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课件推送(功率器件的钝化层-半导体工艺知识站)

  • 2026-06-19 13:57:50
课件推送(功率器件的钝化层-半导体工艺知识站)
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题目:功率器件的钝化层|一层介质,四个身份
时间:2026年6

来源:半导体工艺知识站

原创:SEMIKnowledgeHub

链接:功率器件的钝化层|一层介质,四个身份

关键信息摘录如下:

1、钝化影响功率器件的性能和可靠性;

2、钝化覆盖在芯片上层,起到阻挡水汽与沾污等作用;还会影响器件的电场分布;

3、钝化通常为多叠层结构,包括SiO2(热氧化或沉积)、SiN(PECVD)和聚酰亚胺等;

4、钝化层的作用(身份):界面态钝化、电场调制、阻挡离子/水汽、机械保护;

4.1、界面态钝化:压低半导体的表面态、界面态和陷阱;

Si/SiO₂界面,硅原子周期性终端,留下未配对电子的悬挂键‌(≡Si·),即Pb中心;

高浓度的 Pb 中心会导致界面态密度(Dit)升高,界面态既是复合中心导致漏电增大,又是俘获中心引起阈值漂移,迁移率降低;

450 °C,N2/H2或 Ar/H2 退火,让氢与悬挂键结合,形成稳定的 ‌≡Si-H‌ 结构,从而降低界面态;Si(100)/SiO2界面的Dit约E10cm-2·eV-1量级;

4.2、电场调制:钝化层会直接改变半导体表面的电场分布;

钝化层参数:厚度、介电常数和固定电荷Qf;

界面没有电荷时,电位移法向分量连续,介质内电场乘以其介电常数等于硅内电场乘以硅介电常数(即:ε1*E1=ε21*E2);

硅相对介电常数11.7,SiO2约3.9,即SiO2介质内电场是硅的约3倍;

固定电荷Qf直接扰动终端区的电场分布;

4.3、阻挡层:阻挡Na+/K+等碱金属离子和水汽;

Na+/K+等碱金属离子在SiO2中可漂移(室温、中等电场下),迁移至界面处引起漏电增大等;

水汽沿着缺陷、界面与边缘路径进入终端区,在高温高湿高电场下提高表面电导,诱发离子迁移和电化学腐蚀;

工程经验:水汽更多沿针孔、微裂纹、台阶覆盖薄弱处、金属边缘、焊盘开口,划片边缘渗入;薄弱点集中在开口、边缘和台阶;影响HTRB、H3TRB、THB考核;

致密的SiN(PECVD)可阻挡水汽,而PSG/BPSG中的磷可俘获Na+/K+等碱金属;

4.4、机械保护:承受机械与热的应力,包括封装应力、温度循环、划片边缘损伤、厚金属应力与有机材料吸潮膨胀;

致密的SiN通常伴随高的应力,易开裂;

聚酰亚胺(PI)较大的弹塑性变形,适用于做顶部钝化层;

5、钝化层的不同要求:有源区/终端区
钝化作用:界面态钝化、电场调制、阻挡离子/水汽、机械保护;
5.1、有源区钝化主要作用:界面态钝化;
首要任务:控制栅氧界面的质量与长期可靠性;
失效表现:阈值漂移、跨导和迁移率退化,栅漏电等;
设计考量:低的界面态Dit、低可动离子、稳定的栅介质;
考核指标:HTGB等;
5.2、终端区钝化主要作用:电场调制、阻挡离子/水汽、机械保护;
首要任务:重塑电场,承受阻断电压、抑制表面沟道、阻挡外来电荷和水汽;
设计考量:介质材质、厚度、介电常数、固定电荷;
失效表现:击穿电压退化、漏电增大,H3TRB/HV-THB失效;
考核指标:HTRB、H3TRB/HV-THB等;
6、钝化考核和优化:
既要横向看,也要纵向用。横向看,一个身份连着一项判据、一类考核和一组失效现象;纵向用,一个器件常温下全部通过、却在 H3TRB 之后漏电飙升,问题大概率落在阻挡身份与终端区的交叉处。
推荐理由:该篇给钝化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:0.001184s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001869s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.030190s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000826s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001699s ]
  6. SELECT * FROM `set` [ RunTime:0.000628s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001772s ]
  8. SELECT * FROM `article` WHERE `id` = 514031 LIMIT 1 [ RunTime:0.001274s ]
  9. UPDATE `article` SET `lasttime` = 1781889961 WHERE `id` = 514031 [ RunTime:0.057015s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.012361s ]
  11. SELECT * FROM `article` WHERE `id` < 514031 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001506s ]
  12. SELECT * FROM `article` WHERE `id` > 514031 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005311s ]
  13. SELECT * FROM `article` WHERE `id` < 514031 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002015s ]
  14. SELECT * FROM `article` WHERE `id` < 514031 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006878s ]
  15. SELECT * FROM `article` WHERE `id` < 514031 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004270s ]
0.302958s