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课件推送(终端区电场与钝化-半导体工艺知识站)

  • 2026-06-22 16:33:32
课件推送(终端区电场与钝化-半导体工艺知识站)
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题目:功率器件钝化层 |终端区电场与钝化
时间:2026年6

来源:半导体工艺知识站

原创:SEMIKnowledgeHub

链接:功率器件钝化层 |终端区电场与钝化

关键信息摘录如下:

1、高压下,边缘比中心失效?(为什么呢?笔者存疑;继续往下看)

2、三个问题:

2.1、边缘为什么先击穿?

PN结边角电场激增;具体为边-形成柱面,角-形成球面;曲率半径越小,电势线越密集,峰值电场越高;

当峰值电场>临界电场Ec(硅中约4010ND^(1/8),单位V/cm,掺杂浓度ND单位cm-3)时,发生击穿;

临界电场派生的临界电荷Qc?单位cm-2,等于临界电场Ec*硅介电常数,再除以单位电荷,硅中约1E12-2.6E12/cm2;

临界电荷Qc,指雪崩击穿前耗尽层区被平衡的电荷上限,核心为电荷平衡(即耗尽区的一个电子要对应一个空穴,这个是终端设计的精髓所在);

JTE/VLD等终端(靠剂量调(这个“调”用的也很精髓,水多了加面,面多了加水,哈哈)电场的设计),最优剂量约1.5E12-2.5E12/cm2;

2.2、工程上靠哪些结构把边缘电场摊(这个摊用的绝妙)开?

设计目标:终端结构把主结边缘的电场峰值摊平,让其低于临界电场Ec;

实现路径:两类终端,按需取用;

低压浅结的分立器件多选场板;几百伏到几千伏多用JTE或JTE叠场板;几千伏以上的高压IGBT与二极管,VLD的宽容差与窄宽度更有优势;横向集成器件离不开 RESURF。终端之外还要看最外侧到划片边缘的区域,沟道截止环把横向耗尽区终止在可控位置,避免向划片损伤区与封装污染区扩展。终端是无源区,越宽越能摊开电场,有效有源区的比例却随之下降,设计本质上是在耐压裕度、表面电荷容差、工艺复杂度与无源面积之间折中。

a、场限环/JTE/VLD等,用横向扩展的耗尽区或渐变掺杂重塑半导体内部电场;

2.2.1、场限环:

终端结构:浮空P环,不接电极;

结构参数:环数量(由目标耐压、结深、漂移区掺杂、终端宽度与场氧电荷等决定;单个环可将击穿电压提升10%-80%;随环数增加,击穿电压增加但很快饱和(7环提升至85%,继续增加可至97%左右)),环间距(由内向外递增);

物理机理:反偏时,主结耗尽区逐级触及各环,形成多个较低的电场峰;

优点:可与主结同步形成,无需增加工艺步骤,可靠性高;

缺点:占用面积大,对终端表面与氧化层电荷高度敏感;

2.2.2、结终端扩展JTE:

终端结构:主结边缘一圈剂量受控的浅P-延伸区;

结构参数:JTE剂量,优值约:1E12-2E12/cm2(剂量偏低,电场峰值在主结,而剂量偏高则电场防止移至JTE末端),对应临界电荷Qc;JTE区数量(单区JTE剂量容差窄,仅约1E12/cm2;而双区JTE采用阶梯式点恶化分布将表面电场进一步铺平,明显放宽了剂量容差);

物理机理:反偏时,JTE区在体内电场达到临界电场前完全耗尽,把电压沿延伸区宽度横向铺上,表面电场低于体内,最终击穿电压逼近理想平面结;

优点:击穿电压高;

缺点:对剂量敏感,剂量容差小;

2.2.3、横向变掺杂VLD:

终端结构:一排尺寸渐变的小注入窗口配合高温推进,把杂质横向展开形成自主结向外连续递减的分布,获得近乎均匀的表面电场;

结构参数:JTE剂量,优值约:1E12-2E12/cm2(剂量偏低,电场峰值在主结,而剂量偏高则电场防止移至JTE末端),对应临界电荷Qc;JTE区数量(单区JTE剂量容差窄,仅约1E12/cm2;而双区JTE采用阶梯式点恶化分布将表面电场进一步铺平,明显放宽了剂量容差);

物理机理:反偏时,JTE区在体内电场达到临界电场前完全耗尽,把电压沿延伸区宽度横向铺上,表面电场低于体内,最终击穿电压逼近理想平面结;

优点:击穿电压高,剂量容差比单区JTE宽约2.8倍,终端宽度明显小于场板结构;

缺点:文中为提及;

b、场板等,采用上方电极经介质电容耦合改变半导体表面电场,场氧等即是场板的耦合介质,也是其他结构公用的表面基底;

2.2.4、场氧:

终端结构:即是场板的耦合介质,也是上层钝化的表面基底;

结构参数:厚度(0.6-1.4um;LOCOS鸟嘴会改变局部电场);生长方式(热氧化层的界面电荷远低于沉积氧化层,终端底层优选热氧化层);

物理机理:耦合介质,钝化膜组成;

优点:降低界面电荷;

缺点:文中为提及;

2.2.5、场板:

终端结构:把主结电极延伸至场氧上方,通过电容耦合迫使下方耗尽层外扩

结构参数:介电常数(耦合强度由介质介电常数和厚度之比决定)、场氧厚度(太薄,峰值电场被推进氧化层,在场板边缘发生氧化层击穿;太厚,则场板离半导体太远,几乎不起作用);结深度(对浅结高压器件,场板的展开效果优于场环);

