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利用蒙特卡罗方法, 模拟计算了不同线性能量传输(liner energy transfer, LET)的重离子在碳化硅中的能量损失, 模拟结果表明: 重离子在碳化硅中单位深度的能量损失受离子能量和入射深度共同影响; 能量损失主要由初级重离子和次级电子产生, 非电离能量损失只占总能量损失的1%左右; 随着LET的增大, 次级电子的初始角度和能量分布越来越集中; 重离子诱导产生的电荷沉积峰值位置在重离子径迹中心, 在垂直于入射深度方向上呈高斯线性减小分布. 利用锎源进行碳化硅MOSFET单粒子烧毁试验, 结合TCAD模拟得到不同漏极电压下器件内部电场分布, 在考虑电场作用的蒙特卡罗模拟中发现: 碳化硅MOSFET外延层的电场强度越大, 重离子受电场作用在外延层运动的路径越长、沉积能量越多, 次级电子越容易偏向电场方向运动导致局部能量沉积过高.Using the Monte Carlo method, the energy losses in silicon carbide of heavy ions with different linear energy transfers (LETs) are simulated and calculated. The simulation results show that the energy loss per unit depth of heavy ions in silicon carbide is affected by both the ion energy and the incident depth. Primary heavy ions and secondary electrons mainly cause energy loss, and the non-ionization energy loss only accounts for about 1% of the total energy loss. With the increase of LET, the initial angle and energy distribution of the secondary electrons become more and more concentrated. The peak position of the generated charge deposition is in the center of the heavy-ion track, and the distribution is linearly decreasing in Gaussian form in the direction perpendicular to the incident depth. In the californium source experiment of SiC MOSFET, when the drain voltage is 480 V, the device has a single event burnout, and the breakdown voltage of SiC MOSFET is less than 1 V after burnout has occurred. With the experimental results, we carry out the TCAD simulation of SiC MOSFET and obtain the electric field distribution inside the device under different drain voltages. The electric field parameters are used in the Monte Carlo simulation of SiC MOSFET with considering the metal layer. It is found in the Monte Carlo simulation that the greater the electric field of the epitaxial layer, the longer the path of heavy ions moving on the epitaxial layer is and the more the deposited energy, and that the secondary electrons are more likely to move in the direction of the electric field as the electric field increases, resulting in excessive energy deposition in local areas.
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Keywords:
- Monte Carlo method /
- silicon carbide /
- heavy ion /
- energy loss /
- electric field
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图 1 不同LET的重离子入射碳化硅的径迹分布 (a) 34.08 MeV·cm2/mg; (b) 44.73 MeV·cm2/mg; (c) 69.72 MeV·cm2/mg
Fig. 1. Track distribution of heavy ions with different LET incident on silicon carbide: (a) 34.08 MeV·cm2/mg; (b) 44.73 MeV·cm2/mg; (c) 69.72 MeV·cm2/mg
图 2 不同LET的重离子产生的能量损失随入射深度的变化
Fig. 2. The energy loss of heavy ions with different LET changes with the depth of incidence.
图 3 不同粒子造成的能量沉积随LET的变化
Fig. 3. Variation of energy deposition caused by different particles with LET.
图 4 不同LET下总能量损失的空间分布 (a) 34.08 MeV·cm2/mg; (b) 44.73 MeV·cm2/mg; (c) 69.72 MeV·cm2/mg
Fig. 4. Spatial distribution of total energy loss under different LET: (a) 34.08 MeV·cm2/mg; (b) 44.73 MeV·cm2/mg; (c) 69.72 MeV·cm2/mg.
图 5 不同LET下次级电子径迹的空间分布: (a) 34.08 MeV·cm2/mg; (b) 44.73 MeV·cm2/mg; (c) 69.72 MeV·cm2/mg
Fig. 5. Spatial distribution of electron tracks under different LET: (a) 34.08 MeV·cm2/mg; (b) 44.73 MeV·cm2/mg; (c) 69.72 MeV·cm2/mg
图 6 不同LET下次级电子的初始能量及角度分布: (a) 34.08 MeV·cm2/mg; (b) 44.73 MeV·cm2/mg; (c) 69.72 MeV·cm2/mg
Fig. 6. The initial kinetic energy and angle distribution of secondary electron under different LET: (a) 34.08 MeV·cm2/mg; (b) 44.73 MeV·cm2/mg; (c) 69.72 MeV·cm2/mg
图 7 总能量损失在碳化硅中的时间分布随LET的变化
Fig. 7. Time distribution of total energy loss in SiC as a function of LET.
图 8 非电离能量损失在碳化硅中的时间分布随LET的变化
Fig. 8. The time distribution of non-ionizing energy loss in SiC varies with LET.
