Thermoelectric performance of Cu_1−x−δAg_xInTe₂ diamond-like materials with a pseudocubic crystal structure

Abstract

In a tetragonal chalcopyrite solid solution Cu_1−xAg_xInTe₂ (<italic>x</italic> = 0–0.5), a pseudocubic structure is realized at <italic>x</italic> ≈ 0.2. The degenerate valence bands influence electrical transport and lattice thermal conductivity. The highest <italic>ZT</italic> of 1.24 was obtained at <italic>x</italic> = 0.2 and <italic>δ</italic> = 0.05.