Aluminium corrosion in power semiconductor devices

LDMOS 材料科学 钝化 二极管 电气工程 晶体管 工程类 光电子学 电压 复合材料 图层(电子)
作者
Joonas Leppänen,J. Ingman,J.H.C. Peters,Michael Hanf,R. Ross,G. Koopmans,Joni Jormanainen,A. Forsström,Glenn Ross,Nando Kaminski,Vesa Vuorinen
出处
期刊:Microelectronics Reliability [Elsevier BV]
卷期号:137: 114766-114766 被引量:5
标识
DOI:10.1016/j.microrel.2022.114766
摘要

In this study, insulated gate bipolar transistor (IGBT) power modules were exposed to high voltage, high humidity, high temperature and reverse bias (HV-H3TRB) conditions until end-of-life (EoL). The limited lifetime of power semiconductor devices when used in demanding applications involving high relative humidity during operation is commonly reported to be associated with the design of the edge termination in power transistor or diode chips. A physics-of-failure (PoF) oriented methodology was adopted in failure analysis, including using lock-in thermography (LiT) for failure localisation and using an advanced microwave-induced plasma (MIP) decapsulation technique for the selective etching of the edge termination polyimide passivation film. A focused ion beam (FIB) was utilised to create a cross-section of the samples for both scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) analysis. The evidence gathered using the physics-of-failure methodology were compared with the results from advanced statistical analysis of the failure distributions in Weibull plots, including comparison of α and β parameters. This analysis revealed correlation with the Weibull distributions and the results from the physics-of-failure. Aluminium corrosion products were systematically observed on guard rings (GR) and field plates (FP) showing that the migration of these corrosion products forming an electrical path between the guard rings that seems to be a major failure mechanism in high humidity environments when reverse bias voltage is applied.
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