Axial diagnosis of radio-frequency capacitively coupled Ar/O<sub>2</sub> plasma

Cao Li-Yang; Ma Xiao-Ping; Deng Li-Li; Lu Man-Ting; Xin Yu

doi:10.7498/aps.70.20202113

Abstract

The capacitively coupled Ar plasma containing oxygen, driven by a radio frequency of 27.12 MHz, is investigated by laser-induced photo-detachment technique assisted with a Langmuir probe. The plasmas with different amounts of oxygen are obtained by changing the flow of Ar and oxygen, each of which is controlled by a mass flow controller. The axial distribution of plasma characteristic can be measured by changing the relative axial position of the Langmuir probe between the parallel electrodes. The electron density and electron temperature are calculated from the current-voltage curve measured by the scanning Langmuir probe, and the electronegativity is obtained from the current curves of the probe with the laser-induced photo-detachment technique. The negative ion density can be calculated from the electron density and the electronegativity. It is shown that with oxygen flow rate increasing, the dissociative attachment of oxygen molecules with electrons will consume the electrons with the middle energy in the electron energy probability function (EEPF) measured by Langmuir probe. The EEPF evolves from Druyvesteyn to Maxwellian distribution due to the thermalization by the e-e interaction with applied power increasing. It is worth mentioning that a depression in the EEPF curve will appear when discharging high-pressure Ar gas containing oxygen. This depression can also be caused by the dissociative attachment of oxygen molecules with electrons where the threshold energy is around 4.5 eV. The axial profile of the electron density is calculated from the EEPF changing from a linear rise in pure Ar plasma to a flater phase of the distribution due to the negative ions such as oxygen introduced into the plasma. The electron temperature changes a little at different axial positions. The rise of negative ion density nearby the sheath of powered electrode is due to the dissociative attachment caused by the collision of oxygen molecules with energetic electrons. In addition, the axial distribution of electronegativity takes on a shape of spoon, which results from the consequence of generation and loss of negative ions in the process of the ambipolar-electric-field-driven diffusion to the plasma center.

Keywords:

Authors and contacts

Provincial Key Laboratory of Thin Films, School of Physical Science and Technology, Soochow University, Suzhou 215006, China

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

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 11675117, 11175127) and the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions, China

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References

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Cited By

图 1 安装有Nd:YAG激光器和朗缪尔探针的电容耦合等离子体实验装置

Figure 1. The capacitively coupled plasma experimental device equipped with a Nd:YAG laser and a Langmuir probe.

DownLoad: Full-Size Img PowerPoint

图 2 朗缪尔探针结构示意图

Figure 2. The schematic diagram of the structure of Langmuir probe.

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图 3 等离子体中心位置处探针测得的典型电流曲线

Figure 3. The typical current curves measured by Langmuir probe at z = 0 in the plasma.

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图 4 不同气压和功率条件下极板中心处EEPF随含氧量的变化情况　(a) 2 Pa-50 W; (b) 6 Pa-50 W; (c) 12 Pa-50 W; (d) 2 Pa-150 W; (e) 6 Pa-150 W; (f) 12 Pa-150 W

Figure 4. The dependence of EEPF on the content of O₂ for various discharge pressures and powers at z = 0 mm: (a) 2 Pa-50 W;(b) 6 Pa-50 W; (c) 12 Pa-50 W; (d) 2 Pa-150 W; (e) 6 Pa-150 W; (f) 12 Pa-150 W.

DownLoad: Full-Size Img PowerPoint

图 5 不同气压和功率条件下电子密度随含氧量的轴向分布情况　(a) 2 Pa-50 W; (b) 6 Pa-50 W; (c) 12 Pa-50 W; (d) 2 Pa-150 W; (e) 6 Pa-150 W; (f) 12 Pa-150 W

Figure 5. The axial distribution of electron density on the content of O₂ for various discharge pressures and powers: (a) 2 Pa-50 W; (b) 6 Pa-50 W; (c) 12 Pa-50 W; (d) 2 Pa-150 W; (e) 6 Pa-150 W; (f) 12 Pa-150 W.

