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重离子辐照导致的SiC肖特基势垒二极管损伤机理

彭超 雷志锋 张战刚 何玉娟 陈义强 路国光 黄云

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重离子辐照导致的SiC肖特基势垒二极管损伤机理

彭超, 雷志锋, 张战刚, 何玉娟, 陈义强, 路国光, 黄云

Damage mechanism of SiC Schottky barrier diode irradiated by heavy ions

Peng Chao, Lei Zhi-Feng, Zhang Zhan-Gang, He Yu-Juan, Chen Yi-Qiang, Lu Guo-Guang, Huang Yun
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  • 基于高能Ta离子辐照研究了SiC肖特基势垒二极管的失效模式和机理, 实验表明辐照过程中的反向偏置电压是影响SiC肖特基势垒二极管器件失效的关键因素. 当器件反向偏置在400 V时, 重离子会导致器件的单粒子烧毁, 辐照后的器件出现了因SiC材料熔融形成的“孔洞”; 当器件反向偏置在250—300 V时, 器件失效表现为关态漏电流随着离子注量增加而增加, 且器件的偏压越高, 重离子导致的漏电增加率也越高. 对于发生漏电增加的器件, 基于显微分析技术发现了分布在整个有源区内重离子导致的漏电通道. TCAD仿真结果表明, 重离子入射会导致器件内部的晶格温度上升, 且最大晶格温度随着偏置电压的增加而增加. 当偏置电压足够大时, 器件内部的局部晶格温度达到了SiC材料的熔点, 最终导致单粒子烧毁; 当偏置电压较低时, 重离子入射导致的晶格温度增加低于SiC材料的熔点, 因此不会造成烧毁. 但由于器件内部最大的晶格温度集中在肖特基结附近, 且肖特基金属的熔点要远低于SiC材料, 因此这可能导致肖特基结的局部损伤, 最终产生漏电通路.
    In this paper, the failure mode and mechanism of silicon carbide (SiC) Schottky barrier diode (SBD) irradiated by high-energy tantalum (Ta) ions are studied. The experimental results show that the reverse bias voltage during irradiation is the key factor causing the failure of SiC SBDs. When the reverse bias of the device is 400 V, the heavy ions will cause the single event burnout (SEB), and a “hole” formed by the melting of SiC material appears in the irradiated device. When the reverse bias is 250–300 V, the failure is manifested as the off state leakage current increases with the ion fluence. The higher the bias voltage of the device, the higher the leakage increase rate caused by heavy ions. For the devices with increased leakage, the leakage channels caused by heavy ions are found in the whole active region, based on microscopic analysis. The TCAD simulation results show that the incidence of heavy ions will lead the lattice temperature to increase in the device, and the maximum lattice temperature increases with bias voltage increasing. When the bias voltage is large enough, the local lattice temperature inside the device reaches the melting point of SiC material, resulting in SEB. When the bias voltage is relatively low, the lattice temperature is lower than the melting point of SiC material, so it will not cause burnout. However, the maximum lattice temperature in the device is concentrated near the Schottky junction, and the melting point of Schottky metal is much lower than that of SiC material. This may lead the Schottky junction to damage locally and eventually produce leakage path.
      通信作者: 彭超, pengchaoceprei@qq.com
    • 基金项目: 国家自然科学基金(批准号: 12075065)、广东省基础与应用基础研究基金(批准号: 2019A1515012213, 2021B1515120043)和广州市科技计划(批准号: 202102021201)资助的课题.
      Corresponding author: Peng Chao, pengchaoceprei@qq.com
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 12075065), the Guangdong Basic and Applied Basic Research Foundation, China (Grant Nos. 2019A1515012213, 2021B1515120043), and the Science and Technology Program of Guangzhou, China (Grant No. 202102021201).
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  • 图 1  实验用SiC-SBD器件 (a) 开封后的光学显微镜顶视图; (b) 截面SEM图

    Fig. 1.  Device of SiC-SBD used in our experiment: (a) Top view of optical microscope after de-capsulated; (b) SEM diagram of cross-section.

