Improved Electrically Insulating Properties of Modified Silicone Gel With Trifluoropropyl and Phenyl for IGBT Packaging
Meng Luo, Xiaolong Cao, Yuanhang Zhou, Ran Wang, Zhengdong Wang
Abstract
We reported that trifluoropropyl/phenyl was introduced into silicone gel to prepare a novel silicone gel with enhanced electrically insulating properties, and the influence mechanism of different side groups on the electrically insulating properties of silicone gel was analyzed by molecular simulation and experimental comparison. The results showed that silicone gel with only high-electron-affinity phenyl had the strongest breakdown strength, which was 32.87kV/mm. The introduction of strongly polarized trifluoropropyl resulted in the dielectric constant at the power frequency of silicone gel reaching 5.1673, which was 1.88 times that of pure silicone gel. More importantly, the dielectric constant at power frequency condition and the breakdown strength of the modified silicone gel with trifluoropropyl and phenyl simultaneously increased to 3.0725 and 29.42kV/mm, respectively. Meanwhile, it also exhibited excellent thermal stability. This work will provide important information for the development of novel silicone gel with high electrically insulating properties.