Useful compendium. The thermodynamic efficiency issue with ALL TEGs is that it's governed by the temperature difference (akin to Carnot), which with semiconduc

Useful compendium. The thermodynamic efficiency issue with ALL TEGs is that it's governed by the temperature difference (akin to Carnot), which with semiconductor TEG materials is VERY LIMITED. Thus the efficiency and yields are going to be low grade because of this. This is also why RTGs with plutonium (e.g. Voyager) are the pinnacle and always will be. The best on Earth will also be nuclear powered for the same reasons nuclear is best for power and rockets: higher delta T possible.