surface
which can prevent the oxidation from environment.It possesses a good chemical stability.The XPS measurements identify the presence of both Ga-S and P-S bonding.
硫代乙酰胺钝化GaP表面性质
CH3CSNH2 solutionchemical passivationGaPsurface properties
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