SPATIAL VARIATIONS OF RADIO-FREQUENCY PLASMA-DENSITY CAUSED BY A STEP-CHANGE OF SECONDARY-ELECTRON EMISSION COEFFICIENT

被引:5
|
作者
XU, WL
SIDES, PJ
机构
[1] Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh
关键词
D O I
10.1063/1.359452
中图分类号
O59 [应用物理学];
学科分类号
摘要
A two-dimensional analytical model for the effect of a nonuniform secondary electron emission coefficient (γ) on the powered electrode of a radio frequency plasma was developed. The nonuniformity was a step change in the value of γ. The ambipolar diffusion equation, including ionization by thermal and secondary electrons, took the form of a Helmholtz equation for which the solution by separation of variables was a series of cosine functions. The discontinuity of γ on the electrode engendered substantial nonuniformity of plasma density. For example, the nonuniformity at the sheath edge of an Ar plasma (50 mTorr, 200 V) was 40% for a substrate having a γ of 0.027 and resting on a platen having a γ of 1.00. © 1995 American Institute of Physics.
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页码:4293 / 4301
页数:9
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