    图 2  重离子辐照在线测试布局

    Fig. 2.  On-line test layout of heavy ion irradiation.

    图 3  不同偏置电压Vbias辐照过程中, 器件关态漏电流随时间的变化关系 (a) Vbias = 100—300 V; (b) Vbias = 400 V

    Fig. 3.  Off-state leakage current as a function of time during irradiation under different biases Vbias: (a) Vbias= 100–300 V; (b) Vbias = 400 V.

    图 4  辐照后器件的EMMI测试结果 (a) SEB的器件; (b)关态漏电增加的器件

    Fig. 4.  EMMI analysis results for the irradiated devices: (a) Device of SEB; (b) device with leakage current increase.

    图 5  发生SEB的SBD器件的失效区域SEM图像 (a) 顶视图; (b)—(f) 分别对应位置1—5处的截面图

    Fig. 5.  SEM images of failure area for SBD device with SEB: (a) Top view; (b)–(f) cross-section image corresponding to the line 1–5, respectively.

    图 6  (a) 关态漏电增加器件背面的EMMI测试结果; (b) 320 μm×432 μm区域的局部放大图(图(a)红色虚线范围)

    Fig. 6.  (a) Back-side EMMI analysis result for the irradiated device with leakage current increase; (b) enlarged view of 320 μm×432 μm area (Area surrounded by the red dotted line in Fig.(a)).

    图 7  器件截面SEM形貌图 (a) 辐照后发生漏电增加的器件; (b) 未辐照器件

    Fig. 7.  SEM morphology of the device cross-section: (a) The irradiated device of leakage current increasing; (b) pristine device.

    图 8  发生漏电增加器件辐照前后的I-V特性曲线

    Fig. 8.  I-V characteristics of the device with the leakage current increase before and after irradiation.

    图 9  不同反向偏压下离子入射导致的(a)阴极瞬态电流密度和(b)最大晶格温度随时间的变化

    Fig. 9.  (a) Transient current density and (b) maximum lattice temperature as a function of time when heavy ion strikes under the different bias voltages.

    图 10  离子入射SBD导致的沿离子径迹上的电场分布仿真 (a) Vr = 850 V; (b) Vr = 250 V

    Fig. 10.  Simulated electric field as a function of distance along the ion track: (a) Vr = 850 V; (b) Vr = 250 V.

    图 11  重离子入射不同时间后SiC-SBD器件内部的晶格温度分布 (a) 400 ps; (b) 1 ns; (c) 5 ns; (d) 10 ns

    Fig. 11.  Simulation of lattice temperature in SiC-SBD after the heavy ion incidence at different times: (a) 400 ps; (b) 1 ns; (c) 5 ns; (d) 10 ns.

  • [1]

    Casady J B, Johnson R W 1996 Solid-State Electron. 39 1409Google Scholar

    [2]

    Kimoto T, Cooper J A 2014 Fundamentals of Silicon Carbide Technology: Growth, Characterization, Devices and Applications (Singapore: John Wiley & Sons Press) p16

    [3]

    张林, 肖剑, 邱彦章, 程鸿亮 2011 物理学报 60 056106Google Scholar

    Zhang L, Xiao J, Qiu Y Z, Cheng H L 2011 Acta Phys. Sin. 60 056106Google Scholar

    [4]

    Ino K, Miura M, Nakano Y, Aketa M, Kawamoto N 2019 IEEE International Conference on Electron Devices and Solid-State Circuits (EDSSC) Xi'an, China, June 12–14 2019 p1

    [5]

    张鸿, 郭红霞, 潘霄宇, 雷志锋, 张凤祁, 顾朝桥, 柳奕天, 琚安安, 欧阳晓平 2021 物理学报 70 162401Google Scholar

    Zhang H, Guo H X, Pan X Y, Lei Z F, Zhang F Q, Gu Z Q, Liu Y T, Ju A A, Ouyang X P 2021 Acta Phys. Sin. 70 162401Google Scholar

