Popular Mechanics: Elon Musk should dig for GaN

"Navitas Semiconductor is one of many companies in the space looking to make an impact on the field of EV batteries. It says that by making a simple swap-gallium nitride (GaN) for silicon-EV batteries could shed critical weight and also charge faster. It's all because of the chemical and physical makeup of GaN compared with silicon, giving GaN larger capacity with less materials."