首页> 外文OA文献 >Effects of fast atoms and energy-dependent secondary electron emission yields in PIC/ MCC simulations of capacitively coupled plasmas
【2h】

Effects of fast atoms and energy-dependent secondary electron emission yields in PIC/ MCC simulations of capacitively coupled plasmas

机译:电容耦合等离子体的PIC / MCC模拟中快原子和能量相关的二次电子发射量的影响

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

In most PIC/MCC simulations of radio frequency capacitively coupled plasmas (CCPs) several simpli cations are commonly made: (i) fast neutrals are not traced, (ii) heavy particle induced excitation and ionization are neglected, (iii) secondary electron emission from boundary surfaces due to neutral particle impact is not taken into account, and (iv) the secondary electron emission coef cient is assumed to be constant, i.e. independent of the incident particle energy and the surface conditions. Here, we examine the validity of these simpli cations under conditions typical for plasma processing applications. We study the effects of including fast neutrals and using realistic energy-dependent secondary electron emission coef cients for ions and fast neutrals in simulations of CCPs operated in argon at 13.56 MHz and at neutral gas pressures between 5 Pa and 100 Pa. We nd an increase of the plasma density and the ion ux to the electrodes under most conditions when heavy particles are included realistically in the simulation. The sheath widths are found to be smaller and the simulations are found to diverge at high pressures for high voltage amplitudes in qualitative agreement with experimental ndings. By switching individual processes on and off inudthe simulations we identify their individual effects on the ionization dynamics and plasma parameters. While the gas-phase effects of heavy particle processes are found to be moderate at most conditions, the self-consistent calculation of the effective secondary electron yield proves to be important in simulations of CCPs in order to yield realistic results.
机译:在大多数射频电容耦合等离子体(CCP)的PIC / MCC模拟中,通常会进行以下几种简化:(i)没有追踪到快速中性;(ii)忽略了重粒子引起的激发和电离;(iii)二次电子发射不考虑由于中性粒子撞击而产生的界面,并且(iv)假定二次电子发射系数是恒定的,即与入射粒子能量和表面条件无关。在这里,我们在等离子处理应用的典型条件下检查了这些简化的有效性。我们在以13.56 MHz在氩气中和5 Pa至100 Pa的中性气压下运行的CCP的模拟中,研究了包括快速中性以及对离子和快速中性使用现实的依赖于能量的二次电子发射系数的影响。模拟中实际包含重粒子的情况下,大多数情况下等离子体密度和离子对电极的离子通量。发现鞘的宽度较小,并且发现在高压下对于高电压幅度的模拟发散,与实验结果在质量上一致。通过在仿真中打开和关闭各个过程,我们可以确定它们对电离动力学和等离子体参数的影响。虽然发现重粒子过程的气相效应在大多数情况下都中等,但有效的二次电子产率的自洽计算在CCP的模拟中被证明对于产生实际结果很重要。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号