DownLoad: Full-Size Img PowerPoint

图 6 不同气压和功率条件下电子温度随含氧量的轴向分布情况　(a) 2 Pa-50 W; (b) 6 Pa-50 W; (c) 12 Pa-50 W; (d) 2 Pa-150 W; (e) 6 Pa-15 0 W; (f) 12 Pa-150 W

Figure 6. The axial distribution of electron temperature on the content of O₂ for various discharge pressures and powers: (a) 2 Pa-50 W; (b) 6 Pa-50 W; (c) 12 Pa-50 W; (d) 2 Pa-150 W; (e) 6 Pa-150 W; (f) 12 Pa-150 W.

DownLoad: Full-Size Img PowerPoint

图 7 不同气压和功率条件下电负度随含氧量的轴向分布情况　(a) 2 Pa-50 W; (b) 6 Pa-50 W; (c) 12 Pa-50 W; (d) 2 Pa-150 W; (e) 6 Pa-150 W; (f) 12 Pa-150 W

Figure 7. The axial distribution of the electronegativity on the content of O₂ for various discharge pressures and powers: (a) 2 Pa-50 W; (b) 6 Pa-50 W; (c) 12 Pa-50 W; (d) 2 Pa-150 W; (e) 6 Pa-150 W; (f) 12 Pa-150 W.

DownLoad: Full-Size Img PowerPoint

图 8 不同气压和功率条件下负离子密度随含氧量的轴向分布情况　(a) 2 Pa-50 W; (b) 6 Pa-50 W; (c) 12 Pa-50 W; (d) 2 Pa-150 W; (e) 6 Pa-150 W; (f) 12 Pa-150 W

Figure 8. The axial distribution of negative ion density on the content of O₂ for various discharge pressures and powers: (a) 2 Pa-50 W; (b) 6 Pa-50 W; (c) 12 Pa-50 W; (d) 2 Pa-150 W; (e) 6 Pa-150 W; (f) 12 Pa-150 W.

