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Capacitively coupled plasma (CCP) has gain wide attention due to its important applications in industry. The researches of CCP mainly focus on the discharge characteristics and plasma parameters under different discharge conditions to obtain a good understanding of the discharge, find good methods of controlling the charged particle properties, and improve the process performance and efficiency. The controlling of plasma parameters is based on the following three aspects: gas, chamber, and power source. Changing these discharge conditions can directly influence the sheath dynamics and the charged particle heating process, which can further influence the electron and ion distribution functions, the plasma uniformity, and the production of neutral particles, etc. Based on a review of the recent years’ researches of CCP, the electron heating dynamics and several common methods of controlling the plasma parameters, i.e. voltage waveform tailoring, realistic secondary electron emission, and magnetized capacitively coupled plasma are introduced and discussed in detail in this work.
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Keywords:
- capacitively coupled plasma /
- electron heating /
- electron dynamics /
- simulation methods and experiments
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图 5 (a) 时空分布的电子碰撞电离图; (b) 电场图; (c) 电子密度图. 放电条件: 四氟化碳气体, L = 1.5 cm, P = 90 Pa, f = 40 MHz, 功率20 W, 单频波[79]
Figure 5. Spatio-temporal plots of the ionization rate (a), electric field (b) and electron density (c). The discharge conditions are: CF4 gas, L = 1.5 cm, P = 90 Pa, f = 40 MHz, single frequency voltage waveform with a power 20 W[79].
图 6 (a) CF4放电中, 实验测得电子碰撞激发速率的时空分布图; (b) PIC/MCC模拟的电子碰撞电离速率时空分布图. 放电条件: L = 1.5 cm, P = 100 Pa, f = 8 MHz, V0 = 300 V[49]
Figure 6. (a) Spatio-temporal plots of the exitation rate from experiment; (b) ionization rate from PIC/MCC simulations. The discharge conditions: CF4 gas, L = 1.5 cm, P = 100 Pa, f = 8 MHz, V0 = 300 V[49].
图 7 时空分布的电子碰撞解离速率图(第一列); 电子碰撞电离速率图(第二列); 电场图(第三列); 净电荷密度图(第四列)和电子吸收功率图(第五列); 放电条件: 氧气, L = 3 cm, P = 40 Pa, f = 6 MHz, V0 = 200 V[80]
Figure 7. Spatio-temporal plots of the dissociation rate (first column), ionization rate (second column), electric field (third column), charge density (fourth column), and electron power absorption rate (fifth column). The discharge conditions: oxygen gas, L = 3 cm, P = 40 Pa, f = 6 MHz, V0 = 200 V[80].
图 8 (a) 放电中心位置的电流密度图; (b) 功率源极板鞘层电压图; (c) 鞘层电压的傅里叶分析图. 放电条件: 氩气, L = 2 cm, P = 20 mTorr, f = 13.56 MHz, Δτ = 6 ns, V0 = 400 V, 高斯波形
Figure 8. (a) Current density at the discharge center; (b) voltage drop of the sheath at the powered electrode; (c) the Fourier spectrum of the sheath voltage at the powered electrode. Discharge conditions: Ar gas, L = 2 cm, P = 20 mTorr, f = 13.56 MHz, Δτ = 6 ns, V0 = 400 V, Gaussian waveform.
图 9 时空分布的(a)电场图、(b) 电子吸收功率图、(c) 电子碰撞激发率图. 放电条件: L = 2 cm, P = 20 mTorr, f = 13.56 MHz, Δτ = 6 ns, V0 = 400 V, 高斯波形
Figure 9. Spatio-temporal plots of electric field (a), electron power absorption (b), and ionization rate (c). Discharge conditions: Argon gas, L = 2 cm, P = 20 mTorr, f = 13.56 MHz, Δτ = 6 ns, V0 = 400 V, Gaussian waveform.
图 10 PIC/MCC及玻尔兹曼分析模型给出的t/TRF = 0.5时, 磁场为0 G (a) 和200 G (b) 时接地极板附近电场的空间分布图. 放电条件: 氧气, L = 2.5 cm, P = 100 mTorr, f = 13.56 MHz, V0 = 300 V[15]
Figure 10. Spatial distribution of the electric field near the grounded electrode from the PIC/MCC simulation and Boltzmann term analysis model at the time t/TRF = 0.5 at B = 0 G (a) and B = 200 G (b). Discharge conditions: oxygen gas, L = 2.5 cm, P = 100 mTorr, f = 13.56 MHz, V0 = 300 V[15].
图 12 不同相位角下, 功率极板上的氩离子能量分布. 放电条件: L = 2.5 cm, P = 103 mTorr, f1 = 13.56 MHz, f2 = 27.12 MHz, V0 = 150 V[117]
Figure 12. Ion energy distribution at the powered electrode as a function of the phase angle. Discharge conditions: L = 2.5 cm, P = 103 mTorr, f1 = 13.56 MHz, f2 = 27.12 MHz, V0 = 150 V[117].
图 14 随相位角的变化, 电子密度空间分布图. 放电条件: P = 200 mTorr, f = 13.56 MHz, V0 = 100 V, 两个半径为15 cm的平行板电极, 电极间隙为3 cm, 电极和侧壁之间的距离为5 cm[123]
Figure 14. Spatial distributions of the electron density at different phase angles. Discharge conditions: P = 200 mTorr, f = 13.56 MHz, V0 = 100 V; the discharge is two plane and parallel electrodes with radii of 15 cm; the electrode gap is 3 cm, and the distance between electrodes and side-walls is 5 cm[123].
图 15 不同电压下, A和B两种情况下离子密度峰值及其比值, 其中情况A为两个极板材料都是铜; 情况B为功率电极材料为二氧化硅, 接地电极材料为铜; 放电条件: 氩气, L = 4.0 cm, P = 2.0 Pa, f = 13.56 MHz[138]
Figure 15. Peak electron density in case A and case B and the peak density ratio as a function of the driving voltage amplitude. In case A, the surface material is Cu for both the powered and grounded electrode. In case B, the powered electrode is made of SiO2, while the grounded electrode is made of Cu. Discharge conditions: Argon gas, L = 4 cm, P = 2.0 Pa, f = 13.56 MHz[138].
图 16 时空分布的电场图(第一行)、电子功率吸收功率图(第二行)和电离速率图(第三行); 在磁场B = 0 G (第一列)、B = 50 G (第二列)、B = 100 G (第三列)和B = 200 G (第四列)下的时空分布图. 放电条件: 氧气, L = 2.5 cm, P = 100 mTorr, f = 13.56 MHz, V0 = 300 V[15]
Figure 16. Spatio-temporal plots of the electric field (first row), electron power absorption rate (second row), and ionization rate (third row) at B = 0, 50, 100, 200 G. Discharge conditions: oxygen gas, L = 2.5 cm, P = 100 mTorr, f = 13.56 MHz, V0 = 300 V[15].
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