脉冲射频容性耦合氩等离子体的发射探针诊断

周瑜; 操礼阳; 马晓萍; 邓丽丽; 辛煜

doi:10.7498/aps.69.20191864

摘要

利用工作在浮点模式下的发射探针, 对500 Hz脉冲调制的27.12 MHz容性耦合氩气等离子体的空间电位和电子温度的时变特性进行了诊断. 等离子体空间电位是通过测量强热状态下的发射探针电位获得的, 而电子温度则是由发射探针在冷、热状态下的电位差来估算得到. 测量结果表明: 脉冲开启时, 空间电位会快速上升并在300 μs内趋于饱和; 当脉冲关断后, 空间电位经历了快速下降后趋于稳定的过程. 电子温度在脉冲开启时存在过冲并趋于稳定的特征; 而在脉冲关断期间, 电子温度在300 μs内则快速下降到0.45 eV后略有上升. 无论在脉冲开启或关断期间, 空间电位基本上都随功率和气压的变化存在有线性的依赖关系; 而放电功率对脉冲开启期间过冲电子温度与稳态电子温度差异的影响较大. 针对空间电位和电子温度在各阶段及不同放电条件下的时变特性, 给出了相应的解释.

关键词:

Abstract

There are several methods of diagnosing the capacitively coupled plasma, such as microwave resonance probe, Langmuir probe, etc, but methods like microwave resonance probe are mainly used for determining the electron density. Moreover, in the diagnosing of plasma potential, the emissive probe has a higher accuracy than the traditional electrostatic probes, and it can directly monitor the potential in real time. However, in the existing work, emissive probe is mostly applied to the diagnosis of plasmas with high density or plasmas modulated by pulsed dual frequency (one of the radio frequency sources is modulated), the experiments on the emissive probe diagonising plasma excited by a pulsed single frequency are quite rare. In this paper, the temporal evolution of the plasma potential and electron temperature with input power and pressure in a pulsed 27.12 MHz capacitively coupled argon plasma are investigated by using an emissive probe operated in floating point mode. The plasma potential is obtained by measuring emissive probe potential under a strongly heated condition, while the electron temperature is estimated from the potential difference between the emissive probe under strongly heating and cold conditions. The measurements show that as the pulse is on, the plasma potential will rise rapidly and become saturated within 300 μs due to the requirement for neutrality condition; while the pulse is off, the plasma potential undergoes a rapid decline and then stabilizes. An overshoot for the electron temperature occurs as the onset of the pulse, because of the influence of radio frequency electric field and residual electrons from the last pulse; during the pulse-off time, rapid loss of high-energy electrons causes the electron temperature to rapidly drops to 0.45 eV within 300 μs, then it rises slightly, which is related to the electrons emitted by the probe. The plasma potential basically has a linear dependence on the change of input power and pressure for the pulse-on and pulse-off time; and the input power has a greater influence on the difference between the overshoot electron temperature and the steady state electron temperature during the pulse-on time. Corresponding explanations are given for the temporal evolution of plasma potential and electron temperature in different pulse stages and under different discharge conditions.

Keywords:

作者及机构信息

苏州大学物理科学与技术学院, 苏州　215006

通信作者: 辛煜, yuxin@suda.edu.cn

基金项目: 国家级-国家自然科学基金(11675117，11175127)

Authors and contacts

Department of Physical Science and Technology, Soochow University, Suzhou 215006, China

Corresponding author: Xin Yu, yuxin@suda.edu.cn

文章全文 : translate this paragraph

参考文献

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施引文献

图 1 装置着发射探针系统的脉冲容性耦合等离子体装置示意图

Fig. 1. Schematic diagram of the pulsed capacitively coupled plasma apparatus equipped with an emissive probe system.

下载: 全尺寸图片幻灯片

图 2 连续波激发的容性耦合等离子体中测得的探针悬浮电位(V_f)与加热电流(I_ht)的关系图, 测量在气压为3.0 Pa、射频功率为50 W的氩气等离子体中进行

Fig. 2. A plot of measured floating potential (V_f) versus heating current (I_ht) in a CCP discharge in a continuous wave mode. The measurements were carried out at argon plasma with pressure of 3.0 Pa and input power of 50 W.

