Dom,
Diodes are made from many materials, but silicone is not one of them.
a note of correctness: Silicone is a polymer used to make things slippery, as in a lubricant. Some adhesives are also made of silicone compounds. It is also the filling agent for implants used to enhance or replace certain body parts.
Silicon, element 14 on the periodic table, is an element that is plentiful here on Earth, and is used for many things, among them semiconductor devices such as transistors and diodes.
--rick chinn
