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In the etching process, a bias source is usually applied to the substrate of the inductively coupled plasma (ICP) to realize independent modulation of the ion energy and ion flux. In this work, a hybrid model, i.e. a global model combined bi-directionally with a fluid sheath model, is employed to investigate the plasma properties and ion energy distribution function (IEDF) in biased inductively coupled Ar/O2/Cl2 plasmas. The results indicate that at a bias frequency of 2.26 MHz, the Cl– ion density and ClO+ ion density first increase with bias voltage rising, and then they decrease, and finally they rise again, which is different from the densities of other charged species, such as O and Cl atoms. At the bias frequency of 13.56 MHz and 27.12 MHz, except Cl– and
$ {\text{Cl}}_2^ + $ ions, the evolutions of other species densities with bias voltage are similar to the results at lower bias frequency. The evolution of the species densities with bias frequency depends on the bias voltage. For instance, in the low bias voltage range (< 200 V), the densities of charges species, O and Cl atoms increase with bias frequency increasing due to a significant increase in the heating of the plasma by the bias source. However, when the bias voltage is high, say, higher than 300 V, except$ {\text{Cl}}_2^ + $ and Cl– ions, the densities of other charged species, O and Cl atoms first decrease with bias frequency increasing and then they increase due to a decrease and then an increase in the heating of the plasma by the bias source. In addition, as the bias frequency increases, the peak separation of IEDF becomes narrow, the high energy peak and low energy peak approach each other and they almost merge into one peak at high bias frequency. The results obtained in this work are of significant importance in improving the etching process.-
Keywords:
- inductively coupled plasma /
- bias source /
- hybrid model /
- ion energy /
- ion flux
[1] Efremov A M, Kim D P, Kim C I 2004 IEEE Trans. Plasma Sci. 32 1344Google Scholar
[2] Efremov A M, Kim D P, Kim C I 2003 J. Vac. Sci. Technol., A 21 1568Google Scholar
[3] Bogaerts A, Neyts E, Gijbels R, Van Der Mullen J 2002 Spectrochim Acta, Part B 57 609Google Scholar
[4] Choi S K, Kim D P, Kim C I, Chang E G 2001 J. Vac. Sci. Technol., A 19 1063Google Scholar
[5] Lee Y J, Han H R, Lee J, Yeom G Y 2000 Surf. Coat. Technol. 131 257Google Scholar
[6] Wen D Q, Liu W, Gao F, Lieberman M A, Wang Y N 2016 Plasma Sources Sci. Technol. 25 045009Google Scholar
[7] Wen D, Zhang Y, Lieberman M A, Wang Y 2017 Plasma Processes Polym. 14 1600100Google Scholar
[8] Zhang Y R, Gao F, Li X C, Bogaerts A, Wang Y N 2015 J. Vac. Sci. Technol., A 33 061303Google Scholar
[9] Lee H C, Lee M H, Chung C W 2010 Appl. Phys. Lett. 96 071501Google Scholar
[10] Lee H C, Chung C W 2012 Appl. Phys. Lett. 101 244104Google Scholar
[11] Lee H C, Bang J Y, Chung C W 2011 Thin Solid Films 519 7009Google Scholar
[12] Lee C, Lieberman M A 1995 J. Vac. Sci. Technol., A 13 368Google Scholar
[13] Gudmundsson J T 2004 J. Phys. D: Appl. Phys. 37 2073Google Scholar