DownLoad: Full-Size Img PowerPoint

[1]	Lieberman M A, Lichtenberg A J 1994 Principles of Plasma Discharges and Materials Progressing (New York: Wiley) pp1−5
[2]	Levitskii S M 1957 Sov. Phys. Tech. Phys. 2 887
[3]	Godyak V A, Khanneh A S 1986 IEEE Trans. Plasma Sci. 14 112 Google Scholar
[4]	Lieberman M A, Godyak V A 1998 IEEE Trans. Plasma Sci. 26 955 Google Scholar
[5]	Aliev Y M, Kaganovich I D, Schluter H 1997 Phys. Plasmas. 4 2413 Google Scholar
[6]	Kaganovich I D 2002 Phys. Rev. Lett. 89 265006 Google Scholar
[7]	Liu Y X, Zhang Q Z, Jiang W, Hou L J, Jiang X Z, Lu W Q, Wang Y N 2011 Phys. Rev. Lett. 107 055002 Google Scholar
[8]	Liu Y X, Zhang Q Z, Jiang W, Jiang X Z, Lu W Q, Wang Y N 2012 Plasma Sources Sci. Technol. 21 035010 Google Scholar
[9]	Turner M M 1995 Phys. Rev. Lett. 75 1312 Google Scholar
[10]	Schulze J, Donko Z, Lafleur T, Wilczek S, Brinkmann R P 2018 Plasma Sources Sci. Technol. 27 055010 Google Scholar
[11]	Tsendin L D 1989 Sov. Phys. Tech. Phys. 34 11
[12]	Schulze J, Derzsi A, Dittmann K, Hemke T, Meichsner J, Donko Z 2011 Phys. Rev. Lett. 107 275001 Google Scholar
[13]	Schulze J, Donko Z, Derzsi A, Korolov I, Schuengel E 2015 Plasma Sources Sci. Technol. 24 015019 Google Scholar
[14]	Liu Y X, Schüngel E, Korolov I, Donkó Z, Wang Y N, Schulze J 2016 Phys. Rev. Lett. 116 255002 Google Scholar
[15]	Liu Y X, Korolov I, Schüngel E, Wang Y N, Donkó Z, Schulze J 2017 Phys. Plasma. 24 073512 Google Scholar
[16]	Irving S 1968 Proc. Kodak Photoresist Seminar (Rochester, New York: Eastman, Kodak) pp26−9
[17]	Chashmejahanbin M R, Salimi A and Ershad Langroudi A 2014 Int. J. Adhes. Adhes. 49 44 Google Scholar
[18]	Vesel A, Mozetic M 2017 J. Phys. D: Appl. Phys. 50 293001 Google Scholar
[19]	Kawai Y, Konishi N, Watanabe J, Ohmi T 1994 Appl. Phys. Lett. 64 2223 Google Scholar
[20]	Hess D W 1999 IBM J. Res. Dev. 43 127 Google Scholar
[21]	Gudmundsson J T, Ventéjou B 2015 J. Appl. Phys. 118 153302 Google Scholar
[22]	Gudmundsson J T, Proto A 2019 Plasma Sources Sci. Technol. 28 045012 Google Scholar
[23]	Gudmundsson J T, Snorrason D I 2017 J. Appl. Phys. 122 193302 Google Scholar
[24]	Gudmundsson J T, Snorrason D Hannesdottir H 2018 Plasma Sources Sci. Technol. 27 025009 Google Scholar
[25]	Gudmundsson J T, Lieberman M A 2015 Plasma Sources Sci. Technol. 24 035016 Google Scholar
[26]	Wegner T, Kullig C, Meichsner J 2015 Contrib. Plasma Phys. 55 728736 Google Scholar
[27]	Liu Y X, Zhang Q Z, Liu J, Song Y H, Bogaerts A, Wang Y N 2012 Appl. Phys. Lett. 101 114101 Google Scholar
[28]	You K H, Schulze J, Derzsi A, Donk Z, Yeom H J, Kim J H, Seong D J, Lee H C 2019 Phys. Plasmas 26 013503 Google Scholar
[29]	Kechkar S, Swift P, Kelly S, Kumar S, Daniels S Turner M 2017 Plasma Sources Sci. Technol. 26 065009 Google Scholar
[30]	Bacal M, Hamilton G W 1979 Phys. Rev. Lett. 42 1538 Google Scholar
[31]	Devynck P, Auvray J, Bacal M, Berlemont P, Brunetear J, Leroy R, Stern R A 1989 Rev. Sci. Instrum. 60 2873 Google Scholar
[32]	Balgiiti-Sube F E, Baksht F G, Bacal M 1996 Rev. Sci. Instrum. 67 2221 Google Scholar
[33]	Nikitin A G, Balghiti F Ei, Bacal M 1996 Plasma Sources Sci. Technol. 5 37 Google Scholar
[34]	Hamabe M, Oka Y, Tsumori O, Kuroda T, Bacal M 1998 Rev. Sci. Instrum. 69 1298 Google Scholar