下载: 全尺寸图片幻灯片

图 3 放电气压为3.0 Pa、脉冲射频功率为30 W氩气等离子体中, 发射探针测量得到的数据, 调制频率为500 Hz, 占空比50%　(a)悬浮电位及空间电位的时变特性; (b) 电子温度的时变特性

Fig. 3. The data measured by an emissive probe in an argon plasma with a discharge pressure of 3.0 Pa and a pulsed RF power of 30 W: (a) Temporal evolution of floating potential and plasma potential; (b) temporal evolution of electron temperature. The discharge was pulsed at 500 Hz with 50% duty cycle.

下载: 全尺寸图片幻灯片

图 4 不同放电条件下V_p和T_e的时变特性(测量在频率为500 Hz, 占空比50%调制的氩气等离子体中进行)　(a), (c) 在3 Pa不同功率条件下V_p和T_e的时变特性; (b), (d) 在50 W不同气压条件下V_p和T_e的时变特性

Fig. 4. A plot of temporal evolution of plasma potential and electron temperature: (a) plasma potential (V_p) with power (3 Pa); (b) plasma potential (V_p) with pressure (50 W); (c) electron temperature (T_e) with power (3 Pa); (d) electron temperature (T_e) with pressure (50 W). The measurements are carried out at argon plasma and the discharge is pulsed at 500 Hz with 50% duty cycle.

下载: 全尺寸图片幻灯片

图 5 不同放电条件下各阶段对应的空间电位及电子温度, 4幅图分别对应图4中的(a), (b), (c), (d)

Fig. 5. The plasma potential and electron temperature in each stage under different discharge conditions. The four figures correspond to (a), (b), (c), and (d) in Fig. 4, respectively.

