What would be a better heatsink to buy, copper or aluminum? What does copper do that aluminum doesn't? I know it is more expensive and is heavier, so what is the advantage of copper?
EDIT: more detail about the application. I need a heatsink for a TEG peltier module, the cool side. The source of power is simply the heat of your hand, coming from the hot side. To prevent it from neutralizing both sides of the peltier, I'm using heatsinks to cool the other side. Therefore, I need the most powerful heatsink available so that the peltier will produce voltage longer.