[14] Jung J, Kim M S, Park J, Lim C M, Hwang T W, Seo B J, Chung C W 2023 Phys. Plasmas 30 023504Google Scholar
[15] Tong L, Zhang Y R, Huang J W, Zhao M L, Wen D Q, Song Y H, Wang Y N 2021 Phys. Plasmas 28 053512Google Scholar
[16] Tong L, Zhao M L, Zhang Y R, Song Y H, Wang Y N 2023 J. Phys. D: Appl. Phys. 56 365202
[17] Khater M H, Overzet L J 2004 Plasma Sources Sci. Technol. 13 466Google Scholar
[18] Dai Z L, Zhang S Q, Wang Y N 2013 Vacuum 89 197Google Scholar
[19] Zhang S Q, Dai Z L, Song Y H, Wang Y N 2014 Vacuum 99 180Google Scholar
[20] Levko D, Raja L L 2022 J. Vac. Sci. Technol., B 40 052205Google Scholar
[21] Levko D, Upadhyay R R, Suzuki K, Raja L L 2023 J. Vac. Sci. Technol., A 41 012205Google Scholar
[22] Malyshev M V, Donnelly V M, Colonell J I, Samukawa S 1999 J. Appl. Phys. 86 4813Google Scholar
[23] Malyshev M V, Donnelly V M 2000 Plasma Sources Sci. Technol. 9 353Google Scholar
[24] Donnelly V M, Malyshev M V 2000 Appl. Phys. Lett. 77 2467Google Scholar
[25] Malyshev M V, Donnelly V M 2001 J. Appl. Phys. 90 1130Google Scholar
[26] Malyshev M V, Fuller N C M, Bogart K H A, Donnelly V M, Herman I P 2000 J. Appl. Phys. 88 2246Google Scholar
[27] Malyshev M V, Donnelly V M 2000 J. Appl. Phys. 88 6207Google Scholar
[28] Malyshev M V, Donnelly V M 2000 J. Appl. Phys. 87 1642Google Scholar
[29] Thorsteinsson E G, Gudmundsson J T 2010 Plasma Sources Sci. Technol. 19 015001Google Scholar
[30] Thorsteinsson E G, Gudmundsson J T 2010 J. Phys. D: Appl. Phys. 43 115201Google Scholar
[31] Thorsteinsson E G, Gudmundsson J T 2010 J. Phys. D: Appl. Phys. 43 115202Google Scholar
[32] Thorsteinsson E G, Gudmundsson J T 2010 Plasma Sources Sci. Technol. 19 055008Google Scholar
[33] Gudmundsson J T, Hjartarson A T, Thorsteinsson E G 2012 Vacuum 86 808Google Scholar
[34] Zhang Y R, Zhao Z Z, Xue C, Gao F, Wang Y N 2019 J. Phys. D: Appl. Phys. 52 295204
[35] Liu W, Wen D Q, Zhao S X, Gao F, Wang Y N 2015 Plasma Sources Sci. Technol. 24 025035Google Scholar
[36] 范惠泽, 刘凯, 黄永清, 蔡世伟, 任晓敏, 段晓峰, 王琦, 刘昊, 吴瑶, 费嘉瑞 2017 真空科学与技术学报 37 286Google Scholar
Fan H Z, Liu K, Huang Y Q, Cai S W, Ren X M, Duan X F, Wang Q, Liu H, Wu Y, Fei J R 2017 Chin. J. Vac. Sci. Technol. 37 286Google Scholar
[37] Smith S A, Lampert W V, Rajagopal P, Banks A D, Thomson D, Davis R F 2000 J. Vac. Sci. Technol., A 18 879Google Scholar
[38] Lee J M, Chang K M, Lee I H, Park S J 2000 J. Vac. Sci. Technol., B 18 1409Google Scholar
[39] Taube A, Kamiński M, Ekielski M, et al. 2021 Mater. Sci. Semicond. Process. 122 105450Google Scholar
[40] Chung C W, Chung I 2000 J. Vac. Sci. Technol., A 18 835Google Scholar
[41] Park J S, Kim T H, Choi C S, Hahn Y B 2002 Korean J. Chem. Eng. 19 486Google Scholar
[42] Kwon K H, Efremov A, Yun S J, Chun I, Kim K 2014 Thin Solid Films 552 105Google Scholar
[43] Kang S, Efremov A, Yun S J, Son J, Kwon K H 2013 Plasma Chem. Plasma Process. 33 527Google Scholar
[44] Tinck S, Boullart W, Bogaerts A 2009 J. Phys. D: Appl. Phys. 42 095204Google Scholar
[45] Tinck S, Boullart W, Bogaerts A 2011 Plasma Sources Sci. Technol. 20 045012Google Scholar
[46] Tinck S, Bogaerts A, Shamiryan D 2011 Plasma Processes Polym. 8 490Google Scholar
