In a vertical BJT, why does the current flow vertically downward?
So the base surrounds the emitter, and the collector surrounds the base. Eventually the current will flow into the collector ohmic contact at the top. So why doesn't the current flow laterally towards the collector terminal? From what I read in textbooks, it takes the long way of going down vertically and then move its way across and up to the collector terminal. Being that we bias the base/collector/emitter at the top, then the strongest voltage would be at the top. And since we surround the emitter with base, and surround the base with collector, it seems current should be able to flow any direction, so why not take the shortest path and go straight across.