图 9 不同LET下碳化硅中的非电离能量损失随深度的变化
Fig. 9. The non-ionizing energy loss in SiC varies with depth under different LET.
图 10 不同LET下电荷沉积在垂直于重离子径迹方向的分布
Fig. 10. Distribution of charge deposition perpendicular to the direction of heavy ion tracks under different LET.
图 12 碳化硅MOSFET单粒子烧毁特征 (a)烧毁时瞬态漏电流剧增; (b)击穿特性丧失
Fig. 12. SEB characteristics of silicon carbide MOSFET: (a) Transient leakage current increases sharply when burned out; (b) loss of breakdown characteristics.
图 13 不同漏极偏压下碳化硅MOSFET内部的电场分布 (a)二维分布; (b)一维分布
Fig. 13. The electric field distribution inside the silicon carbide MOSFET under different drain bias voltages: (a) Two-dimensional distribution; (b) one-dimensional distribution.
图 14 碳化硅MOSFET内部结构示意图 (a)切片分析结果; (b)Geant4仿真模型
Fig. 14. Schematic diagram of the internal structure of silicon carbide MOSFET: (a) Slice analysis results; (b) Geant4 simulation model.
图 15 不同漏极偏置电压下碳化硅MOSFET外延层的能量沉积分布 (a)VDrain = 0 V; (b)VDrain = 480 V; (c)VDrain = 1000 V
Fig. 15. Energy deposition distribution of epitaxial layer of silicon carbide MOSFET under different drain bias voltage: (a) VDrain = 0 V; (b) VDrain = 480 V; (c) VDrain = 1000 V.
表 1 选取的重离子种类、能量及其在材料中的射程
Table 1. Selected heavy ion, energy and range of heavy ions in silicon carbide.
重离子 能量/MeV SiC中射程/μm@SRIM SiC中射程/μm@Geant4 SiC中LET /(MeV·cm2·mg–1) Si中LET /(MeV·cm2·mg–1) 铜 (Cu+) 212 22.01 21.5 34.08 32.2 溴 (Br+) 218 19.97 18.5 44.73 42 碘 (I+) 270 19.21 16.5 69.72 65 
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[1] Elasser A, Chow T P 2002 Proc. IEEE 90 969
Google Scholar
[2] Johnson C M, Wright N G, Uren M J, Hilton K P, Rahimo M, Hinchley D A, Knights A P, Morrison D J, Horsfall A B, Ortolland S, O’Neill A G 2001 IEE Proc.: Circuits Devices Syst. 148 101
Google Scholar
[3] Cooper, Jr J A 1997 Phys. Status Solidi A 162 305
Google Scholar
[4] 周拥华, 张义门, 张玉明, 孟祥志 2004 11 3710
Google Scholar
Zhou Y H, Zhang Y M, Zhang Y M, Meng X Z 2004 Acta Phys. Sin. 11 3710
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[5] 秦希峰, 梁毅, 王凤翔, 李双, 付刚, 季艳菊 2011 60 066101
Google Scholar
Qin X F, Liang Y, Wang F X, Li S, Fu G, Ji Y J 2011 Acta Phys. Sin. 60 066101
Google Scholar
[6] Zhang X 2013 Ph. D. Dissertation (Nashville: Vanderbilt University)
[7] 白玉新, 刘俊琴, 李雪, 曹英健, 张建国, 仲悦 2011 航天标准化 03 10
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Bai Y X, Liu J Q, Li X, Cao Y J, Zhang J G, Zhong Y 2011 Aerospace Standardization 03 10
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[8] 张林, 张义门, 张玉明, 韩超, 马永吉 2009 58 2737
Google Scholar
Zhou L, Zhang Y M, Zhang Y M, Han C, Man Y J 2009 Acta Phys. Sin. 58 2737
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[9] Messenger S R, Burke E A, Summers G P, Xapsos M A, Walters R J, Jackson E M, Weaver B D 1999 IEEE Trans. Nucl. Sci. 46 1595
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[10] Messenger S R, Burke E A, Xapsos M A, Summers G P, Walters R J, Jun I 2003 IEEE Trans. Nucl. Sci. 50 1919
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[11] Mizuta E, Kuboyama S, Abe H, Iwata Y, Tamura T 2014 IEEE Trans. Nucl. Sci. 61 1924
Google Scholar
[12] Witulski A F, Arslanbekov R, Raman A, Schrimpf R D, Sternberg A L, Galloway K F, Javanainen A, Grider D, Lichtenwalner D J, Hull B 2017 IEEE Trans. Nucl. Sci. 65 256
Google Scholar
[13] Javanainen A, Galloway K F, Nicklaw C, Bosser A L, Cavrois V F, Lauenstein J M, Pintacuda F, Reed R A, Schrimpf R D, Weller R A, Virtanen A 2016 IEEE Trans. Nucl. Sci. 64 415
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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