[47] Hsu C C, Coburn J W, Graves D B 2006 J. Vac. Sci. Technol., A 24 1Google Scholar
[48] Efremov A, Amirov I, Izyumov M 2023 Vacuum 207 111664Google Scholar
[49] Hsu C C, Nierode M A, Coburn J W, Graves D B 2006 J. Phys. D: Appl. Phys. 39 3272Google Scholar
[50] Schulze J, Schüngel E, Czarnetzki U 2012 Appl. Phys. Lett. 100 024102Google Scholar
[51] Ahr P, Schüngel E, Schulze J, Tsankov T V, Czarnetzki U 2015 Plasma Sources Sci. Technol. 24 044006Google Scholar
[52] Lieberman M A, Lichtenberg A J 2005 Principles of Plasma Discharges and Materials Processing (Hoboken, NJ, USA: John Wiley & Sons, Inc.) p268
[53] 张钰如, 高飞, 王友年 2021 物理学报 70 095206Google Scholar
Zhang Y R, Gao F, Wang Y N A 2021 Acta Phys. Sin. 70 095206Google Scholar
[54] Yang W, Zhao S X, Wen D Q, Liu W, Liu Y X, Li X C, Wang Y N 2016 J. Vac. Sci. Technol., A 34 031305Google Scholar
[55] Toneli D A, Pessoa R S, Roberto M, Gudmundsson J T 2015 J. Phys. D: Appl. Phys. 48 325202Google Scholar
[56] Proto A 2021 Ph. D. Dissertation (Iceland: University of Iceland
[57] Stafford L, Khare R, Guha J, Donnelly V M, Poirier J S, Margot J 2009 J. Phys. D: Appl. Phys. 42 055206Google Scholar
[58] Guha J, Donnelly V M 2009 J. Appl. Phys. 105 113307Google Scholar
[59] Boyd R L F, Thomson J B 1959 Proc. R. Soc. London, Ser. A 252 102Google Scholar
[60] Kokkoris G, Goodyear A, Cooke M, Gogolides E 2008 J. Phys. D: Appl. Phys. 41 195211Google Scholar
[61] Dai Z L, Wang Y N, Ma T C 2002 Phys. Rev. E 65 036403Google Scholar
[62] Dai Z L, Wang Y N 2004 Phys. Rev. E 69 036403Google Scholar
[63] Dai Z L, Wang Y N 2002 Phys. Rev. E 66 026413Google Scholar
[64] Dai Z L, Wang Y N 2002 J. Appl. Phys. 92 6428Google Scholar
[65] Dai Z L, Wang Y N 2003 Surf. Coat. Technol. 165 224Google Scholar
[66] Wen D Q, Zhang Q Z, Jiang W, Song Y H, Bogaerts A, Wang Y N 2014 J. Appl. Phys. 115 233303Google Scholar
[67] Hong Y H, Kim T W, Kim B S, Lee M Y, Chung C W 2022 Plasma Sources Sci. Technol. 31 075008Google Scholar
[68] Huang S, Gudmundsson J T 2013 Plasma Sources Sci. Technol. 22 055020Google Scholar
[69] Hennad A, Yousfi M 2010 J. Phys. D: Appl. Phys. 44 025201Google Scholar
[70] Manenschijn A, Janssen G C A M, Van Der Drift E, Radelaar S 1991 J. Appl. Phys. 69 1253Google Scholar
[71] Hayden C, Gahan D, Hopkins M B 2009 Plasma Sources Sci. Technol. 18 025018Google Scholar
[72] Gahan D, Dolinaj B, Hopkins M B 2008 Rev. Sci. Instrum. 79 033502Google Scholar
[73] Edelberg E A, Aydil E S 1999 J. Appl. Phys. 86 4799Google Scholar
[74] Edelberg E A, Perry A, Benjamin N, Aydil E S 1999 J. Vac. Sci. Technol., A 17 506Google Scholar
[75] Edelberg E A, Perry A, Benjamin N, Aydil E S 1999 Rev. Sci. Instrum. 70 2689Google Scholar
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图 5 不同偏压频率下, 带电粒子密度随偏压幅值的变化 (a) Ar+; (b) $ {\text{O}}_2^ + $; (c) O+; (d) O–; (e) $ {\text{Cl}}_2^ + $; (f) Cl+; (g) Cl–; (h) ClO+; (i) 电子密度
Figure 5. Evolutions of the densities of charged species with bias voltage for different bias frequencies: (a) Ar+; (b) $ {\text{O}}_2^ + $; (c) O+; (d) O–; (e) $ {\text{Cl}}_2^ + $; (f) Cl+; (g) Cl–; (h) ClO+; (i) electron density.
表 1 Ar/O2/Cl2混合气体放电中考虑的粒子
Table 1. Plasma species considered in Ar/O2/Cl2 discharges.
