The semiconductor controlling electric power is called a power device, which is used for electric cars, for example.
For withstand voltage and heat resistance, gelatinous resin, such as a silicone resin gel, is used in power devices.
We have investigated the mechanism of the development of the electrical tree, which is generated in the gel when the high voltage is applied to the gel.
In our lab., you can observe the generation and development of the tree in the silicone gel using a high-speed camera and a 3-Dimensional digital microscope.