中国半导体行业协会封装分会会刊

中国电子学会电子制造与封装技术分会会刊

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电子与封装 ›› 2019, Vol. 19 ›› Issue (12): 46 -50. doi: 10.16257/j.cnki.1681-1070.2019.1210

• 微电子制造与可靠性 • 上一篇    下一篇

高压大功率FRD用硅外延片厚度测量方法

潘文宾,黄宇程,王银海,杨帆   

  1. 南京国盛电子有限公司,南京 211111
  • 收稿日期:2019-09-09 出版日期:2019-12-20 发布日期:2019-12-24
  • 作者简介:潘文宾(1984—),男,江苏宝应人,西安电子科技大学硕士,工程师,现从事硅外延片量测管理工作。

Thickness Measurement of Silicon Epitaxial Wafer for High Voltage and High Power FRD

PAN Wenbin, HUANG Yucheng, WANG Yinhai, YANG Fan   

  1. Nanjing Guosheng Electronics CO., LTD., Nanjing 211111, China
  • Received:2019-09-09 Online:2019-12-20 Published:2019-12-24

摘要: 高压IGBT/FRD管(1200 V以上)用外延片外延厚度通常在100 μm以上,远超常规外延材料,使用傅里叶红外光谱法(FTIR)测量时,往往光谱center burst出现变异,对测量结果计算造成误差。实验分析不同因素对光谱的影响,同时确认重掺衬底条件下光谱正向峰型稳定规律,重新定义取值峰,采用正向峰值计算方法避免产生测试误差,提高测试稳定性。

关键词: 高速恢复二极管 , 硅外延, 厚层, FTIR, 光谱变异

Abstract: The epitaxial wafer for high voltage IGBT/FRD tube (above 1200V) is difficult to test because its epitaxial thickness is usually above 100 μm. Fourier transform infrared spectroscopy (FTIR) is often used to measure the thickness of epitaxy layer. The spectral center burst varies, which results in errors in the calculation of measurement results. The influence of different factors on the spectral variation is analyzed experimentally, and the stability of the forward peak shape is confirmed under the condition of heavily doped substrates. Therefore, it is necessary to redefine the peak value and adopt the forward peak calculation method to avoid the test error and improve the test stability.

Key words: fast recovery diode, silicon epitaxy, thick layer, FTIR, spectral variation

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