基态中性粒子 Ar, O2, O3, O, Cl2 (ν = 0), Cl, ClO 激发态中性
粒子Arm, Arr, Ar(4p), O2(a), O(D),
Cl2 (ν = 1), Cl2 (ν = 2), Cl2 (ν = 3)正离子 Ar+, $ {\text{O}}_2^ + $, O+, $ {\text{Cl}}_2^ + $, Cl+, ClO+ 负离子/电子 O–, Cl–, e No. Reaction ${\gamma _l}$ 1 ${\text{Cl + wall }} \to {\text{ }}\dfrac{{1}}{{2}}{\text{C}}{{\text{l}}_{2}}\left( {\nu = {0}} \right)$ 方程(3) 2 ${\text{Cl + wall }} \to {\text{ }}\dfrac{{1}}{{2}}{\text{ClO}}$ 方程(4) 3 ${\text{O + wall }} \to {\text{ }}\dfrac{{1}}{{2}}{{\text{O}}_{2}}$ 0.09 4 ${\text{O}}\left( {\text{D}} \right){\text{ + wall }} \to {\text{ }}\dfrac{{1}}{{2}}{{\text{O}}_{2}}$ 0.09 5 ${\text{C}}{{\text{l}}_{2}}\left( \nu \right){\text{ + wall }} \to {\text{ C}}{{\text{l}}_{2}}\left( {\nu - {1}} \right)$ 1 6 ${{\text{O}}_{2}}\left( {\text{a}} \right){\text{ + wall }} \to {\text{ }}{{\text{O}}_{2}}$ 0.007 7 ${\text{O}}\left( {\text{D}} \right){\text{ + wall }} \to {\text{ O}}$ 0.1 8 ${\text{A}}{{\text{r}}^ * }{\text{ + wall }} \to {\text{ Ar}}$ 1 表 3 偏压频率为13.56 MHz时, 不同偏压幅值下的时间平均鞘层厚度和鞘层电压降
Table 3. Time-averaged sheath thickness and voltage drop across the sheath for different bias voltage amplitudes, at bias frequency of 13.56 MHz.
25 V 50 V 75 V 100 V 125 V 150 V 175 V 200 V ${\bar d_{\text{s}}}{\text{ /mm}}$ 4.67 4.75 4.79 4.80 4.81 4.85 4.93 5.03 ${\bar V_{\text{s}}}{\text{ /V}}$ 31.32 55.47 79.98 104.63 129.34 154.1 178.88 203.70 -
[1] Efremov A M, Kim D P, Kim C I 2004 IEEE Trans. Plasma Sci. 32 1344Google Scholar
[2] Efremov A M, Kim D P, Kim C I 2003 J. Vac. Sci. Technol., A 21 1568Google Scholar
[3] Bogaerts A, Neyts E, Gijbels R, Van Der Mullen J 2002 Spectrochim Acta, Part B 57 609Google Scholar
[4] Choi S K, Kim D P, Kim C I, Chang E G 2001 J. Vac. Sci. Technol., A 19 1063Google Scholar
[5] Lee Y J, Han H R, Lee J, Yeom G Y 2000 Surf. Coat. Technol. 131 257Google Scholar
[6] Wen D Q, Liu W, Gao F, Lieberman M A, Wang Y N 2016 Plasma Sources Sci. Technol. 25 045009Google Scholar
[7] Wen D, Zhang Y, Lieberman M A, Wang Y 2017 Plasma Processes Polym. 14 1600100Google Scholar
[8] Zhang Y R, Gao F, Li X C, Bogaerts A, Wang Y N 2015 J. Vac. Sci. Technol., A 33 061303Google Scholar
[9] Lee H C, Lee M H, Chung C W 2010 Appl. Phys. Lett. 96 071501Google Scholar
[10] Lee H C, Chung C W 2012 Appl. Phys. Lett. 101 244104Google Scholar
[11] Lee H C, Bang J Y, Chung C W 2011 Thin Solid Films 519 7009Google Scholar
[12] Lee C, Lieberman M A 1995 J. Vac. Sci. Technol., A 13 368Google Scholar
[13] Gudmundsson J T 2004 J. Phys. D: Appl. Phys. 37 2073Google Scholar
[14] Jung J, Kim M S, Park J, Lim C M, Hwang T W, Seo B J, Chung C W 2023 Phys. Plasmas 30 023504Google Scholar
[15] Tong L, Zhang Y R, Huang J W, Zhao M L, Wen D Q, Song Y H, Wang Y N 2021 Phys. Plasmas 28 053512Google Scholar
[16] Tong L, Zhao M L, Zhang Y R, Song Y H, Wang Y N 2023 J. Phys. D: Appl. Phys. 56 365202