下载: 全尺寸图片幻灯片

[1]	迈克尔·A·力伯曼, 阿伦·J·里登伯格著 (蒲以康译) 2007 等离子体放电原理与材料处理 (北京: 科学出版社) 第1−5页 Lieberman M A, Lichtenberg A J (translated by Pu Y K) 2007 Principles of Plasma Discharges and Processing (Beijing: Science Press) pp1−5 (in Chinese)
[2]	Chang C Y, Sze S M 1996 McGraw-Hill Dictionary of Scientific and Technical Terms (New York: ULSI Technology) p329
[3]	Hopwood J 1992 Plasma Sources Sci. Technol. 1 109 Google Scholar
[4]	Kahoh M, Suzuki K, Tonotani J, Aoki K, Yamage M 2001 Jpn. J. Appl. Phys. 40 5419 Google Scholar
[5]	Lieberman M A, Booth J P, Chabert P, Rax J M, TurnerM M 2002 Plasma Sources Sci. Technol. 11 283 Google Scholar
[6]	Hebner G A, Barnat E V, Miller P A, Paterson A M, Holland J P 2006 Plasma Sources Sci. Technol. 15 879 Google Scholar
[7]	Chabert P 2007 J. Phys. D: Appl. Phys. 40 R63 Google Scholar
[8]	Lee I, Graves D B, Lieberman M A 2008 Plasma Sources Sci. Technol. 17 015018 Google Scholar
[9]	Goto H H, Lowe H D, Ohmi T 1992 J. Vac. Sci. Technol., A 10 3048 Google Scholar
[10]	Mishra A, Kim K N, Kim T H, Yeom G Y 2012 Plasma Source Sci. Technol. 21 035018 Google Scholar
[11]	Samukawa S, Furuoya S 1993 Appl. Phys. Lett. 63 2044 Google Scholar
[12]	Samukawa S, Mieno T 1996 Plasma Sources Sci. Technol. 5 132 Google Scholar
[13]	Verdeyen J T, Beberman J, Overzet L 1990 J. Vac. Sci. Technol. A 8 1851 Google Scholar
[14]	Howling A A, Sansonnens L, Dorier J L, Hollenstein C 1994 J. Appl. Phys. 75 1340 Google Scholar
[15]	Wu H P, Tian Q W, Tian X B, Gong C Z, Zhang X Y, Wu Z Z 2019 Surf. Coat. Technol. 374 383 Google Scholar
[16]	Sun X Y, Zhang Y R, Chai S, Wang Y N, He J X 2019 Phys. Plasmas 26 043503 Google Scholar
[17]	Imamura T, Yamamoto K, Kurihara K, Hayashi H 2017 J. Vac. Sci. Technol., B 35 062201 Google Scholar
[18]	Rahman M T, Hossain M M 2017 Phys. Plasmas 24 013516 Google Scholar
[19]	Jeon M H, Park J W, Kim T H, Yun D H, Kim K N, Yeom G Y 2016 J. NanoSci. Nanotechnol. 16 11831 Google Scholar
[20]	Liu R Q, Liu Y, Jia W Z, Zhou Y W 2017 Phys. Plasmas 24 013517 Google Scholar
[21]	Thorsteinsson E G, Gudmundsson J T 2009 Plasma Sources Sci. Technol. 18 045002 Google Scholar
[22]	Maresca A, Orlov K, Kortshagen U 2002 Phys. Rev. E 65 056405 Google Scholar
[23]	Liu F X, Tsankov T V, Pu Y K 2015 J. Phys. D: Appl. Phys. 48 035206 Google Scholar
[24]	Xue C, Wen D Q, Liu W, Zhang Y R, Gao F, Wang Y N 2017 J. Vac. Sci. Technol. A 35 021301 Google Scholar
[25]	Wang E Y, Intrator T, Hershkowitz N 1985 Rev. Sci. Instrum. 56 519 Google Scholar
[26]	Fujita H, Yagura S 1983 Jpn. J. Appl. Phys. 22 148
[27]	Li J Q, Xu J, Bai Y J, Lu W Q, Wang Y N 2016 J. Vac. Sci. Technol. A 34 061304 Google Scholar
[28]	Sheehan J P, Hershkowitz N 2011 Plasma Sources Sci. Technol. 20 063001 Google Scholar
[29]	Langmuir I 1923 J. Franklin Inst. 196 751 Google Scholar
[30]	Chen F F 1965 Electric Probes Plasma Diagnostic Techniques (New York: Academic) p184
[31]	Sheehan J P, Barnat E V, Weatherford B R, Kaganovich D, Hershkowitz N 2014 Phys. Plasmas 21 013510 Google Scholar
[32]	Mishra A, Seo J S, Kim K N, Yeom G Y 2013 J. Phys. D: Appl. Phys. 46 235203 Google Scholar
[33]	Mishra A, Yeom G Y 2016 AIP Adv. 6 095101 Google Scholar
[34]	Mishra A, Jeon M H, Kim K N, Yeom G Y 2012 Plasma Sources Sci. Technol. 21 055006 Google Scholar
[35]	Mishra A, Kelly P J, Bradley J W 2011 J. Phys. D: Appl. Phys. 44 425201 Google Scholar
[36]	Liebig B, Bradley J W 2013 Plasma Sources Sci. Technol. 22 045020 Google Scholar
[37]	Piejak R B, Godyak V A, Garner R, Alexandrovich B M, Sternberg N 2004 J. Appl. Phys. 95 3785 Google Scholar
[38]	Karkari S K, Ellingboe A R, Gaman C 2008 Appl. Phys. Lett. 93 071501 Google Scholar
[39]	Chen F F, Chang J P 2002 Principles of Plasma Processing (Dordrecht/New York: Kluwer/Plenum) pp31–32
[40]	Zhao Y F, Zhou Y, Ma X P, Cao L Y, Zheng F G, Xin Y 2019 Phys. Plasmas 26 033502 Google Scholar
[41]	Karkari S K, Gaman C, Ellingboe A R, Swindells I, Bradley J W 2007 Meas. Sci. Technol. 18 2649 Google Scholar
[42]	Welzel T, Dunger T, Leibig B, Richter F 2008 New J. Phys. 10 123008 Google Scholar
[43]	Bradley J W, Karkari S K, Vetushka A 2004 Plasma Sources Sci. Technol. 13 189 Google Scholar
[44]	Arslanbekov R R, Kudryavtsev A A 2001 Phys. Rev. E 64 016401 Google Scholar
[45]	Liu F X, Guo X M, Pu Y K 2015 Plasma Sources Sci. Technol. 24 034013 Google Scholar
[46]	You S D, Dodd R, Edwards A, Bradley J W 2010 J. Phys. D: Appl. Phys. 43 505205 Google Scholar
[47]	Wenig G, Schulze M, Awakowicz P, Keudell A V 2006 Plasma Sources Sci. Technol. 15 S35 Google Scholar
[48]	Poolcharuansin P, BradleyJ W 2010 Plasma Sources Sci. Technol. 19 025010 Google Scholar

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脉冲射频容性耦合氩等离子体的发射探针诊断