Can you point me to the physical limit? "Thermoelectric efficiency depends on the figure of merit, ZT. There is no theoretical upper limit to ZT, and as ZT app

Can you point me to the physical limit? "Thermoelectric efficiency depends on the figure of merit, ZT. There is no theoretical upper limit to ZT, and as ZT approaches infinity, the thermoelectric efficiency approaches the Carnot limit. However, no known thermoelectrics have a ZT>3."[1] There seem to be some in promising materials with a ZT of 2.2[2] which is around 20% similar to a solar cell. It seems again if more R&D where applied we might be able to make that cheap and practical. 1. https://en.wikipedia.org/wiki/Thermoelectric_materials#Device_efficiency https://en.wikipedia.org/wiki/Thermoelectric_materials#Devic... 2. https://newatlas.com/most-efficient-thermoelectric-material/24210/ https://newatlas.com/most-efficient-thermoelectric-material/...