Journal Article thermal conductivity thermoelectric materials Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. electrical conductivity thermoelectrics thermopower Cu2Se Published Erratum Review Schottky junction aerogels carbon nanotubes chalcogenides degenerate electronic bands electron and phonon critical scattering entropy high-throughput iodine doped Cu2Se mixed ionic-electronic conductors mosaic crystals multi-scale microstructures narrow-gap semiconductors non-cubic compounds non-equilibrium preparation phase transition power generation pseudocubic structures stable thermoelectric materials