[17] Khater M H, Overzet L J 2004 Plasma Sources Sci. Technol. 13 466Google Scholar
[18] Dai Z L, Zhang S Q, Wang Y N 2013 Vacuum 89 197Google Scholar
[19] Zhang S Q, Dai Z L, Song Y H, Wang Y N 2014 Vacuum 99 180Google Scholar
[20] Levko D, Raja L L 2022 J. Vac. Sci. Technol., B 40 052205Google Scholar
[21] Levko D, Upadhyay R R, Suzuki K, Raja L L 2023 J. Vac. Sci. Technol., A 41 012205Google Scholar
[22] Malyshev M V, Donnelly V M, Colonell J I, Samukawa S 1999 J. Appl. Phys. 86 4813Google Scholar
[23] Malyshev M V, Donnelly V M 2000 Plasma Sources Sci. Technol. 9 353Google Scholar
[24] Donnelly V M, Malyshev M V 2000 Appl. Phys. Lett. 77 2467Google Scholar
[25] Malyshev M V, Donnelly V M 2001 J. Appl. Phys. 90 1130Google Scholar
[26] Malyshev M V, Fuller N C M, Bogart K H A, Donnelly V M, Herman I P 2000 J. Appl. Phys. 88 2246Google Scholar
[27] Malyshev M V, Donnelly V M 2000 J. Appl. Phys. 88 6207Google Scholar
[28] Malyshev M V, Donnelly V M 2000 J. Appl. Phys. 87 1642Google Scholar
[29] Thorsteinsson E G, Gudmundsson J T 2010 Plasma Sources Sci. Technol. 19 015001Google Scholar
[30] Thorsteinsson E G, Gudmundsson J T 2010 J. Phys. D: Appl. Phys. 43 115201Google Scholar
[31] Thorsteinsson E G, Gudmundsson J T 2010 J. Phys. D: Appl. Phys. 43 115202Google Scholar
[32] Thorsteinsson E G, Gudmundsson J T 2010 Plasma Sources Sci. Technol. 19 055008Google Scholar
[33] Gudmundsson J T, Hjartarson A T, Thorsteinsson E G 2012 Vacuum 86 808Google Scholar
[34] Zhang Y R, Zhao Z Z, Xue C, Gao F, Wang Y N 2019 J. Phys. D: Appl. Phys. 52 295204
[35] Liu W, Wen D Q, Zhao S X, Gao F, Wang Y N 2015 Plasma Sources Sci. Technol. 24 025035Google Scholar
[36] 范惠泽, 刘凯, 黄永清, 蔡世伟, 任晓敏, 段晓峰, 王琦, 刘昊, 吴瑶, 费嘉瑞 2017 真空科学与技术学报 37 286Google Scholar
Fan H Z, Liu K, Huang Y Q, Cai S W, Ren X M, Duan X F, Wang Q, Liu H, Wu Y, Fei J R 2017 Chin. J. Vac. Sci. Technol. 37 286Google Scholar
[37] Smith S A, Lampert W V, Rajagopal P, Banks A D, Thomson D, Davis R F 2000 J. Vac. Sci. Technol., A 18 879Google Scholar
[38] Lee J M, Chang K M, Lee I H, Park S J 2000 J. Vac. Sci. Technol., B 18 1409Google Scholar
[39] Taube A, Kamiński M, Ekielski M, et al. 2021 Mater. Sci. Semicond. Process. 122 105450Google Scholar
[40] Chung C W, Chung I 2000 J. Vac. Sci. Technol., A 18 835Google Scholar
[41] Park J S, Kim T H, Choi C S, Hahn Y B 2002 Korean J. Chem. Eng. 19 486Google Scholar
[42] Kwon K H, Efremov A, Yun S J, Chun I, Kim K 2014 Thin Solid Films 552 105Google Scholar
[43] Kang S, Efremov A, Yun S J, Son J, Kwon K H 2013 Plasma Chem. Plasma Process. 33 527Google Scholar
[44] Tinck S, Boullart W, Bogaerts A 2009 J. Phys. D: Appl. Phys. 42 095204Google Scholar
[45] Tinck S, Boullart W, Bogaerts A 2011 Plasma Sources Sci. Technol. 20 045012Google Scholar