物理机理:通过电容耦合迫使下方耗尽层外扩,把峰值电场从主结边缘移至场板边缘;

优点:电容耦合调制电场;

缺点:文中为提及;

2.2.6、半绝缘多晶硅:

终端结构:在终端表面沉积含氧多晶硅薄膜;

结构参数:电阻性场板,

物理机理:等效一个连续分布的电阻性场板,在均匀化表面电场的同时屏蔽外来电荷

优点:均匀化表面电场,屏蔽外来电荷;

缺点:电阻性电流会让高dV/dt下的动态击穿电压明显退化,高速开关场合需谨慎;

2.3、当这些结构依赖介质与界面来实现时,器件在高压湿热下从哪里退化(这个蛮关键的,失败是成功之母!)?

2.3.1、终端钝化:

钝化影响终端结构,既要参与电场设计、把边缘电场摊平,又要充当阻挡层、挡住会破坏这套设计的可动离子与水汽。具体如下:

a:表面电荷,SiO₂ 中的固定电荷、可动离子与界面态会在轻掺杂表面感生反型层或积累层,形成表面漏电沟道并改写边缘电场;

b、场板耦合,介质厚度与介电常数设定场板对表面电场的影响;

c、峰值电场的位置,钝化层固定电荷的符号与密度决定峰值出现在主结边缘还是 JTE、场板末端,可动电荷还会随偏压和时间漂移,使峰值位置缓慢迁移。

d、湿气路径,水汽多沿钝化叠层缺陷、层间界面、芯片边缘与金属侧壁侵入,可动 Na⁺ 还能沿金属线扩散后横向爬到终端,这条路径决定终端钝化能否挡住外来物;

2.3.2、终端考核:

终端设计得再精细,长期稳定性往往取决于终端表面的介质与界面。Si 终端失效集中在两类外来物,可动的 Na⁺ 与无处不在的水汽,二者常在高温、高湿、高反偏下一起发作;

a、Na+迁移;

Na⁺在室温下已可缓慢漂移,反偏高场叠加高温时能在数分钟内从氧化层体内漂到SiO₂与Si界面,堆积出正电荷层,使下方轻掺杂表面局部反型,结果是终端击穿电压下降、表面漏电上升;

压制Na⁺的标准手段是PSG与BPSG,磷氧网络以静电方式俘获并中和 Na⁺,工程经验是 2% 到 4% 的磷含量即足以有效阻挡;

b、湿气沿钝化层与界面进入终端

水汽进入终端后先在表面形成吸附水膜,抬高表面电导、形成漏电沟道,再在高场下驱动电化学反应,腐蚀铝金属化与氮化硅;

c、HTRB 与 H3TRB

常温下测漏电、击穿与外观都合格,并不能证明可动离子与湿气这两条路径过关,它们要在HTRB与H3TRB这类长期应力下才暴露;

高温反偏(HTRB)让器件在接近最高额定结温的150°C 到175 °C下承受80% 到100% 的额定阻断电压,通常持续1000小时,考查漏电漂移与参数退化。高温高湿反偏(H3TRB)在85°C、85%相对湿度下加反偏,专门检验终端钝化与封装防潮在湿气加电场下的稳定性;

终端失效的定位通常从反向I–V漂移入手,先确认异常出现在反向特性而非正向参数,再借助热点定位找到漏电集中的位置,必要时辅以截面分析与离子分布表征。终端与钝化层的问题,往往先表现为反向特性的漂移;

3、总结:

3.1、边角处小的曲率半径把等势线挤密,峰值电场先到临界电场Ec,发生击穿;

3.2、终端结构(场环、JTE、VLD、场板等,理念为电荷平衡)试图将边缘耐压回复至理想平面结;

3.3、终端长期可靠(高压高湿下)工作,靠的是钝化和界面;钝化叠层既参与电场设计,又要挡住会扰动电场分布的可动离子和水汽;

3.4、几何图形给出起点,终端结构把耐压拉回来,钝化与界面决定它能不能守住;

3.5、SiC临界电场高约一个量级,终端承受的场强更极端,可用的钝化策略也随之不同(文中未展开,估计是这个系列的后续);

推荐理由:该篇对终端结构做了一个较为全面的总结,很见功底;笔者揣测应该还有很多料(比较口语化,能感觉到是很多case的凝练结果;文末提到知识星球,难道这个球真有料?!),推荐大家伙一起深究,深追!!!

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  1. CONNECT:[ UseTime:0.000639s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000784s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000339s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000282s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000485s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000556s ]
  8. SELECT * FROM `article` WHERE `id` = 514661 LIMIT 1 [ RunTime:0.015148s ]
  9. UPDATE `article` SET `lasttime` = 1782137174 WHERE `id` = 514661 [ RunTime:0.015579s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.003644s ]
  11. SELECT * FROM `article` WHERE `id` < 514661 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001292s ]
  12. SELECT * FROM `article` WHERE `id` > 514661 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.021662s ]
  13. SELECT * FROM `article` WHERE `id` < 514661 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.012977s ]
  14. SELECT * FROM `article` WHERE `id` < 514661 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.010853s ]
  15. SELECT * FROM `article` WHERE `id` < 514661 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.027925s ]
0.184145s