    [6]

    Yu C H, Wang Y, Bao M T, Li X J, Yang J Q, Tang Z H 2021 IEEE Trans. Electron. Dev. 68 5034Google Scholar

    [7]

    Yu C H, Wang Y, Li X J, Liu C M, Luo X, Cao F 2018 IEEE Trans. Electron. Dev. 65 5434Google Scholar

    [8]

    McPherson J A, Kowal P J, Pandey G K, Chow T P, Ji W, Woodworth A A 2019 IEEE Trans. Nucl. Sci. 66 474Google Scholar

    [9]

    Ball D R, Hutson J M, Javanainen A, Lauenstein J M, Galloway K F, Johnson R A, Alles M L, Sternberg A L, Sierawski B D, Witulski A F, Reed R A, Schrimpf R D 2020 IEEE Trans. Nucl. Sci. 67 22Google Scholar

    [10]

    Akturk A, McGarrity J M, Goldsman N, Lichtenwalner D, Hull B, Grider D, Wilkins R 2018 IEEE Trans. Nucl. Sci. 65 1248Google Scholar

    [11]

    Witulski A F, Ball D R, Galloway K F, Javanainen A, Lauenstein J M, Sternberg A L, Schrimpf R D 2018 IEEE Trans. Nucl. Sci. 65 1951Google Scholar

    [12]

    Zhou X, Jia Y, Hu D, Wu Y 2019 IEEE Trans. Electron. Dev. 66 2551Google Scholar

    [13]

    Soelkner G, Kaindl W, Treu M, Peters D 2007 Mater. Sci. Forum 556 851Google Scholar

    [14]

    Martinella C, Natzke P, Alia R G, Kadi Y, Niskanen K, Rossi M, Jaatinen J, Kettunen H, Tsibizov A, Grossner U, Javanainen A 2022 Microelectron. Rel. 128 114423Google Scholar

    [15]

    Martinella C, Ziemann T, Stark R, Tsibizov A, Voss K O, Alia R G, Kadi Y, Grossner U, Javanainen A 2020 IEEE Trans. Nucl. Sci. 67 1381Google Scholar

    [16]

    Javanainen A, Galloway K F, Nicklaw C, Bosser A L, Ferlet-Cavrois V, Lauenstein J M, Pintacuda F, Reed R A, Schrimpf R D, Weller R A, Virtanen A 2017 IEEE Trans. Nucl. Sci. 64 415Google Scholar

    [17]

    Mizuta E, Kuboyama S, Abe H, Iwata Y, Tamura T 2014 IEEE Trans. Nucl. Sci. 61 1924Google Scholar

    [18]

    Javanainen A, Muinos H V, Nordlund K, Djurabekova F, Galloway K F, Turowski M, Schrimpf R D 2018 IEEE Trans. Device Mater. Reliab. 18 481Google Scholar

    [19]

    于庆奎, 张洪伟, 孙毅, 梅博, 魏志超, 李晓亮, 王贺, 吕贺, 李鹏伟, 曹爽, 唐民 2019 现代应用物理 10 010602Google Scholar

    Yu Q K, Zhang H W, Sun Y, Mei B, Wei Z C, Li X L, Wang H, Li P W, Cao S, Tang M 2019 Modern Appl. Phys. 10 010602Google Scholar

    [20]

    Ziegler J F, Ziegler M D, Biersack J P 2010 Nucl. Instrum. Meth. Phys. Res. B 268 1818Google Scholar

    [21]

    Synopsys 2014 Sentaurus Device User Guide (Mountain View, CA: Synopsys Inc.) p53

    [22]

    Shoji T, Nishida S, Hamada K, Tadano H 2014 Jap. J. Appl. Phys. 53 04EP03Google Scholar

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出版历程
  • 收稿日期:  2022-04-06
  • 修回日期:  2022-05-06
  • 上网日期:  2022-08-25
  • 刊出日期:  2022-09-05

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