[46] Tinck S, Bogaerts A, Shamiryan D 2011 Plasma Processes Polym. 8 490Google Scholar
[47] Hsu C C, Coburn J W, Graves D B 2006 J. Vac. Sci. Technol., A 24 1Google Scholar
[48] Efremov A, Amirov I, Izyumov M 2023 Vacuum 207 111664Google Scholar
[49] Hsu C C, Nierode M A, Coburn J W, Graves D B 2006 J. Phys. D: Appl. Phys. 39 3272Google Scholar
[50] Schulze J, Schüngel E, Czarnetzki U 2012 Appl. Phys. Lett. 100 024102Google Scholar
[51] Ahr P, Schüngel E, Schulze J, Tsankov T V, Czarnetzki U 2015 Plasma Sources Sci. Technol. 24 044006Google Scholar
[52] Lieberman M A, Lichtenberg A J 2005 Principles of Plasma Discharges and Materials Processing (Hoboken, NJ, USA: John Wiley & Sons, Inc.) p268
[53] 张钰如, 高飞, 王友年 2021 物理学报 70 095206Google Scholar
Zhang Y R, Gao F, Wang Y N A 2021 Acta Phys. Sin. 70 095206Google Scholar
[54] Yang W, Zhao S X, Wen D Q, Liu W, Liu Y X, Li X C, Wang Y N 2016 J. Vac. Sci. Technol., A 34 031305Google Scholar
[55] Toneli D A, Pessoa R S, Roberto M, Gudmundsson J T 2015 J. Phys. D: Appl. Phys. 48 325202Google Scholar
[56] Proto A 2021 Ph. D. Dissertation (Iceland: University of Iceland
[57] Stafford L, Khare R, Guha J, Donnelly V M, Poirier J S, Margot J 2009 J. Phys. D: Appl. Phys. 42 055206Google Scholar
[58] Guha J, Donnelly V M 2009 J. Appl. Phys. 105 113307Google Scholar
[59] Boyd R L F, Thomson J B 1959 Proc. R. Soc. London, Ser. A 252 102Google Scholar
[60] Kokkoris G, Goodyear A, Cooke M, Gogolides E 2008 J. Phys. D: Appl. Phys. 41 195211Google Scholar
[61] Dai Z L, Wang Y N, Ma T C 2002 Phys. Rev. E 65 036403Google Scholar
[62] Dai Z L, Wang Y N 2004 Phys. Rev. E 69 036403Google Scholar
[63] Dai Z L, Wang Y N 2002 Phys. Rev. E 66 026413Google Scholar
[64] Dai Z L, Wang Y N 2002 J. Appl. Phys. 92 6428Google Scholar
[65] Dai Z L, Wang Y N 2003 Surf. Coat. Technol. 165 224Google Scholar
[66] Wen D Q, Zhang Q Z, Jiang W, Song Y H, Bogaerts A, Wang Y N 2014 J. Appl. Phys. 115 233303Google Scholar
[67] Hong Y H, Kim T W, Kim B S, Lee M Y, Chung C W 2022 Plasma Sources Sci. Technol. 31 075008Google Scholar
[68] Huang S, Gudmundsson J T 2013 Plasma Sources Sci. Technol. 22 055020Google Scholar
[69] Hennad A, Yousfi M 2010 J. Phys. D: Appl. Phys. 44 025201Google Scholar
[70] Manenschijn A, Janssen G C A M, Van Der Drift E, Radelaar S 1991 J. Appl. Phys. 69 1253Google Scholar
[71] Hayden C, Gahan D, Hopkins M B 2009 Plasma Sources Sci. Technol. 18 025018Google Scholar
[72] Gahan D, Dolinaj B, Hopkins M B 2008 Rev. Sci. Instrum. 79 033502Google Scholar
[73] Edelberg E A, Aydil E S 1999 J. Appl. Phys. 86 4799Google Scholar
[74] Edelberg E A, Perry A, Benjamin N, Aydil E S 1999 J. Vac. Sci. Technol., A 17 506Google Scholar
[75] Edelberg E A, Perry A, Benjamin N, Aydil E S 1999 Rev. Sci. Instrum. 70 2689Google Scholar
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