[35]	Nishiura M, Sasao M, Matsumoto Y, Hamabe M, Wada M, Yamaoka H, Bacal M 2002 Rev. Sci. Instrum. 73 973 Google Scholar
[36]	Bryant P M, Bradley J W 2013 Plasma Sources Sci. Technol. 22 015014 Google Scholar
[37]	You S D, Dodd R, Edwards A, Bradley J W 2010 J. Phys. D: Appl. Phys. 43 505205 Google Scholar
[38]	Dodd R, You S D, Bryant P M, Bradley J W 2010 Plasma Sources Sci. Technol. 19 015021 Google Scholar
[39]	Scribbins S, Bowes M, Bradley J W 2013 J. Phys. D: Appl. Phys. 46 045203 Google Scholar
[40]	Bowes M, Bradley J W 2014 J. Phys. D: Appl. Phys. 47 265202 Google Scholar
[41]	Oudini N, Sirse N, Taccogna F, Ellingboe A R, Bendib A 2016 Appl. Phys. Lett. 109 124101 Google Scholar
[42]	Oudini N, Sirse N, Benallal R, Taccogna F, Anesland A, Bendib A, Ellingboe A R 2015 Phys. Plasmas 22 073509 Google Scholar
[43]	Oudini N, Taccogna F, Bendib A, Anesland A 2014 Phys. Plasmas 21 063515 Google Scholar
[44]	Conway J, Sirse N, Karkari S K, Turner M M 2010 Plasma Sources Sci. Technol. 19 065002 Google Scholar
[45]	Sirse N, Karkari S K, Mujawar M A, Conway J, Turner M M 2011 Plasma Sources Sci. Technol. 20 055003 Google Scholar
[46]	Sirse N, Oudini O, Bendib A, Ellingboe A R 2016 Plasma Sources Sci. Technol. 25 04LT01 Google Scholar
[47]	Kullig C, Dittmann K, Meichsner J 2010 Plasma Sources Sci. Technol. 19 065011 Google Scholar
[48]	Kullig C, Dittmann K, Meichsner J 2012 Phys. Plasmas 19 073517 Google Scholar
[49]	Dittmann K, Kullig C, Meichsner J 2012 Plasma Phys. Controlled Fusion 54 124038 Google Scholar
[50]	Kullig C, Dittmann K, Wegner T, Sheykin I, Matyash K, Loffhagen D, Schnerder R, Meichsner J 2012 Contrib. Plasma Phys. 52 836 Google Scholar
[51]	Kullig C, Wegner Th, Meichsner J 2015 Phys. Plasmas 22 043515 Google Scholar
[52]	Zhao Y F, Zhou Y, Ma X P, Cao L Y, Zheng F G, Xin Y 2019 Phys. Plasmas 26 033502 Google Scholar
[53]	杨郁, 唐成双, 赵一帆, 虞一青, 辛煜 2017 物理学报 66 185202 Google Scholar Yang Y, Tang C S, Zhao Y F, Y Y Q, Xin Y 2017 Acta Phys. Sin. 66 185202 Google Scholar
[54]	Gudmundsson J T, Kouznetsov I G, Patel K K, Lieberman M A 2001 J. Phys. D: Appl. Phys. 34 1100 Google Scholar
[55]	Gudmundsson J T, Thorsteinsson E G 2007 Plasma Sources Sci. Technol. 16 399 Google Scholar
[56]	Godyak A, Piejak R B 1990 Phys. Rev. Lett. 65 996 Google Scholar
[57]	Trunec D, Spanel P, Smith D 2003 Chem. Phys. Lett. 372 728 Google Scholar
[58]	Itikawa Y 2009 J. Phys. Chem. Ref. Data. 38 1 Google Scholar
[59]	迈克尔·A·力伯曼, 阿伦·J·里登伯格 (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554页 Lieberman M A, Lichtenberg A J (translated by Pu Y K) 2007 Principles of Plasma Discharges and Processing (Beijing: Science Press) p554 (in Chinese)
[60]	王涛, 王俊, 唐成双, 杨郁, 辛煜 2017 核聚变与等离子体物理 37 1 Google Scholar Wang T, Wang J, Tang C S, Yang Y, Xin Y 2017 Nucl. Fusion Plasma Phys. 37 1 Google Scholar
[61]	Lee S H, Iza F, Lee J K 2006 Phys. Plasmas 13 057102 Google Scholar

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Axial diagnosis of radio-frequency capacitively coupled Ar/O₂ plasma

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Axial diagnosis of radio-frequency capacitively coupled Ar/O2 plasma

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Axial diagnosis of radio-frequency capacitively coupled Ar/O₂ plasma